# Hardness Tests and Charpy Impact Test

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Hardness Tests and Charpy Impact Test Objectives: 1) To compare the hardness between mild steel, carbon steel through Vickers Hardness Test. 2) To compare the hardness between High Quality Carbon Steel and ASSAB steel through Rockwell Hardness Test. 3) To compare the hardness between carbon steel and mild steel through Brinell Hardness Test. 4) To study the differences between mild steel and carbon steel upon Charpy Impact Test. Introduction: Hardness is a measure of the resistance of a metal to permanent (plastic) deformation. The hardness of a metal is measured by forcing an indenter into its surface. The indenter material, which is usually a ball, pyramid, or cone, is made of a material much harder than the material…show more content…
13) Step 1 to 6 is repeated for two times for the same sample but at different portion of the sample. 14) Step 1 to 7 is repeated for another sample of carbon steel. Result: Hardness Test A. Vickers Hardness Test Carbon Steel | Reading | d1 | d2 | Average | VHN | 1 | 306.7 | 296.1 | 301.4 | 204 | 2 | 301.1 | 300.7 | 300.9 | 205 | 3 | 321.5 | 319.6 | 320.55 | 180 | 4 | 324.5 | 328.7 | 326.6 | 180 | 5 | 321.6 | 317.0 | 319.3 | 182 | Average | 190.2 | Mild Steel | Reading | d1 | d2 | Average | VHN | 1 | 325.3 | 327.3 | 326.3 | 174 | 2 | 356.1 | 353.0 | 354.55 | 147 | 3 | 323.1 | 320.8 | 321.95 | 179 | 4 | 325.6 | 325.3 | 325.45 | 175 | 5 | 334.1 | 328.1 | 331.1 | 169 | Average | 168.8 | B. Rockwell Hardness Test High Carbon Steel | Reading | HRC | HV | 1. | 28.0 | 286.0 | 2. | 27.6 | 283.2 | 3. | 31.7 | 315.6 | 4. | 25.7 | 271.4 | 5. | 24.3 | 261.8 | Average | 27.46 | 283.6 | ASSAB | Reading | HRC | HV | 1. | 57.2 | 637 | 2. | 57.1 | 635 | 3. | 57.5 | 643 | 4. | 57.1 | 635 | 5. | 57.3 | 639 | Average | 57.24 | 637.8 | C. Brinell Hardness Test Mild Steel | Reading | Diameter (mm) | BHN | 1. | 3.2 | 121 | 2. | 3.3 | 114 | 3. | 3.2 | 121 | Average | 3.23 | 118.67 | Carbon Steel | Reading | Diameter (mm) | BHN | 1. | 2.7 | 171 | 2. | 2.7 | 171 | 3. | 2.7 | 171 | Average | 2.7 | 171 | Charpy