摘要
为了进一步提高Fe-15Mn-4.5Si-10Cr-5Ni系形状记忆合金的形状记忆效应,利用OM、TEM及物理相分析等试验方法,研究了直接时效及固溶+时效热处理工艺对试验合金微观组织、第二相析出及形状记忆效应的影响。结果表明,试验合金经固溶处理后,因第二相粒子大幅度回溶,导致试验合金形状记忆性能下降较为明显;同时,因直接时效处理较固溶+时效处理显著提高了试验合金中Cr碳化物第二相析出量,使试验合金形状记忆性能大幅度提升。其中,试验合金在800℃直接时效可获得最佳形状回复率。
Effects of direct aging, solution and aging heat treatment on the microstructure, precipitation of the second phase and shape memory effect of the tested alloy were studied by means of OM,TEM and physicochemical phase analysis in order to further improve the shape memory effect of Fe-15 Mn-4.5 Si-10 Cr-5 Ni shape memory alloy. The results show that, the shape memory performance of the specimen decreases obviously because the second phase particles redissolve greatly after solution heat treatment;At the same time, the direct aging treatment significantly increases the amount of Cr carbide second phase precipitation in the specimen compared with the solution and aging treatment, which greatly improves the shape memory performance of the specimen. The best shape recovery ultimately can be obtained by direct aging at 800 ℃.
作者
赵锴
杨忠民
李佳蕊
陈颖
曹燕光
李昭东
Zhao Kai;Yang Zhongmin;Li Jiarui;Chen Ying;Cao Yanguang;Li Zhaodong(Research Institute of Structural Steels,Central Iron and Steel Research Institute,Beijing 100081,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2021年第12期7-12,共6页
Heat Treatment of Metals
基金
国家重点研发计划(2017YFB0304700,2017YFB0304702)。
关键词
形状记忆合金
形状记忆效应
马氏体相变
第二相
时效热处理
shape memory alloy
shape memory effect
martensitic transformation
second phase
aging heat treatment
