Fe-Mn-Si合金循环变形中马氏体相变和应变疲劳特性Martensitic transformation during cyclic deformation and strain fatigue characteristics of Fe-Mn-Si alloy
林成新,王桂新,王金刚
摘要(Abstract)：
用X射线衍射分析、扫描电镜观察以及应变疲劳试验研究表明,Fe-Mn-Si形状记忆合金在承受正负交变应力作用时,可相应地发生应力诱发γε马氏体相变及其逆相变。Fe-Mn-Si形状记忆合金循环变形过程中的应力诱发γε马氏体相变及其逆相变能降低应力集中,抑制塑性滑移变形,减少疲劳裂纹的形成和扩展,使合金具有较高的应变疲劳强度。其弯曲疲劳断口类呈脆性断裂。Fe-17Mn-5Si-10Cr-5Ni试验合金在应变幅值为±1.5%下的应变疲劳寿命达1300次,是U71Mn轨钢和1Cr18Ni9Ti不锈钢的10倍左右。
关键词(KeyWords)： Fe-Mn-Si形状记忆合金;ε马氏体相变;应变疲劳性能
基金项目(Foundation): 河北省自然科学基金项目(503038);; 河北省教委博士基金(B2004404)
作者(Author): 林成新,王桂新,王金刚
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