TO IDENTIFY THE HEAT TREATMENT PROCESS PERFORMED ON A GIVEN SPECIMEN.

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

Sectioning and cutting

Mounting

Planner Grinding

Intermediate Polishing

Fine Polishing

1. Etching

Hardness TestObserving The Microstructure

Dual clamping.

Transparent shield.

Rack and penion.

Cooling system .

Lubricating Oil(29:1)

SPECIMEN

• To preserve the specimen• To have a good grip on the specimen for polishing

• 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

2.Mounting unit:•Mould cylinder•Mould plunger•Spacer•Heating/Cooling system•Thermostat •Clock alarm

Plunger

Cylinder

We used Backlite Powder for which :-

Working Temperature = 160°C to 170°C

Working Pressure = 130 kg/cm²

Working Time = 6 to 9 minutes

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

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

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

After etching specimen was then dried with dryer. Heater is used to dry the specimen

HEATER

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 .

ANY QUESTIONS ???