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Metal and Metallurgy engineering FAQ

stainless steel properties

What determines the stability of austenite? by mcguire
Posted: 31 Jul 02

Austenite in stainless steel is meta-stable. So, when it deformed, it transforms to the more stable phase, martensite. This transformation is a function of temperature and degree of deformation. The stability of the austenite is expressed as the temerature at which 30% deformation (uniaxial tension) produces 50% transformation.
It is related to composition in the following way:
Any alloy addition lowers the Md30 and stabilizes the austenite.

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