CATALYTICAL KINETICS OF BUTTERFLY MARTENSITE

The stress fields around the first butterfly martensite in an Fe-Ni ba sed alloy were calculated. The calculation results inducate that there are tensile stress fields near the convexity and the two ends of a bu tterfly martensite. There is a compressive stress field near the conca vity. New butterfly martensite is likely induced not only near the con vexity but also probably near the concavity. The butterfly martensites induced in tensile stress fields are bigger than those in compressive stress fields. The second butterfly martensite is likely induced near the convexity within 2 mu m region. All these results agree with the experimental observation.