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Heat treatment - Coggle Diagram
Heat treatment
annealing
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stress relieve anneal
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reduce entanglement, gain ductility
full anneal
heat to form austenite, hold for some time and cool slowly
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increase ductiliy, reduce hardness
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quenching
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form martensite, increase hardness for required function
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tempering
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3 types
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martempering
for oil, air hardenable, and thin section water hardenable
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normalizing
heat to T (55C - 85C above critical T), hold for time, cool
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refine grain, improve machinability