The effect of austenite prestrain above the Md temperature on the martensitic transformation in Fe-Ni-Cr-C alloys |
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Authors: | J R Strife M J Carr G S Ansell |
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Affiliation: | (1) Central Scientific Laboratory, Union Carbide Corporation, 10591 Tarrytown, NY;(2) Rockwell International, 80401 Golden, CO;(3) School of Engineering, Rensselaer Polytechnic Institute, 12180 Troy, NY |
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Abstract: | The effect of austenite prestrain above theM
d
temperature on the structure and transformation kinetics of the martensitic transformation observed on cooling was determined
for a series of Fe-Ni-Cr-C alloys. The alloys exhibited a shift in martensite morphology in the nondeformed state from twinned
plate to lath while theM
s
temperature, carbon content, and austenite grain size were constant. The transformation behavior was observed over the temperature
range 0 to -196°C as a function of tensile prestrains performed above theM
d
temperature. A range of prestrains from 5 pct to 45 pct was investigated. It is concluded that the response of a given alloy
to austenite prestrain above theM
d
temperature can be correlated with the morphology of the martensite observed in the nondeformed, as-quenched state. For the
range of prestrains investigated, the transformation of austenite to lath martensite is much more susceptible to stabilization
by austenite prestrain above theM
d
temperature than is the transformation of austenite to plate martensite. |
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Keywords: | |
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