Additions Of Tin Also Improve Machinability Engineering Essay

Additions Of Tin Also Improve Machinability Engineering Essay

Aluminum is one of non-ferrous metal that widely in used in all industry and it was foremost produced in 1825. The oxidation of aluminium cause it become white or white grey visual aspect. In the most of abundant metallic component, doing up approximately 8 % of the earthi??s crust and it was produced in measure 2nd merely to that of Fe. The rule ore for aluminium is bauxite which is a hydrated ( water- containing ) aluminium oxide and includes assorted others oxides. The production procedure from bauxite to aluminum consumes a great trade of electricity which contributes significantly to the cost of aluminium. There were elements such as Cu, Ni, Mg, Sn, Si and Zn added into the aluminium to go aluminum metal to better the strength, hot hardness, hardness and fluidness [ Handbook of Manufacturing Engineering and Technology ] .

Now, aluminium metal become one of the most of import technology stuff in term of machinability, formability, weldability and castability. It can be spliting into shaped metals or cast metal. Aluminum Zn alloys represent a new household of zinc-based dice projecting stuffs that contain higher aluminium content than standard Zn metals. These metals provide high strength features plus high hardness and good bearing belongingss. Good dimensional stableness belongingss. Tin is effectual in bettering antifriction features and is hence utile in bearing applications. Projecting metals may incorporate up to 25 % Sn. Additions of Sn besides better machinability.


Presents, aluminum metal is widely usage in the universe. Aluminum metals are used extensively in edifice construction due to their high strength to burden ratio. But pure aluminium has really low strength and excessively soft for such utilizations. This non suited for edifice construction like other such as steel, unstained steel and etc. So we can reason that, if every mixture of metal can better the suitableness toward their applications.

We concern of this mixture because to look into how the Zn and Sn will give consequence on aluminium metal and we will cognize how the metal transform due this combination. From the old research, its prove the combination of aluminium with Zn and Sn was selected to prove and analyze.

This survey will look into the consequence of Zn and Sn atom add-on on the aluminium metal physical and mechanical belongingss. This survey will finish after bring forth the aluminium metal by utilizing CO2 projecting method in order to acquire the good physical and mechanical belongingss.

1.3 Aim

1. To analyze penetrate on the consequence of Zn and Sn atom on the mechanical belongingss of Aluminum Alloys affecting tensile and hardness trial.

2. To analyze the microstructure of aluminium after adding 3 % ,6 % ,9 % wt Zn and 0.5 % Sn.

3. To analyze the support of aluminum metal belongingss via add-on of Zn.

1.4 RESEARCH Question

1. What are the effects of Si and nickel atom on the mechanical belongingss of Sn-Zn aluminium metal affecting tensile and hardness trial?

2. What the effects on microstructure and mechanical belongingss after adding 3 % ,6 % ,9 % wt Zn and 0.5 % Sn?


1. Specimens used in this research are aluminum metal with added with debasing component Zn and Sn.

2. Testing involved are hardness and tensile trial. All testing is carried out in room temperature.

3. Testing involved are spectrometer trial, denseness trial, hardness trial, impact trial, tensile trial, XRD, and microstructure observation. All the proving carried out in room temperature.


1. This research will show the Sn-Zn microstructure feature in aluminum metal. This consequence can be used as mention to other research workers in order to do comparing with the bing metal.

2. In more apprehension of the microstructure analysis to the mechanical belongingss of the stuff. The apprehension of relation between microstructure analysis and mechanical belongingss from this research will give better thought for the following research to happen better belongingss of Sn-Zn aluminum metal.

3. To acquire the better mechanical belongingss of Sn-Zn aluminum metal. Then, the consequences from this research can assist the related industry such as automotive industry to happen the better stuffs with sensible monetary value for their fabrication.

Chapter II


2.1 Introduction

In this chapter, it ‘s will discourse about the term that use in this undertaking. It is include the theory and the diary of the research that found from the past researches. To finish this research, some of the resources besides obtain from magazines and old researches that make by senior pupil. Besides that, there are some illustrations of instance survey made by several research workers sing the productiveness betterment of the Aluminum metal. At theory subdivision, a treatment in item about aluminium Sn-Zn metal. For the past research subdivision, it will demo the past research diary that act as mentions. It contains the stuff they use, the procedure involved and besides the consequence for each experiment.

2.2 Theory

2.2.1 Aluminum Alloy

Aluminum is abundant component of 8 % on Earth crust and usually found in oxide signifiers ( Al2O3 ) , i.e. , bauxite, kaolinite, alunite, and nephelite, . White or white gray visual aspect of aluminium is cause by oxidization. In the most of abundant metallic component, doing up approximately 8 % of the earthi??s crust and it was produced in measure 2nd merely to that of Fe. The rule ore for aluminium is bauxite which is a hydrated ( water- containing ) aluminium oxide and includes assorted others oxides. The production procedure from bauxite to aluminum consumes a great trade of electricity which contributes significantly to the cost of aluminium. There were elements such as Cu, Ni, Mg, Si and Zn added into the aluminium to go aluminum metal to better the strength, hot hardness, hardness and fluidness.

2.2.3 Alloying Component Zinc

Nowadays Zinc based metals have been developed and quickly increasing in commercial value. Zinc alloys possess a alone combination of belongingss that permit rapid and economic casting of accurate constituent. Zinc is inexpensive debasing component over other alloy component. These alloys component exhibit mechanical belongingss equal or exceed those of aluminium, Cu metals, and dramatis personae Fe, . In add-on, it ‘s have first-class bearing belongingss, high strength due to composing, high hardness, and machinability. Another advantages include lower casting temperature, longer die life due to take down temperature and superior a-cast surface coating. It ‘s besides have good physical and mechanical belongingss at ambient but job may be cause by their low weirdo opposition. Zinc is silver white metal with comparatively low runing point ( 419.5i??C ) . When unalloyed, its strength and hardness is greater than that of Sn or lead but appreciably less than that of aluminium or Cu. Zinc is brittle at ordinary temperature but ductile above 100i??C. Tin

This silvery, ductile post-transition metal is non easy oxidized in air and is used to surface other metals to forestall corrosion. The first metal, used in big graduated table since 3000 BC, was bronze, an metal of Sn and Cu. After 600 BC pure metallic Sn was produced. Pewter, which is an metal of 85i??90 % Sn with the balance normally dwelling of Cu, Sb and lead, was used for flatware from the Bronze Age until the twentieth century. In modern times Sn is used in many metals ; most notably tin/lead soft solders, typically incorporating 60 % or more of Sn. Another big application for Sn is corrosion-resistant Sn plating of steel. Because of its low toxicity, tin-plated metal is besides used for nutrient packaging, giving the name to tin tins, which are made largely of steel.

2.2.4 Phase Diagram

Common constituents of a stage diagram are lines of equilibrium or stage boundaries, which refer to lines that grade conditions under which multiple stages can coexist at equilibrium. Phase passages occur along lines of equilibrium. Ternary points are points on stage diagrams where lines of equilibrium intersect. Ternary points mark conditions at which three different stages can coexist. For illustration, the H2O stage diagram has a ternary point matching to the individual temperature and force per unit area at which solid, liquid, and gaseous H2O can coexist in a stable equilibrium. The bezant is the temperature below which the substance is stable in the solid province. The liquidus is the temperature above which the substance is stable in a liquid province. There may be a spread between the bezant and liquidus ; within the spread, the substance consists of a mixture of crystals and liquid ( like a “ slurry ” ) . ( Jimmy Wales, 2011 )

Figure 2.1 Phase diagram ( liquidus projection )

2.2.4 TTT Diagram

T ( Time ) T ( Temperature ) T ( Transformation ) diagram is a secret plan of temperature versus the logarithm of clip for a steel metal of definite composing. It is used to find when transmutations begin and end for an isothermal ( changeless temperature ) heat intervention of a antecedently austenitized metal. When austenite is cooled easy to a temperature below LCT ( Lower Critical Temperature ) , the construction that is formed is Pearlite.

As the chilling rate additions, the pearlite transmutation temperature gets lower. The microstructure of the stuff is significantly altered as the chilling rate additions. By heating and chilling a series of samples, the history of the austenite transmutation may be recorded. TTT diagram indicates when a specific transmutation starts and terminals and it besides shows what per centum of transmutation of austenite at a peculiar temperature is achieved. Cooling rates in the order of increasing badness are achieved by slaking from elevated temperatures as follows: furnace chilling, air chilling, oil extinction, liquid salts, H2O extinction, and seawater. If these chilling curves are superimposed on the TTT diagram, the terminal merchandise construction and the clip required to finish the transmutation may be found.

Figure 2.2- TTT Diagram

2.3 Summary of past research

The a-Mg grain sizes of as-homogenized Mg-3Sn, Mg-7Sn and Mg-14Sn metals are 220, 160 and 93 i??m, severally and this indicates that the grain is evidently refined with increasing Sn content. Hot bulge can significantly polish the grain size of a-Mg stage, and the grain sizes of the three as-extruded Mg-Sn alloys lessening to 28, 3 and 16 i??m, severally. A small Mg2Sn stage can be observed in Mg-3Sn metal, but in Mg-7Sn metal much more little Mg2Sn atoms distribute uniformly in the a-Mg matrix. Large size Mg2Sn stage, inherited from hardening, exists in the Mg-14Sn metal, doing the grain polish less effectual. Tensile strengths of the three metals are evidently enhanced by bulge, and the ultimate tensile strength of the as-extruded Mg-7Sn metal is the highest, 255 MPa, increased by 120 % as compared with that of the as-cast one [ CHEN Dong, REN Yu-ping, GUO Yun, PEI Wen-li, ZHAO Hong-da, QIN Gao-wu ] .

By increasing the Sn content, the dendrites are less demarcated by intermetallics. The output strength of the as-cast metal additions with increasing Sn content, while the more Sn add-on reduces the ultimate tensile strength and ductileness due to the formations of big Mg2Sn atoms and uninterrupted stage along the grain boundaries. The tensile strength can be obviously improved by solution coupled with ageing interventions. The elderly Mgi??7Zni??5Ali??2Sn metal exhibits optimal tensile belongingss and heat opposition, where the ultimate tensile strength, output strength manus elongation at 150? C are 187 MPa, 148MPa and 3.3 % , severally [ Wenlong Xiao, ShushengJia, Lidong Wang, YaomingWub, Limin Wang ] .

Addition of a 3rd component can advance the mechanical and thermic belongings of Sni??9Zn solder metal in assorted ways. The liquescent temperature of Sni??9Zn eutectic solder metal decreases somewhat after the add-on of Al, this is due to the formation of close treble eutectic composing Sni??9Zni??05Al. The volume fraction of IMCs in both treble metal nucleates in contrast to that of the eutectic a-Zn stage, which decreased with increasing add-on of Al and Cu. At the same clip the eutectic a-Zn stage converts into all right needle-like constructions instead than thick rod-like gill. Again in the microstructures of freshly developed treble metals, some new stages are observed compared to Sni??9Zn eutectic solder metal. For the instance of Al add-on the new stage is compact molded precipitate of Al6Zn3Sn, while for the instance of Cu it is found to be flower and rod molded precipitate of Cu6Sn5 and Cu5Zn8 severally. The microhardness value increases for Al add-on in the eutectic Sni??9Znsolder metal. The tensile strength of Sni??9Zni??0.5Al is found to be higher compared to the Sni??9Zn eutectic solder metal ; on the other manus elongation drops a small. For the instance of Cu add-on both tensile strength and elongation beads. Sni??9Zn and Sni??9Zni??0.5Al alloys showed a malleable break form, while Sni??9Zni??0.5Cu metal showed a complex cleavage failure form. Finally, it can be concluded that the add-on of a small sum of Al in bettering the mechanical belongingss of Sni??9Zn eutectic solder metal is more effectual than that of Cu [ S.K. Das, A. Sharif, Y.C. Chana, N.B.Wong, W.K.C. Yung ] .

The Sn content was systemtically changed in the Mg-xSn-Al-Zn system and the microstructure and mechanical belongingss were investigated. From the observation, the undermentioned decisions can be drawn. Mg-xSn-Al-Zn metals chiefly composed of primary Mg matrix, Mg17Al12 and Mg2Sn stage, and the volume fraction of the Mg2Sn stage increased with the Sn concentration. The tensile strength and elongation decreased at room temperature increased with Sn concentration. As a effect, 5wt % Sn add-on was the one exhibiting the best tensile belongingss at room temperature. The microhardness of the metal continuously increased with increasing the Sn concentration. The pregnant chad and cleavage aspects were dominant mechanisms of these metals tested at room temperature and part of cleavage aspect was increased with the increase of Sn at

room temperature [ B.H. Kim, J.J. Jeon, K.C. Park, B.G. Park, Y.H. Park, I.M. Park ] .

Addition of 0.15 wt % Sn lowers the YS, UTS, and hardness somewhat and raises the ductileness and stamina of both as-cast B319.2 and A365.2 alloys. The Al-7 % Si-0.35 percentage Mg metal incorporating 0.05 wt % Sn has better mechanical belongingss compared to the metals holding Sn contents lower or higher than 0.05 wt % . This consequence may present a new Al-Si-Mg-Sn metal to the Al industry. Sing the add-on of Sn in A356.2 metal, the Mg2Si stage contains a significant sum of Sn which changes the composing of the stage to Mg2Si0.2Sn0.No inclusions of free Sn were observed in the Al-Si-Cu-Mg or Al-Si-Mg metals. Mechanical belongingss of heat-treated B319.2 and A356.2 metals decreased with increasing Sn content [ A.M.A. MOHAMED, F.H. SAMUEL, A.M. SAMUEL, H.W. DOTY, and S. VALTIERRA ] .

All right block-like ( Mg, Mn, Al ) -containing stage are formed uniformly in the Mg-Mn metal matrix. Small sum of fi Ne ( Mg, Zn ) -containing stages appear in the grains when proper sum of Zn content is added. As the Zn content additions, the sum of ( Mg, Zn ) -containing stages increases in the Mg-Mn-xZn metals. When the Zn content is 3wt % , ( Mg, Zn ) -containing stages precipitate near the grain boundary, and their sum, both in the matrix and at the grain boundary, increases consequently as the Zn content increases farther. Grain size polish can be achieved by adding proper sum of Zn in the Mg-Mn metal. As the Zn content additions, the microstructure of the metal will be refined. When the Zn content is 3wt % , grain size lessenings from 700-900 i??m to50-80 i??m. As the Zn content increases farther, the grain size can non be refined any more. Tensile strength, output strength and elongation are improved significantly by adding proper sum of Zn. When the Zn content is 3wt % , tensile strength, output strength and elongation can be enhanced by about 130 MPa, 40 MPa and100 % , severally. As the Zn content increases farther, tensile strength and elongation lessening somewhat, while the output strength about remain unchanged. The Mg-Mn metal shows cleavage fracture behaviour. Tearing ridges appear when proper sum of Zn is added, nevertheless, the lacrimation phenomenon will be enhanced by farther adding Zn. When the Zn content exceeds 3wt % , big sum of ( Mg, Zn ) incorporating stages appear on the break surface, and act as cleft beginnings [ Yin Dongsong, Zhang Erlin and Zeng Songyan ] .

In this survey, we understand which composing will give best consequence for best tensile and hardness strength.

Chapter III


3.1 Introduction

For the overall undertaking, for guarantee the full activities are executing expeditiously, a consistently programming was planned. These experimental surveies will be divided into five chief phases as below:

I. Literature reappraisal

two. Sample readying

three. Heat intervention

four. Laboratory plants

v. Result and informations analysis

six. Report composing and certification

The research methodological analysis flow chart is shown as figure 3.2 and the Gantt chart for the whole survey is shown as figure 3.3

3.2 Flowchart

3.2.1 Literature reappraisal

The undertaking was started by happening for beginnings such as diaries, articles from cyberspace, mentions books and old pupil concluding undertaking thesis to steer us in research. This reviews were chief is about how the research will be carried on and the composing of alloys elements that being done before. All of these reappraisals will assist us for a better apprehension of the procedures and all the proving to be done in this research.

3.2.2 Sample readying

Mould and pattern readying

The mold made up by Silica sand. The form that usage is made by the wood. The form was built with diameter dimension of 30mm in solid cylindrical form. The form consists of two parts which are header and retarding force. One form can bring forth two samples at one pouring. Eleven molds were produced per session to execute the casting procedure.


The furnace had been preheated before the stuffs were put into the furnace. Then, the stuff was arranged in the furnace until it full before the coking procedure of the stuff. The composing stuff is to the full melted at temperature 710i??C. After the full stuffs melted, the liquefied metal poured into the molds. After a few hours, the stuff had been cold and so the cast can be brake.

3.2.3 Laboratory Works Spectrometer Test

The spectrometer trial is conducted after the pouring and readying of specimen complete, which is taking the specimen to find the per centum of element composing of alloyed aluminium itself. A specimen consist of 0.5 % wt Sn added with 3 % , 6 % , and 9 % wt Zn. The specimen will be sparked three times in on different point by utilizing Optical Emission Spectrometer ( OES-5500 ) . Hardness Test

This trial conducted to acquire and measure the hardness value of all samples. The Rockwell trial method been implemented for intent where the trial stuff been indenting by hardened steel ball indenter. The experiment is carried out with 5X indents at different surfaces country. The norm of the reading was taken to happen the precise value. The full hardness trial is utilizing HRB graduated table unit. At least 3 samples were tested for each trial and merely mean values are reported. Tensile Trial

The trial procedure involves puting the trial specimen in the testing machine and using tenseness to it until it fractures. The elongation measuring is used to cipher the technology strain, e.Samples for tensile proving were prepared as per ASTM criterion B 557-02a. At least 3 samples were tested for each trial and merely mean values are reported. Density Test

The trial is conducted to happen out and mensurate the denseness of the new alloyed ductile Fe. The trials are performed by taking the weight of the stuff in air and the weight of the stuff in H2O and so cipher the denseness of the sample through Archimedes method. At least 3 samples were tested for each trial and merely mean values are reported. Microstructure Analysis

For the microstructure analysis, the specimens are observed by utilizing Olympus BX 41M microscope to measure the microstructure construction of the specimen. These specimens will be analyzed before and after and after etching with 2 % Nital. The specimen need to be grinded and polished foremost before the analysis procedure. The magnification and lighting was adjusted until a clear position was appeared. 50X, 100X, and 200X magnification were conducted to detect the microstructure of the specimen. XRD

X-ray diffraction ( XRD ) is a versatile, non-destructive technique that reveals elaborate information about the chemical composing and crystallographic construction of natural and manufactured stuffs. Impact Test

The Charpy impact trial is a standardised high strain-rate trial which determines the sum of energy absorbed by a stuff during break. The specimens were determined as per ASTM criterion ASTM E23. At least 3 samples were tested for each trial and merely mean values are reported.

3.2.4 Result and Data Analysis

After all testing had been completed, all the information from the experiments will be analyzed. The proper analysis is done to carry through all the aims of this research. Data analyzing is referred to the standard specification such as ASTM criterion to obtain the better determination from the information and consequence. After all done, decision will be carried out.

3.2.5 Report Writing and Documentation

Document all the plants done from initial phase to last phase and do as the concluding study.

3.3 Gantt Chart

Chapter IV


4.1 Introduction

The experimental set-up and process for specimen readying and testing procedures are explained in the undermentioned subdivision below. All machine and instrument usage must be set harmonizing to the specifications provided by the manufacturer.The experiment processs need to be explored and identified measure by measure and be explained clearly through the whole procedures. All machine and equipments below are available in Mechanical Engineering Laboratory UiTM Shah Alam. All of the procedure and proving that will be done must be supervised by technician.

4.2 Mould Preparation

The ingredients of sand consist of Silica sand ( 50kg ) , H2O ( 1 % ) and sodium silicate ( 10 % ) . Silica sand is pour into sand sociable machine and run the machine until 15 proceedingss. Water is add into machine and go forth for 3 proceedingss. After that, Na silicate is pour into machine and go forth for 15 proceedingss. Make the mold for specimen, sand mixture are so compacted into the form ( header and retarding force ) and pressed exhaustively utilizing the rammer. Wires are topographic point in retarding force form in order to do certain the cast foundation is non break. After the sand mixtures are to the full compacted, holes are made with 3/4 deepness of pattern tallness. Carbon dioxide gasses were so sedimentation inside the holes for 10s for every hole and to do certain the sand mixtures are hardened wholly. After the mixtures are to the full hardened, it is so taken out from the form. The cast is so coated utilizing sand coating and burned to obtained smoother surface.

4.3 Melting Procedure

The thaw procedure is the phase where the Aluminum Zn-Sn metal has been produced where the component of Aluminum Zn-Sn metal being melted together and poured into the mold to bring forth the specimen. The component of Aluminum Zn-Sn metal is Aluminum, Zinc, and Tin. First, Aluminum is melt in furnace. Second, add 3 % ,6 % and 9 % wt Zn and 0.5 % wt Sn into furnace The stuffs are so heated until it reached its thaw temperature runing from 710i??C in an initiation furnace. Thermocouple is usage to bespeak the tapping temperature of the liquefied dramatis personae before pouring procedure take topographic point. Treated alloyed aluminium is so poured into the cast. It is so allow cooled and solidified at room temperature.

Figure 4.1- Induction Furnace

Machine Specification

Furnace type: Initiation Furnace

Furnace capacity: 5 kilogram

Melting temperature: 710 i??C

Ladle type: Hand ladle

Ladle capacity: 5- 20 kilogram

Machine power: 600 Kw

4.4 Spectrometer Test

The spectrometer trial is conducted in order to find the chemical composing of the aluminium that will utilize as a specimen. Spectrometer cast and scoop are foremost coated and so fire by gas. Molten aluminium is so scoop and so pours into the cast. The cast is so interruption and the sample are taken out of the cast. The sample is so iciness in oil extinction procedure and lower surface of the sample undergo crunching procedure to obtain smoother surface. The sample is so tested to obtain the composings. The sample was topographic point on the base of spectrometer machine and closed the cap. Then, the machine would be sparked the surface of the sample. The composing of the sample is interpreted by the computing machine. The readings that were obtained must be print out by the bing pressman.

Figure 4.2- Spectro Analytical Instrument

Machine Specification

Name: Spectro Analytical Instrument

Model: MAXx LMF 14

Gas used: Argon

Power: 400VA

Input signal: 115/230 VAC, 50/60 Hertz

4.6 Hardness Test

The portable Hardness examiner was used to mensurate the opposition of the sample to lasting indentation. The Rockwell hardness is used and the specifications were as stated below.

Figure 4.4- Portable Rockwell Hardness Test

Machine specification

Apparatus name: Rockwell Hardness Tester

Type of Indenter: Ball

Scale: HRB

4.7 Density Test

The denseness trial is conducted to find the denseness of the specimen. It is utilizing density trial machine to obtain the weight of the specimen in two conditions that are the weight on air and the weight on H2O. These consequences are so being applied in the expression to get the denseness of the specimen. Since the equipment is really sensitive with quiver. The level and stable surface are required and do certain all the door of the machine closed to avoid perturbation stableness of weighing machine to guarantee an accurate reading by the machine. On the machine by switched on the chief power. Then reset the machine to guarantee the reading was zero and wait for a few second to guarantee the machine in truly stable status. The sample is weighted in air with the door of machine closed. After that the same sample is weighted in H2O with the door of machine besides closed. The specimen is taken out from machine and off the machine by switched off the chief power.

Density = Weight on air ten Density of H2O

( Weight on air i?? Weight in H2O )

*Density of H2O is 0.99730g/cm3

Figure 4.5- Analytic Balance Machine ( GR-200 )

Machine specification

Apparatus name: Analytic Balance Machine ( GR-200 )

Consecutive No. : 14210152

Maximal burden: 210 g

Weighing status: In air and to the full immersed in H2O

4.8 Impact Test

The specimen was machining into required form for impact trial by utilizing milling machine. The specifications followed the ASTM criterion of proving. The specimen was of serrate type harmonizing to ASTM A 327 criterion and dimension. At the centre of the specimen, notching in 2mm length and 45i?? form was created. All trials were carried out at room temperature. Before the trial was conducted, do certain the safety lock on the machine is locked. The impact trial is conducted to find the sum of energy of the specimen. First, adjust the reading arrow with arrow bearer to 300 J. Raise the cock by custodies and latch in. Let go of the cock by runing lever, the arrow will so bespeak the energy loss due to clash, the cock manually and latching. Place specimen on the specimen support touching terminal halt. The specimen should be placed in such a manner that the notch is opposite to the way of impact of the pendulum. Remove the broken specimen from the machine and convey reading arrow on 300J dial marker. Put the pendulum back to the original place and safety lock.

Figure 4.6- Pendulum Impact Testing Machine

Machine Specification

Name: Pendulum Impact Testing Machine

Model: IT 30

Max energy of pendulum: 300 Js

Distance between support: 40 m i?? 0.2mm

Type: Izod and charpy

4.9 Tensile Trial

The specimen is machining into the needed form for tensile trial by utilizing lathe machine. Tensile proving was performed following ASTM B557 criterion and dimension of the specimen and iti??s performed at room temperature. Tensile trial will be tested by utilizing INSTRON 3382 Digital Control. The tensile trial is conducted to find the physical belongingss of the specimen such as maximal burden, emphasis, strain and elongation of the specimen. The machine sample is first topographic point in between the lower jaw and clasp steadfastly. All parametric quantities are inserted and the upper jaw will grip the samples. The force applied will draw the sample until the sample is break into halve. The sample is taken out. At least 3 samples will be tested and mean values will be showing the tensile strength and elongation of the samples. Open the jaw clasp manually and take out the specimen. Then, the machine and computing machine was switched off.

Figure 4.6- Tensometer Tensile Testing Machine

Machine specification

Name: Tensometer Tensile Testing Machine

Major Load: 100 KN

Name Model: Instron 3382

Name Software: InstronBluehill

4.10 Microstructure Analysis

The microstructure analysis is conduct to detect and analyze the microstructure of the specimen. First, utilizing Buehler Abrasimet2 scratchy cutter machine the sample will cut into little piece. The little piece of the sample is topographic point on the machine with needed surface to be analysis is topographic point at the underside of the surface of the machine. Run the machine where it takes about 15 proceedingss to finish the procedure. After 15 proceedingss, the concluding merchandise was wholly mounted. The sample is first swot utilizing Metaserv 2000 Grinder Machine get downing from grade 180 for the coarsest to rate 1200 for the finest surface. It is so Polish get downing from 900, 600, and 300i??m to obtain reflecting Polish surface. After that, etching procedure is behavior. This is to guarantee that clearer observation is obtained. The sample is so observed utilizing Olympus BX41M microscope.

Figure 4.7- Metaserv 2000 Grinder Machine

Figure 4.8- Olympus B X 41M microscope

Machine specification

1. Apparatus name: Metaserv 2000 Grinder Machine

Sand paper class: 120, 240, 320, 480, 600, 800 and 1200

Minimal velocity: 50 r.p.m

Maximal velocity: 500 r.p.m

Electrical supply: 100V-240V

Polishing substance: Diamond Paste

2. Apparatus name: Olimbos B X 41M microscope

Personal computer theoretical account: Dell

Magnification: 50x, 100x, and 200x

Software: IMAPS ver 4.0 Profesional Edition

4.11 XRD ( X-Ray Diffraction )

X-ray diffraction ( XRD ) analysis was performed to gauge the austenite content and the per centum of C in austenite. XRD was done utilizing a monochromatic Cu K? radiation at 40 kilovolts and 100 ma. 10mm long sample was prepared and put in XRD machine to analysis. Salvage the consequence and analysis the consequence.

Machine specification

Name: Rigaku X-Ray diffractometer

D/M at 2200V/PC

Model: Ultima IV

Personal computer theoretical account: Dell