Abstract
The influence of prior deformation on reverse martensitic transformation temperature in Fe-high Ni alloys has been investigated by several workers. For example, Pope has studied the reverse transformation temperature of an Fe-30%Ni alloy with respect to deformation, and found that the start temperature of reverse transformation (A{sub s}) increased continuously with increasing deformation. Mel'nikov et al. have examined the variation in A{sub s} with deformation temperature in an Fe-30%Ni alloy, and reported that the deformation at ambient temperature shifted the A{sub s} to higher temperature, while deformation applied between 60 and 100 C lowered the A{sub s}. The above investigation dealt only with the A{sub s} of lenticular martensite having partially twinned substructure, but few studies have been made on lath martensite with highly dislocated substructure of an Fe-Ni alloy. In the present study, lath martensite of an Fe-15%Ni and lenticular martensite of an Fe-31%Ni alloy were prepared, and the variation in A{sub s} with prior deformation at room temperature was investigated and compared with each other.
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