Abstract: The Hot deformation and martensitic transformation behaviors of Fe-32%Ni alloy was investi?鄄gated by measurements of electrical resistance and X-ray diffraction. With the increase in strain, the austenite goes through from the work-hardened to the partial dynamically re-crystallized and then to the completed dynamically re-crystallized. The martensitic transformation characteristics depend on the austenite states. The work-hardening in small strain is helpful to martensitic transfor?鄄mation due to the low dislocation density and little lattice distortion, while the high dislocation den?鄄sity and severe lattice distortion by the increase in strain will hinder the martensitic nucleation. Once dynamic re-crystallization (DRX) takes place, the martensitic transformation will be enhanced again, which is related to the heterogeneous dynamic substructures. The growing DRX grain can enhance the martensitic nucleation due to the low dislocation density near its grain boundary.

Key words: Fe-32%Ni alloy, hot deformation, work hardening