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Effect of Austenite Pre-deformation on Isothermal Martensite Transformation in an Fe-20.5Ni-4.8Mn Alloy

Fuxing YIN , Jianxin ZHANG and Nanju GU(Hebei Institute of Technology , Tianjin , 300132 , China)Tsukio Tadaki(Institute of Science and Industrial Research , Osaka University , Japan)Ken , ichi Shimizu(Kanazawa Institute of Technology , Ishigawa 921 , Japan)

材料科学技术（英文）

With electron microscopy the investigation on isothermal martensite transformation in an Fe20.5Ni-4.8Mn alloy has been carried out to clarify the effect of austenite state on the transformation, by applying pre-deformation to austenite before isothermal holding. Under the condition without pre-deformation, the isothermal martensite products are lath martensite with {111}fhabit planes. Dislocations in austenite seem to contribute to nucleation of martensite, and in this nascent Stage austenite substructure has no obvious effect on martensite growth. The consequent thickening of martensite laths is apparently influenced by local austenite states, resulting in the changes in orientation, morphology as well as substructure of martensite lath. The kinetics of isothermal martensite transformation is controlled by intedece dislocation determined nucleation of martensite in primary stage, but to a larger extent, by the austenite accommodation for the shape strain of martensite in the thickening Stage

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Electron Microscopy Analysis of Deformation Induced ε Martensite Transformation in an Fe-Mn-Si-Cr-Ni Alloy

Fuxing YIN , Jianxin ZHANG , Ruixiang WANG and Nanju GU (Hebei Institute of Technology , Tianjin , 300132 , China)(To whom correspondence should be addressed)Kenichi Shimizu (Kanazawa Institute of Technology , Ishikawa , Japan)

材料科学技术（英文）

The configurations of stacking faults and morphologies of strain induced ε martensite plates in an FeMnSiCrNi alloy were investigated through electron microscopy analysis. The Shockley partial dislocation structures. sensitive to external stress. determine the configurations of stacking faults in γphase Partial dislocations at the front sides of stacking faults are usetul for the nucleation of εmartensite plates. The growth of ε martensite plates is accompanied with the disappearance of local pre-existing stacking faults, The ε martensite vanants behave in three morphologies of respective stopping. continuous penetrating and intersections with the formation of secondary ε martensite plates

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