Chapt 8 Annealing - EMA4120 Physical Metallurgy I, Chapt 8...

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EMA4120 Physical Metallurgy I, Chapt 8 Annealing University of Florida, Dept. of Materials Science and Engineering EMA4120 Physical Metallurgy I Chapter 8: Annealing Paul Holloway 202 Rhines Hall 846-3330 pholl@mse.ufl.edu
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EMA4120 Physical Metallurgy I, Chapt 8 Annealing University of Florida, Dept. of Materials Science and Engineering Outline Cold working Stored energy Annealing Recovery Polygonization Kinetics Recrystallization Nucleation and growth S-shaped curves Recrystallization time and temperature %CW, initial grain size, Grain growth GB geometry Kinetics, impurities, inclusions, precipitates, preferred orientation Free surface, thermal grooving, limiting grain size, strain-induced Secondary recrystallization/secondary or abnormal grain growth
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EMA4120 Physical Metallurgy I, Chapt 8 Annealing University of Florida, Dept. of Materials Science and Engineering Microstructure After Cold Working Cu-5Zn %CW = 100(t i – t f )/t i Elongation of grains Same number of atoms/grain Low angle GB may increase by dynamic recovery
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EMA4120 Physical Metallurgy I, Chapt 8 Annealing University of Florida, Dept. of Materials Science and Engineering Hot Rolling
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EMA4120 Physical Metallurgy I, Chapt 8 Annealing University of Florida, Dept. of Materials Science and Engineering Definitions Cold working = plastic deformation of a metal at a temperature and rate such that recovery does not take place Warm working = plastic deformation of a metal at a temperature and rate such that recovery takes place, but recrystallization does not takes place Hot working = plastic deformation of a metal at a temperature and rate such that recrystallization takes place Annealing = heating a metal to a T for a t such that one or more of the following stages are observed: Recovery (static) Recrystallization Grain growth Secondary recrystallization/abnormal grain growth Annealing ≠ heat treatment
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EMA4120 Physical Metallurgy I, Chapt 8 Annealing University of Florida, Dept. of Materials Science and Engineering Annealing vs Microstructure
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EMA4120 Physical Metallurgy I, Chapt 8 Annealing University of Florida, Dept. of Materials Science and Engineering Energy Released by Annealing Differential scanning calorimetry-DSC-of electrolytic Cu Energy stored as strain energy in Cu ~1-7 cal/mole (4-30 J/mole) Fraction of total deformation energy ~15-5% G = H - T S = W
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EMA4120 Physical Metallurgy I, Chapt 8 Annealing University of Florida, Dept. of Materials Science and Engineering Driving Forces and Mechanisms for Annealing GB area ~ n v (4 π r 2 ) n v ~ (4 π r 3 /3) -1 GB energy ~ 3 γ /r
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University of Florida, Dept. of Materials Science and Engineering Effect of Annealing on Properties CW: ρ ↑, YS ↑, UTS ↑, %El↓ Recovery: ρ ↓, YS↓, UTS→, %El→ Recystallization: ρ ↓, YS↓, UTS↓, %El↑
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This note was uploaded on 11/16/2011 for the course MSE 4120 taught by Professor Holloway during the Fall '11 term at University of Florida.

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Chapt 8 Annealing - EMA4120 Physical Metallurgy I, Chapt 8...

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