摘要
在LTES700R基础上发展了一种新型镍基耐热合金,并研究了该改进合金700℃时效后的组织与力学性能。结果表明:合金热处理后主要析出相为γ'、TiC、M_(23)C_6;在5000 h时效过程中合金组织结构稳定,Cr_(23)C_6在晶界处不连续分布,γ'粗化不明显;合金硬度随时效时间的延长先增加后缓慢降低。改进合金的室温和高温拉伸强度略低于LTES700R合金,长期时效的冲击韧性大于Nimonic263,晶界处不连续分布的碳化物增加合金晶界结合力,提高改进合金冲击韧性。
A new heat resistant alloy based on LTES700 R was developed,and microstructure and mechanical properties of the tested alloy after aging at 700 ℃ were investigated.The results show that the mainly precipitates of the alloy after heat treatment are γ＇,Ti C and M23C6 phases.After aging for 5000 h,the alloy exhibits good microstructure stability.Discontinuous M23C6 carbides are homogeneously distribution in grain boundaries,and coarsening behavior of γ＇ precipitates is not obvious.The hardness of the alloy increases and then decreases with aging time increasing.The tensile strength of the alloy at room temperature and high temperature is lower than that of LTES700 R alloy,but the new alloy shows more superior impact toughness than that of Nimonic263 alloy after aging.The discontinuous distribution of carbides along grain boundary（GB） can be beneficial to the improvement of GB cohesion and result in higher impact toughness of the alloy after aging.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2016年第8期78-83,共6页
Transactions of Materials and Heat Treatment
基金
国家高技术研究发展(863)计划(2012AA03A501)
国家能源应用技术研究及工程示范项目(NY20150101)
关键词
耐热合金
析出相
硬度
冲击韧性
heat resistant alloy
precipitate
hardness
impact toughness
