C700R-1耐热合金700℃时效组织和性能演变  

Microstructure and mechanical properties evolution of heat resistant alloy C700R-1 after aging at 700℃

作　　者：田仲良[1] 姜森宝 陈正宗[1] 包汉生[1] 刘正东[1] 

机构地区：[1]钢铁研究总院特殊钢研究所,北京100081

出　　处：《钢铁研究学报》2016年第9期60-65,共6页Journal of Iron and Steel Research

基　　金：国家能源应用技术研究及工程示范资助项目(NY201501);国家高技术研究发展(863)计划资助项目(2012AA03A501)

摘　　要：研究了新型汽轮机转子用C700R-1耐热合金700℃长期时效组织和性能的演变。研究表明:合金的主要析出相为M23C6、MC、γ′。C700R-1合金长期时效组织结构稳定,时效5 000h晶界处M23C6碳化物平均宽度从190nm增加至240nm,呈不连续状态分布;时效5 000h球形γ′平均直径从22.0nm粗化至49.8nm,粗化速率缓慢。合金拉伸强度和硬度随时效时间延长先快速升高,后缓慢降低,并逐渐趋于稳定;理论计算C700R-1合金中γ′临界尺寸为29.8nm;长期时效后合金的冲击值在50J以上。The microstructure and mechanical properties evolution of a new developed turbine rotor alloy C700R-1 after long time aging at 700 ℃ were investigated. The results show that the main precipitates consist of M23C6, MC, and γ＇, and microstructure of this alloy remains stable after long time aging. M23 C6 carbides are distributed dis- continuously along grain boundaries, and the mean width of particles increase from 190 nm to 240 nm after aging at 700 ℃ for 5 000 h. The mean diameter of spherical γ＇ increases from 22.0 nm to 49.8 nm after aging at 700 ℃ for 5 000 h, indicating that its coarsening rate is relatively low. During aging, both of the tensile strength and hardness increase sharply, then decrease slowly and finally tend to be steady. The theoretical calculation results show that the critical diameter of γ＇ is 29.8 nm for C700R-1 alloy. The impact toughness of C700R-1 is higher than 50 J even after long time aging.

关 键 词：汽轮机转子 C700R-1耐热合金 组织演变 性能演变 

分 类 号：TG132.3[一般工业技术—材料科学与工程]