Fe-28Mn-6Si-5Cr SMA 应力诱发马氏体逆转变的热循环研究(英文)

A Thermal Cycle Experiment Study on the Reverse Transformation Behavior of Stress Induced Martensite in Fe 28Mn 6Si 5Cr SMA

研究了预应变量３％的Ｆｅ２８Ｍｎ６Ｓｉ５ＣｒＳＭＡ形状恢复量及应力诱发ε马氏体随温度的变化，结果表明部分应力诱发ε马氏体在４５０℃回火后不能恢复。

The change of recovery strain and the volume fraction of stress induced ε martensite as a function of temperature for Fe 28Mn 6Si 5Cr SMA prestrained by 3% was investigated by dilatometric and X ray diffraction. It suggest that part of stress induced ε martensite can not be transformed after heated at 450℃. The cycle curve showed that the internal elastic stress in prestrained FeMnSiCr SMA result in the different between constract rate and expansion rate when heated at same temperature range.