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Cold Rolling

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Submitted By rjrobinjindal
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MCP 232 Lab Report
Aim: To study the work hardening change in hardness in cold rolling operation
Material: Low carbon steel
Method of Test: 1. Rolling Treatment 2. Indentation Hardness test
Observations:
Rolling Treatment
Least Count of micrometer= 0.001mm
Specimen 1
Thickness= 2+ 48x0.001= 2.048mm S.No. | F1 (kN) | F2 (kN) | Total Force (kN) | 1. | 14 | 12.02 | 26.02 | 2. | 15.55 | 16.02 | 31.57 | * 5% reduction in each pass * Total thickness reduction= 10%
Specimen 2
Thickness= 1.85mm S.No. | F1 (kN) | F2 (kN) | Total Force (kN) | 1. | 18.7 | 19.5 | 38.2 | 2. | 19.3 | 19.48 | 38.78 | 3. | 20.36 | 20.36 | 40.72 | * 5% reduction in each pass * Total thickness reduction= 15%

Specimen 3
Thickness= 1.5+ 44x0.001= 1.544mm S.No. | F1 (kN) | F2 (kN) | Total Force (kN) | 1. | 20.9 | 20.6 | 41.5 | 2. | 20.8 | 20.64 | 41.44 | 3. | 20.04 | 20.33 | 40.37 | 4. | 21.7 | 21.96 | 43.66 | 5. | 21.03 | 20.34 | 41.37 | * 3% reduction in each pass * Total thickness reduction= 15%

Specimen 4
Thickness= 1.4+0.006=1.406mm

Indentation Hardness test
Indentation Force=20N
Specimen 1: I. 154HV II. 157HV III. 157HV Average Hardness= 157 HV
Specimen 2: I. 162HV II. 160HV III. 159HV Average Hardness= 160.33 HV
Specimen 1: I. 169HV II. 174HV III. 174HV Average Hardness= 172.33 HV
Specimen 1: I. 184HV II. 183HV III. 181HV Average Hardness= 182.66 HV

Conclusion:
We observed that- * As we deform the material hardness increases. * Metals harden due to deformation at room temperature (cold working). * Grain boundaries, impurities, precipitates act as barriers or obstacles to the movement of dislocations. Dislocations get piled up at the grain boundaries. * To overcome the barriers and cause continuous plastic flow, higher energy is required. So the stress required to cause further plastic flow increases. * As a result the strength and hardness increase with increase in strain.

Submitted By: Rahee Hardaha 2013ME20794 Ocima Kamboj 2013ME20788 Pratyusha Sharma 2013ME20793
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