handout-2-heatTreatment_Jan9-13

handout-2-heatTreatment_Jan9-13 - Some Issues on Heat...

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Handouts 2 1 Some Issues on Heat treatment 1. Introduction The key to improve the material property is to change its structure at atomic level. This can be achieved through (i) alloying and controlled heat and cooling basically – heat treatment The basic steps of heat treatment are: Heat -> Soaking -> Cooling
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Handouts 2 2 Some Issues on Heat treatment Heat -> Soaking -> Cooling Temperature Time of soaking Rate of cooling Medium of cooling - Different combinations of the above parameters - Different compositions of materials and initial phases of materials Different heat treatments
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Handouts 2 3 Some Issues on Heat treatment 2. Purpose of heat treatment (1)Soften the metal prior to shaping; (2)Relieve the effects of strain hardening that occurs during cold forming; (3)Achieve the final strength and hardness required in the finished product as one of the end manufacturing processes.
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Handouts 2 4 Some Issues on Heat treatment Heat treatment Body heat treatment Surface heat treatment 3. Classification of heat treatment processes (1) annealing, (2) martensite formation in steel, (3) precipitation hardening, (4) surface hardening
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Handouts 2 5 Some Issues on Heat treatment 4. Annealing Heat -> Soaking -> Cooling - Reduce hardness and brittleness - Alter microstructure for desired mechanical properties - Soften metals to improve formability - Recrystalize cold worked (strain hardened) metals - Relieve stress from shaping
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Handouts 2 6 Some Issues on Heat treatment 4. Annealing Full annealing Normalizing Process Anneal - Recrystallization anneal - Recovery Anneal Stress-relief annealing
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handout-2-heatTreatment_Jan9-13 - Some Issues on Heat...

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