Effects of long term aging on microstructure and properties of a tungsten bearing heat resistant alloy

作     者：Han-sheng Bao Gang Yang Zheng-zong Chen Zheng-dong Liu Han-sheng Bao;Gang Yang;Zheng-zong Chen;Zheng-dong Liu

作者机构：Institute for Special SteelsCentral Iron and Steel Research InstituteBeijing 100081China 

出 版 物：《Journal of Iron and Steel Research International》 (国际钢铁研究杂志)

年 卷 期：2020年第27卷第4期

页      面：477-487页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：The authors acknowledge the financial support from the National Key Research and Development Program China(No.2017YFB0305203) 

主　　题：Tungsten Long-term aging Heat-resistant alloy gama′-phase Coarsening rate 

摘      要：The effects of long-term aging at 700 and 750℃ on microstructure and mechanical properties of a new developed tungsten bearing heat-resistant alloy used for advanced ultra-supercritical power plant was investigated both experimentally and *** results showed that the mechanical properties maintained excellent stability after long-term aging at 700℃ for 10,000h,while the impact absorbing energy decreased sharply after 1000-h aging and then kept constant till 10,*** main precipitates after long-term aging at 700 and 750℃ were M23C6,MC and homogeneous γ′-*** mass fraction of M23C6 carbides increased with increasing aging time,and M23C6 carbides precipitated in shape of chains and lamellas on grain *** slight decrease in MC carbides during aging may be due to degradation *** weight fraction of γ′-phase increased with the aging time,and then changed little after 5000h;γ′-phase exhibited excellent microstructure stability and low coarsening rate during long-term aging at 700℃.However,the coarsening rate of γ′-phase was much higher at 750℃.