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Heat Treatment of Metals - THERMALPROCESSINGOF Annealing...

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Heat Treatment of Metals
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Annealing : Heat to T anneal , then cool slowly. Types of Annealing Process Anneal : Negate effect of cold working by (recovery/ recrystallization) Stress Relief : Reduce stress caused by: -plastic deformation -nonuniform cooling -phase transform. Normalize (steels): Deform steel with large grains, then normalize to make grains small. Full Anneal (steels): Make soft steels for good forming by heating to get γ , then cool in furnace to get coarse P. Spheroidize (steels): Make very soft steels for good machining. Heat just below T E & hold for 15-25h. Based on discussion in Section 11.7, Callister 6e . THERMAL PROCESSING OF  METALS
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Ability to form martensite Jominy end quench test to measure hardenability. Hardness versus distance from the quenched end. 24°C water specimen (heated to γ phase field) flat ground 4” 1” Hardness, HRC Distance from quenched end Adapted from Fig. 11.10, Callister 6e . (Fig. 11.10 adapted from A.G. Guy, Essentials of Materials Science , McGraw-Hill Book Company, New York, 1978.) Adapted from Fig. 11.11, Callister 6e . HARDENABILITY--STEELS
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The cooling rate varies with position.
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