Abstract
In this study, the isothermal martensitic transformation has been examined in an austenitic Fe–Ni–Cr alloy. The magnetic properties of the austenite phase are investigated with Mössbauer spectroscopy and the results showed that the Fe-32%Ni-0.4%Cr alloy in the austenite state is magnetically ordered. In the austenite state, the six peaks of the ferromagnetic phase of Fe-32%Ni-0.4%Cr alloy were observed in the Mössbauer spectrum. The effective hyperfine field of the ferromagnetic (or antiferromagnetic) austenite phase was determined as 31.9 T and the isomer shift value was determined as −0.19 mm/s. We also investigated the austenite–martensite phase transformation observed upon cooling in the Fe–Ni–Cr alloy by scanning electron microscopy (SEM).
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