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Trip steels have a microstructure with retained austenite, ferrite and martensite .
The ability of steel to form martensite on quenching is referred to as the hardenability.
With hardening of steels, by chilling after previous heating, the structure is converted from austenite to martensite .
The martensite of quenched tool steel is exceedingly brittle and highly stressed.
During this heat treatment all of the austenite transforms to martensite .
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