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Old 06-03-2006, 02:44 AM
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Shade Tree Welder Shade Tree Welder is offline
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Default Martensite Transformation and Retained Austenite (One Minute Mentor)

I have been getting these emails from ASM International.

Quote:
June 2, 2006

The martensite start temperature (Ms), the temperature at which austenite begins to transform to martensite, decreases significantly with increasing carbon content in Fe-C alloys and carbon steels. The martensite finish temperature (Mf), or temperature at which the martensite transformation is complete in a given alloy, also is a function of carbon content, and drops below room temperature in alloys containing more than about 0.3% carbon. Therefore, significant amounts of untransformed austenite, especially in high-carbon steels, may be present with martensite at room temperature. Even in alloys containing only 0.3 to 0.4% carbon, some small amount of austenite is retained. Alloying elements that stabilize austenite increase the amount of retained austenite at any given carbon level and temperature.
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