Microstructure of martensite in chromium-nickel steel
The structure of the martensite in steel of the transition type depends on the conditions under which it was produced: when martensite results from treatment at −70°C there is a predominance of plate-like crystals containing twins. Cooling from high temperature tempering, leads to the formation of needle-like crystals alone without any sign of internal twinning.
The ultimate strength and the yield strength of martensite formed as the result of treatment at −70° are higher.
Stacking defects may be areas of preferential nucleation of martensite crystals and at the same time limit the growth of martensite crystals.
KeywordsMicrostructure Martensite Yield Strength Time Limit Ultimate Strength
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