Austenite Stabilization of Fe-Ni Alloy

By X-ray powder diffraction and magnetometric methods we investigated the effect of phase hardening during γ-α-γ transitions.In this case austenite becomes more stable to subsequent γ-α-γ transitions, the dislocation density increases, the grain reduce in fragments and the hardness increases, too.In addition, the γ-solid solution in some steels is unstable during ageing.The phase hardening was found to stabifize the γ-solid solution of Fe-Ni alloy to subsequent thermal treatment.This is consistent with an increase in carbon mobility after γ-α-γ transitions.Tlat is why decarbonizations of austenite iake place during increase in extent of phase hardening. .