Mst - Introduction Purpose of this lab session is to test...

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Introduction Purpose of this lab session is to test effect of heat treatment over mechanical properties of materials by applying different cooling rates to various types of steel and see the effect of cooling rate and composition on the final hardness. Theoritical Information Heat treatment involves heating and cooling operations in the solid state in order to obtain desired mechanical properties in materials. As mechanical properties are directly related to microstructure, phase transformaitons during heat treatment must be controlled very well. Slow cooling rates yield stable phases at room temperature (obeying equilibrium phase diagrams) while fast cooling rates may form metastable phases (not present in phase diagrams). Fe-C Equilibrium Phase Diagram In Equilibrium; when steel is cooled very slowly, phases obey the equilibrium and thus mechanical properties are dependent on carbon content only and every phase can be seen at its equilibrium temperature. However, in Non-Equilibrium cooling, microstructure at high temperatures can be frozen and
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This note was uploaded on 12/27/2011 for the course MATH 286 taught by Professor Adad during the Spring '11 term at Middle East Technical University.

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Mst - Introduction Purpose of this lab session is to test...

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