冷变形对FeMnSiCrNi合金形状恢复率和转变温度的影响

通过Fe16Mn6Si7Cr7Ni合金变形量的大小和形变的类型来研究马氏体的转变特征.形变类型及变形量为:冷轧13%～28%;拉伸4%～17%.并通过热膨胀法测量合金相转变起始温度和转变终了温度,合金的相组成和微观结构特征通过XRD、SEM获得.研究结果表明:冷变形过程均会导致合金的形状恢复率降低,导致应力诱发ε、α/马氏体的形成,并使热马氏体的帆低于室温.

Influence of Cold Deformation on Shape Recovery Ratio and Transformation Temperature of FeMnSiCrNi Shape Memory alloys

The characteristics of martensitic transformation in Fe16Mn6Si7Cr7Ni alloy were investigated by the amount and type of deformation: 13% to 28% cold rolling, and 4% to 17% elongation. The starting and finishing transformation temperature of the alloys was measured by dilatometry method. The constitution and microstrueture of the alloys were characterized by X-ray diffraction, scanning electron microscopy. The results show that cold forming processes decrease the shape recovery ratio and induce the formation of ε and α/ martensitic, and make the starting transformation temperature of thermal martensitic below room temperature.