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- Normalized (air cooled) specimen has less proeutectoid ferrite in it since cooling rate is faster and there is not enough time to diffusion. Therefore, there is more pearlite and it is finer than annealed specimen. As a result, normalized specimen is harder than annealed specimen. - Oil quenched and water quenched specimens has martensite in their structure. Martensite is formed when diffusion does not occur. Namely, oil quenching and water quenching are the fastest processes. But oil quenching is slower than water quenching. Therefore, small amount of pearlite can be seen in it. For these reasons, oil quenched is harder than annealed and normalized specimens but softer than water quenched specimen. As a result, water quenched is the hardest specimen. - The hardness values of AISI 1060 specimens that I have found in the experiment confirm that when cooling rate increases the hardness increases. 4. The pearlite amount determines the hardness of a furnace cooled specimen. If carbon
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This note was uploaded on 12/27/2011 for the course MATH 256 taught by Professor Adad during the Spring '11 term at Middle East Technical University.

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