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This document discusses microstructure and heat treatment of steels. It begins by defining hardening and tempering as processes used to provide steels with suitable mechanical properties for their intended applications. Hardening involves heating steel to high temperatures then rapidly cooling, followed by tempering at lower temperatures to develop final properties and relieve stresses. Almost all engineering steels containing over 0.3% carbon can be hardened and tempered. The document discusses various microstructures that can form, such as martensite, and includes several diagrams illustrating microstructural changes. It also outlines some potential problems that can arise from hardening and tempering like distortion, cracking, scaling and decarburization.Read less

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