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E45 Lab4 - Recovery Recrystallization and Grain Growth E45...

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Recovery, Recrystallization and Grain Growth E45 Lab 4
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Definitions Annealing - heat treatment (2 main variables?) Cold Working - plastically deform by working with hammer or rollers, etc. Grain - single crystal (bcc, fcc) Microscopic view Macroscopic view Unstable grain boundary
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Process Microstructure Properties
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Heat Treating ε ε σ σ Heat treatment of cold worked material Different material properties can be obtained by varying the treatments applied to the material, i.e. the rates and magnitudes of heating, cooling, and working the material.
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1. Process: Cold Working with Rollers A 0 A f Initial: Random Grain Order Final: Organized Grain Structure (Elongated in direction of rolling) %CW =(A f - A 0 )/A 0 * 100
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2. Microstructure Initial: Random Grain Order Final: Organized Grain Structure (Elongated in direction of rolling) 1. Increased Energy Increased Instability 2. Increased Defects 3. Properties 1. Increased Hardness Increased # Defects 2. Increased Ultimate tensile strength
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Generalized effect of cold working on UTS/Hardness UTS Hardness % Cold Working
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