新型耐热合金C-HRA-3高温时效γ'相长大动力学  

γ' phase growth kinetics during high-temperature aging of new heat resistant alloy C-HRA-3

作　　者：陈正宗[1] 刘正东[1] CHEN Zhengzong;LIU Zhengdong(Research Institute for Special Steels,Central Iron and Steel Research Institute Co.,Ltd.,Beijing 1ooo81,China)

机构地区：[1]钢铁研究总院有限公司特殊钢研究院,北京100081

出　　处：《钢铁研究学报》2024年第12期1592-1598,共7页Journal of Iron and Steel Research

基　　金：国家重点研发计划资助项目(2017YFB0305203)。

摘　　要：针对C-HRA-3耐热合金在700和750℃时效后的试样研究了γ'相形貌、尺寸随时效温度和时间变化规律,推导γ'相长大动力学,并尝试预测10^(5)h时γ'相尺寸。结果表明:C-HRA-3合金在700℃长时时效11023h后,γ'相呈球形均匀分布,750℃长时时效11023h后,γ'相尺寸增大,形状由球形到部分呈近似球形。随时效时间和温度增加,γ'相尺寸逐渐增大,时效温度影响更显著。获得了C-HRA-3合金中γ'相在700和750℃时效后的长大动力学方程,计算γ'相长大有效激活能D_(Eff)为260k J/mol,预测γ'相700℃时效至10^(5)h时平均直径约140nm,750℃时效至10^(5)h时平均直径约230nm。Changes in the morphology and size of the γ' phase of C-HRA-3 heat-resistant alloy after aging at 700 and 750℃ with respect to aging temperature and time were investigated.The coarsening kinetics of γ' phase is derived,and an attempt is made to predict the γ' phase size at 10^(5)h.The results show that the shape of γ' phase is uniform spherical distribution after long term aging at 700℃/11023 h in the C-HRA-3 alloy.The size of the γ' phase increases and the shape changes from spherical to partially spherical after long term aging at 750℃/11023 h.The size of the γ' phase gradually increases with the increase in aging temperature and time,and the effect of aging temperature is more significant.The growth kinetics equation of the γ' phase in C-HRA-3 alloy after aging at 700 and 750℃ was obtained,and the effective activation energy of γ' phase growth,D_(Eff),was calculated to be 260 kJ/mol.It was predicted that the average diameter of the γ' phase would be about 140 nm and about 230 nm when aged at 700 and 750℃ for 10^(5)h,respectively.

关 键 词：C-HRA-3耐热合金 高温时效 γ'相 长大动力学 

分 类 号：TG159[金属学及工艺—热处理]