Isothermal martensitic transformation in Fe-Ni and Fe-Ni-C alloys at subzero temperatures |
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| Authors: | C A V de A Rodrigues C Prioul L Hyspecka |
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| Affiliation: | (1) Laboratoire Matériaux, Ecole Centrale des Arts et Manufactures, 92290 Chatenay-Malabry, France;(2) Research Institute Vitkovice Steel Works, Ostrava, Czechoslovakia;(3) Czechoslovakia |
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| Abstract: | A survey of experimental work on the isothermal martensitic transformation in the presence of prior martensite is given in
Fe-Ni and Fe-Ni-C alloys having subzero Ms (Mb) temperatures. Low temperature dilatometric measurements are correlated with
internal friction measurements in the 5 to 200 K temperature range. This study will show that this transformation can be discussed
in terms ofC-curve behavior as in Fe-Ni-Mn alloys. Nevertheless, in Fe-Ni and Fe-Ni-C alloys internal stresses created by the austenite-to-martensite
transformation during cooling play an important part in the development of the isothermal transformation. Furthermore, internal
friction is shown to be proportional to expansivity thus indicating that the internal friction technique can be applied successfully
for the study of phase transformations. |
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