2 hüs_rapor..

2 hüs_rapor.. - PROPERTY CONTROL BY...

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PROPERTY CONTROL BY HEAT TREATMENT Objective: To apply different cooling rates to various type of steels and to see the effect of cooling rate and steel composition on final hardness values. Apparatus: - A muffle furnace. - A hardness indenter. - A water tank. Sample Used: - 4 AISI 1060 steel bar. (The chemical composition: 0.6 %C) a. Furnace cooled. b. Air cooled. c. Oil quenched. d. Water quenched. - A furnace cooled AISI 1020 steel bar. (The chemical composition: 0.2 %C) - An air cooled AISI H13 high alloy steel bar. 1. The chemical composition of AISI H13 tool steel: - 0.35 % Carbon. - 1.00 % Vanadium. - 5.00 % Chromium. - 1.50 % Molybdenum. 2. Sample-1 Furnace cooled AISI 1020 Rockwell scale type B Sample-2 Furnace cooled AISI 1060 Rockwell scale type B Sample-3 Air cooled AISI 1060 Rockwell scale type C Sample-4 Oil quenched AISI 1060 Rockwell scale type C Sample-5 Water quenched AISI 1060 Rockwell scale type C Sample-6 Air cooled H13 Rockwell scale type C 1 2 3 4 5 Average Brinell Vickers Sample-1 65 65 60 60 63 63 112 112 Sample-2 94 95 93 96 94 94 210 210
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Sample-3 25 25 25 26 24 25 253 266 Sample-4 55 57.5 60 60 62 59 634 674 Sample-5 64 65 64 63 705 772 Sample-6 38 38 42 42 41 40 371 391 3. Temp(C ° ) 800 700 600 500 400 300 200 100 1 10 10 2 10 3 10 4 10 5 Time(s) - Due to equilibrium conditions satisfied annealed (furnace cooled) specimen has proeutectoid ferrite and pearlite in its microstructure. There is enough time to diffusion because annealing is the slowest cooling process. By this way proeutectoid ferrite and pearlite forms. The pearlite is coarse due to slow cooling rate. In addition, because of having proeutectoid ferrite
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2 hüs_rapor.. - PROPERTY CONTROL BY...

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