Fe-Mn-Si-Cr-Ni-C系形状记忆合金时效效果的研究  

Study of aging effect in Fe-Mn-Si-Cr-Ni-C shape memory alloys

作　　者：文玉华[1] 李宁[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624-625,共2页Journal of Functional Materials

基　　金：四川省科委重点资助项目 (川科委计 [1 9999] 9)

摘　　要：通过SEM分析 ,研究了时效后不同成分Fe Mn Si Cr Ni C系记忆合金形状记忆效应和微观组织。在 112 3K时效时 ,超低碳合金 1的形状回复率随时效时间的增加一直呈直线上升的趋势。含碳 0 .18%合金 2的形状回复率随时效时间的增加而增加 ,在 3 0 0min达到最大值后将随时间的进一步增加而缓慢下降。SEM分析发现在合金 2的晶界和晶内析出富铬 ,富锰和富硅的合金碳化物 ,而合金 1仅在晶界有第二相析出 ,且第二相成分不同于合金 2中的。合金 2中第二相粒子的长大速度显著高于合金 1中第二相粒子的长大速度 ,且数量也多得多 ;通过时效强化奥氏体基体 ,可显著提高合金的形状记忆效应。The shape memory effect and the microstructure in Fe Mn Si Cr Ni C shape memory alloys after aging have been studied by SEM analysis. The shape recovery ratio in the alloy 1 with ultralow carbon contnet increases with increasing the aging time when aged at 1123K. The shape recovery ratio in alloy 2 with 0.18% carbon content increases with increasing aging time when the aging time is less than 300min, and a maximum value can be obtained at 300min. When greater than 300min, it will decrease gradually. The SEM analysis shows that the second phase particles precipitated both in grain boundary and inside grain of alloy 2, and these particles were carbides rich in chromium, manganese and silicon. While the second phase particles in alloy 1 precipitated only in grain boundary,whose composition is also different from that of alloy 2. The amount of the second phase particles in alloy 2 is much more than that in alloy 1. What is more, the growth velocity of the second phase particles in alloy 2 is also much faster than that in alloy 1. The shape memory effect in the tested alloy can be improved appreciably through strengthening austenite matrix by aging.

关 键 词：Fe-Mn-Si-Cr-Ni-C系形状记忆合金 时效 形状回复率 

分 类 号：TG139.6[一般工业技术—材料科学与工程]