Effect of Prior Deformation on the Martensitic Transformation Temperature(Ms) and Reversed Martensitic Transformation Temperature(As) in Fe-Ni Alloy

Fe-Ni합금(合金)의 마르텐사이트변태온도(變態溫度)(Ms)와 역변태온도(逆變態溫度)(As)에 미치는 소성가공(塑性加工)의 영향(影響)

This research has been performed in order to investigate the effect of prior deformation on the Ms temperature and reversed As of Fe-Ni alloy. The Ms temperature rose with increment of strain to 30% but lowered over 50%. It can be analysed that martensitic transformation was promoted by partial dislocation in low strain, but suppressed by dislocation cell structures in high strain. The As temperature was substantially increased with higher deformation to 20% but slowly above 50%. It may be caused that as the transition bands formed by deformation constrained shear strain, therefore austenitic transformation was hindered.