论文部分内容阅读
采用OM、TEM和XRD方法研究了不同退火温度的热机械处理对Fe-14Mn-5Si-8Cr-4Ni合金中α′马氏体逆转变及合金形状记忆效应的影响。结果表明:当在773～1173 K之间退火时,Fe-14Mn-5Si-8Cr-4Ni合金的形状回复率随退火温度的升高先增加后降低,在923 K达到最大值88%;当退火温度低于923 K时,变形引入的α′马氏体仍大量残留在奥氏体基体中;当退火温度高于1073 K时,α′马氏体消失;热机械处理引入的α′马氏体能有效阻止再次变形过程中不同方向和不同区域应力诱发ε马氏体的交叉碰撞,使应力诱发马氏体以区域化的方式形成,进而显著提高合金的形状记忆效应。
The effects of thermomechanical treatment with different annealing temperature on the transformation of α ’martensitic transformation and shape memory effect in Fe-14Mn-5Si-8Cr-4Ni alloy were investigated by OM, TEM and XRD. The results show that the shape recovery rate of Fe-14Mn-5Si-8Cr-4Ni alloy first increases and then decreases with the increase of annealing temperature and reaches the maximum of 88% at 923 K when annealed between 773 and 1173 K. When annealed When the temperature is lower than 923 K, the α ’martensite introduced by the deformation still remains largely in the austenite matrix; α’ martensite disappears when the annealing temperature is higher than 1073 K; α ’martensite introduced by thermo-mechanical treatment The body can effectively prevent cross-collision of stress-induced ε-martensite in different directions and different regions in the process of reformation, so that the stress-induced martensite is formed in a regionalized manner, thereby significantly improving the shape memory effect of the alloy.