时效工艺对Fe-14Mn-5Si-8Cr-4Ni-0.2C合金形状记忆效应的影响  

Effect of aging technique on shape memory effect in Fe-14Mn-5Si-8Cr-4Ni-0.2Calloy

作　　者：李宁[1] 文玉华[1] 胥永刚[1] 涂铭旌[1] 李平全[2] 刘迎来[2] 

机构地区：[1]四川大学材料成形与控制工程系,四川成都610065 [2]西安石油管材研究所,陕西西安710065

出　　处：《功能材料》2002年第6期621-623,共3页Journal of Functional Materials

基　　金：四川省科委重点资助项目

摘　　要：研究了时效工艺对Fe 14Mn 5Si 8Cr 4Ni 0 .2C合金形状记忆效应和微观组织的影响 ,研究结果表明 :变形后再时效对合金形状记忆效应的提高比不变形直接时效的显著得多。变形后时效将合金的形状回复率提高了 190 % ,而直接时效只提高了 83 %。经SEM和TEM分析发现 :同样时效时间下 ,与直接时效相比 ,变形后再时效一方面不仅减少了碳化物的析出数量 ,抑制了碳化物粒子的长大 ;另一方面还使第二相粒子主要在晶界上析出 ,而不是在晶内。正是这两方面的原因导致变形后时效对合金形状记忆效应的提高比不变形直接时效的高得多。The effects of aging technique on the shape memory effect and the microstructure in Fe 14Mn 5Si 8Cr 4Ni 0.2C alloy have been studied. The results show that aging after deformation has a much more remarkable improvement in shape memory effect than through aging free deformation. The shape recovery ratio in Fe 14Mn 5Si 8Cr 4Ni 0.2C alloy can be increased by 190% through aging after deformation, while it can be only increased by 83% through aging free deformation. As compared with aging free deformation, SEM and TEM analysis show that aging after deformation reduces the amount of the second phase particles and suppresses its growth-up when the aging time is the same. What is more, it makes the second phase particles precipitate mainly in grain boundary, not inside grain. It was the above two reasons that make the improvement in shape memory effect through aging after deformation much more remarkable than through aging free deformation.

关 键 词：Fe-14Mn-5Si-8Cr-4Ni-0.2C合金 形状记忆合金 形状回复率 时效 变形 

分 类 号：TG139.6[一般工业技术—材料科学与工程]