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High Quality Hardening Requires High Quenching Rates

2022-11-22



The best toughness is achieved when the steel is martensitically hardened (high quench rate;
cooling curve 1)


• If the cooling rate required for martensitic transformation cannot be achieved, the steel undergoes
bainitic transformation. The achievable toughness is lower (cooling curve 3).


• At very slow cooling, the steel transforms into the pearlitic state: (cooling curve 4) very low
toughness.



Resource: Kind&Co

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