Download - study the macroscopic properties of steel
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TO IDENTIFY THE HEAT TREATMENT PROCESS PERFORMED ON A GIVEN SPECIMEN.
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Observing the microstructure Identifying the H.T process Perform Hardness Test on specimen
Observing the microstructure Identifying the H.T process Perform Hardness Test on specimen
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Sectioning and cutting
Mounting
Planner Grinding
Intermediate Polishing
Fine Polishing
1. Etching
Hardness TestObserving The Microstructure
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Dual clamping.
Transparent shield.
Rack and penion.
Cooling system .
Lubricating Oil(29:1)
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SPECIMEN
• To preserve the specimen• To have a good grip on the specimen for polishing
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• MOUNTING PRESS:1.Hydraulic unit:•Hand pump•Quick release valve•Pressure gauge•Cross head beam
Cross head beam
Hydraulic jack handle
Pressure gauge
Time set
Quick release valve
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2.Mounting unit:•Mould cylinder•Mould plunger•Spacer•Heating/Cooling system•Thermostat •Clock alarm
Plunger
Cylinder
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We used Backlite Powder for which :-
Working Temperature = 160°C to 170°C
Working Pressure = 130 kg/cm²
Working Time = 6 to 9 minutes
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To decrease the depth of scratch as a result of sectioning.Course grit abrasive is used ( SiC paper )Wet and Pressure grinding is used
The angle must be changed upto 45 degree after each successive 4-5mins
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To make the surface shinny It wont remove the scratches Diamond paste was used along with an oil A radial to and fro motion was given to the specimen to make it mirror like
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To increase the optical behavior of micro-structural featureImprove the grain size and visibility of phasesEtching is done by an echant known as Nital solutionRegent attacks selectively on the specimen
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After etching specimen was then dried with dryer. Heater is used to dry the specimen
HEATER
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OUR SPECIMEN IS ANNEALED During Planner grinding & intermediate
polishing , scratch removal was quite easy. The specimen is soft Refined grain structure More Ferrite grains & less pearlite grains .
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ANY QUESTIONS ???