Abstract
For the purpose of clarifying the mechanism of the often reported reduction in the austenite lattice parameter due to the martensitic transformation, the lattice parameters of an Fe-32Ni alloy prepared by different cooling rates from the austenitization temperature have been measured in the states before and after the martensitic transformation. From the measurements made, the stress levels have also been calculated for both states. In the slowly cooled stress-free specimen no significant change in the lattice parameter was found after the martensitic transformation, which is in agreement with the theoretical prediction, whereas in the quenched specimens, in which quenching stress is present, an appreciable reduction in the parameter was found. The latter is accounted for by stress relaxation due to the martensitic transformation.
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