Analization Of Heat Treated Specimen

Background And Objective

A steel rod specimen was given.A heat treatment process was done

on it.

OBJETIVE is to workout the specimen and analyze the heat treatment process.

Road Map Documentation. Sectioning and cutting. Mounting. Planar grinding. Rough & Fine polishing. Final polishing. Etching. Microscopic analysis. Hardness Testing.

Cutting And Sectioning

Cut-Off Wheel# Two Motors# 30 Liters Storage Tank

Water and well cut oil 30: 1 ratio was used as coolant

The cut off wheel used was high carbon wheel ( Type A 120 N).

Jaws for holding specimen (work with rack and pinion gear).

Cut Off Machine

MOUNTING/PRESRERVATIONThe process was done with Mounting

Press.

Mounting Press# Hydraulic Unit#Mold Unit

Thermo plastic and Thermosetting resins are used for mounting.

Working Condition for Bakelite

Temperature 160 -170Ċ.Pressure 130 Kg/cm².Time 6 – 9 minutes.

FINAL RESULT

Mounting Press

Grinding And Polishing

Planer Grinding

Done with help of GRINDING WHEELSAbbrasive Material Bounded

Abbrasive Coiled AbbrasiveGrit Size 40 To 150 Mesh 180 To 300 Mesh

Planar Grinding

During the process the specimen was rotated by 45@ to 90@ after 5 minutes.

The rotation was done to reduce scratches.

The time taken by planar grinding was 4o minutes.

Polishing

ETCHING

Washing and Drying

After etching specimen was washed with water.

Then dried was dryer.These processes are done to make the

specimen ready for micro examinationThis is done to make specimen

completely pure from impurities.

Microscopic Analysis And comparison

Done with ELECTRIC MICROSCOPE

Comparison with standard specimens revealed the result that

The given specimen is

ANNEALED

Hardness Testing

Hardness The resistance offered by a material to

applied load against surface penetration, fracture, aberration and scratches

Categories of hardness test•Elastic hardness•Resistance to cutting and abbression•Resistance to indentation

Vicker hardness test

This test is performed by vicker hardness testing machine.

The load range is between 200g to 500g.The instrument uses a squre based diamond

pyramid indentor.The least count of scale is 10 micron. Hardness of the material is calculated by

following expression. HV=1854.4P/d^2

Micro Vicker

Hardness Testing Machine

Conclusion

AN

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QU

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