CeO_(2)添加量对电弧增材制造铁基形状记忆合金组织和性能的影响  

Effect of CeO_(2)Addition on Microstructure and Properties of Iron-Based Shape Memory Alloys by Arc Additive Manufacturing

作　　者：尹小琴[1] 朱建 唐第东 王宏宇[1] 黄金雷 YIN Xiaoqin;ZHU Jian;TANG Didong;WANG Hongyu;HUANG Jinlei(School of Mechanical Engineering,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]江苏大学机械工程学院,镇江212013

出　　处：《机械工程材料》2024年第4期83-88,共6页Materials For Mechanical Engineering

摘　　要：采用粉芯丝材+电弧增材制造技术制备了含不同质量分数(0,1%,2%,3%)CeO_(2)的Fe-14Mn-6Si-9Cr-5Ni铁基形状记忆合金,研究了CeO_(2)添加量对试验合金显微组织和形状记忆性能的影响。结果表明:添加质量分数1%的CeO_(2)后,合金晶内析出相减少,晶界处析出较大尺寸的稀土化合物,组织均匀,弯曲变形后未出现ε马氏体跨晶生长现象,且马氏体交叉状态较少;当CeO_(2)质量分数增加至2%和3%时,晶内析出相增多,分布均匀性变差,且在弯曲变形后ε马氏体跨晶生长和交叉特征增多;随着CeO_(2)添加量增加,试验合金的晶粒尺寸减小,层错概率增大,形状回复率先增大后减小,当CeO_(2)质量分数为1%时晶粒尺寸较小,层错概率较大,形状回复率最大,形状记忆性能最好。Fe-14Mn-6Si-9Cr-5Ni iron-based shape memory alloys with different mass fractions(0,1%,2%,3%)of CeO_(2)were prepared by powder core wire+arc additive manufacturing technique,and the effects of CeO_(2)additions on the microstructure and shape memory properties of the alloy were studied.The results show that after adding 1 wt%CeO_(2),the precipitated phase in the alloy was reduced,the rare earth compounds in large size were precipitated at the grain boundary,and the microstructure was uniform.At this time,there were no transgranular growthεmartensite and a few crossing martensite were observed after bending deformation.When the mass fraction of CeO_(2)increased to 2%and 3%,the precipitated phase increased,and the distribution uniformity became worse.At this time,the transgranular growthεmartensites and crossing martensite increased after bending deformation.With the increase of CeO_(2)addition,the grain size of the test alloy decreased,the probability of stacking fault increased,and the shape recovery rate first increased and then decreased.When the CeO_(2)mass fraction was 1%,the grain size was relatively small,the probability of stacking fault was relatively large,and the shape recovery rate was the largest,the shape memory property was best.

关 键 词：铁基形状记忆合金 电弧增材制造 CeO_(2) 粉芯丝材 钉扎效应 

分 类 号：TG139.6[一般工业技术—材料科学与工程]