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9-Elevated Temp & Fracture

9-Elevated Temp & Fracture - ELEVATED TEMPERATURE...

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ELEVATED TEMPERATURE EFFECTS ANNEALING Heating a cold worked material to increase ductility which lowers strength.
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Large Sheet Metal Coil Annealing Furnace ANNEALING MECHANISM Recovery Recrystallization Grain Growth
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RECOVERY Internal stresses are relieved Sufficient thermal energy is supplied to allow the dislocations to rearrange themselves into lower energy configurations - polygonization. Dislocation Rearrangement Creates Boundaries
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RECRYSTALLIZATION At higher temperatures and longer times, new strain free grains are nucleated in the recovered structure and begin to grow forming a recrystallized structure. Recrystallization of Cold Worked Metals
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Recrystallization Kinetics in Al Structure-Property Relationship via Annealing
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Figure 6.6 FACTORS AFFECTING RECRYSTALLIZATION 1. Prior deformation 2. Temperature 3. Time 4. Initial grain size 5. Alloy composition
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GRAIN GROWTH Grains grow in order to reduce surface energy in the structure. Higher temperatures and longer times increase grain size until equilibrium size is reached.
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