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

作　　者：林成新[1] 王桂新[2] 王金刚[3] 

机构地区：[1]大连海事大学机电与材料工程学院,辽宁大连116026 [2]河北工业大学材料科学与工程学院,天津300130 [3]河北工业大学机械工程学院,天津300130

出　　处：《材料热处理学报》2007年第5期62-65,共4页Transactions of Materials and Heat Treatment

基　　金：河北省自然科学基金项目(503038);河北省教委博士基金(B2004404)

摘　　要：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γε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γε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。With XRD analysis, SEM observation and strain fatigue test, it is found that the γ←→ε martensitic transformation and its reverse transformation occur in Fe-Mn-Si shape memory alloy under alternate stress. The repetitive stress induced γ←→ε martensitic transformation and its reverse transformation in Fe-Mn-Si shape memory alloy with the cyclic deformation can increase fatigue life of the alloy by reducing stress concentration, restraining plastic sliding deformation and delaying the formation and growing of microcracks. The bending-fatigue fractured section in Fe-Mn-Si alloy shows brittle fracture.The strain fatigue life of the Fe-17Mn-10Cr-SSi-4Ni alloy with a strain amplitude of ± 1.5% is 1300 cycles, which is about 10 times more than that of U71Mn steel and 1Crl8Ni9Ti steel.

关 键 词：Fe—Mn—Si形状记忆合金 Ε马氏体相变 应变疲劳性能 

分 类 号：TG139.6[一般工业技术—材料科学与工程] TG113[金属学及工艺—合金]