Fe-Mn-Si合金不同变形条件的应力松弛特性  

Stress relaxation characteristics of Fe-Mn-Si alloy under different deformation conditions

作　　者：刘林林[1] 宋春雨[1] 林成新[2] 潘丽萍[1] 

机构地区：[1]大连交通大学机械工程学院,辽宁大连116028 [2]大连海事大学机械系,辽宁大连116026

出　　处：《材料热处理学报》2014年第3期40-44,共5页Transactions of Materials and Heat Treatment

摘　　要：采用X射线衍射、透射电镜观察研究了Fe-17Mn-5Si-10Cr-5Ni合金恒应变约束时，拉伸停载过程中应力诱发8马氏体相变的特点及其应力松弛特性。研究表明，恒应变约束状态下停载10min可以有效提高合金的应力诱发S马氏体数量；恒应变停载0—5min时，Fe—Mn-Si记忆合金应力松弛率随时间急剧上升，5min之后，松弛率增加变缓，表明应力诱发γ→ε马氏体相变主要在前5min内完成；热。机械训练既提高Fe-Mn-Si记忆合金形状记忆效应，又降低合金的应力松弛率，在实际工程应用时应予以考虑。The stress induced ε martensite transformation and stress relaxation characteristics of Fe-17Mn-SSi-10Cr-SNi shape memory alloy with different deformation conditions were studied by XRD and TEM. The results show that the amount of the stress induced martensite could be effectively increased when the suspending loading time in the range of 0 - 10 min. The stress relaxation rate rapidly increased when the suspending loading time was less than 5 min, then the stress relaxation rate increased slowly after 5 min, which indicated that the stress inducedγ→ε martensite transformation was mainly completed within 5 min. The shape memory effect of Fe-Mn- Si alloy was improved by thermo-mechanlcal training, at the same time, the stress relaxation rate was declined. The characteristics of Fe- Mn-Si alloy should be considered when it is applied in practical engineering.

关 键 词：Fe—Mn-Si合金 马氏体相变 应力松弛 

分 类 号：TG139[一般工业技术—材料科学与工程]