摘要
以混合动力车电池用Ni-18Fe-16Cr合金为研究对象,通过Mo合金化和热处理的方法,考察了固溶、中间热处理和时效热处理对Ni-18Fe-16Cr合金组织与性能的影响,并探讨了其作用机理。结果表明,随着固溶时间的延长,Ni-18Fe-16Cr合金中的析出相体积分数逐渐降低,而枝晶二次臂距逐渐增加;中间热处理后合金中的枝晶偏析进一步得到消除,且随着中间热处理时间的延长或者温度的提高,消除枝晶偏析的效果越好、晶界或析出相愈发不明显;955℃中间处理1 h和985℃中间处理1 h的晶粒尺寸相当,且都小于985℃中间处理1.5 h的晶粒尺寸;Ni-18Fe-16Cr合金适宜的热处理工艺为:固溶1 015℃/1.5 h+985℃/1 h中间热处理+675℃/18 h时效处理,热处理后都为空冷。
Taking Ni-18Fe-16Cr alloy as research object, through Mo alloying and heat treatment method, the effect of solid solution, intermediate heat treatment and aging heat treatment on the microstructure and properties of Ni-18Fe-16Cr alloy was studied, and the mechanism of its action was explored. The results show that, prolonging the solution time, the volume of precipitated phase in Ni-18Fe-16Cr alloy decreases gradually, while the dendrite arm spacing increases. The dendrite segregation in the alloy after intermediate heat treatment is further eliminated, and with the increase of heat treatment temperature or the prolong of time, the eliminating effect of dendrite segregation is better, and the grain boundary precipitates and crystal segregation are less obvious. The suitable heat treatment process of Ni-18Fe-16Cr alloy is the solid solution at 1 015℃ for 1.5 h ＋ the intermediate heat treatment at 985℃ for 18 h ＋ the aging treatment at 675℃ for 1 h, and followed cooling in air.
出处
《铸造技术》
北大核心
2017年第7期1574-1577,1580,共5页
Foundry Technology
