Microstructural change and stress rupture property of Nimonic 105 superalloy for advanced ultra-supercritical power plants  

作　　者：Tao Peng Bin Yang Gang Yang Lu Wang Zhi-hua Gong 

机构地区：[1]Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China [2]Institute for Special Steels,Central Iron and Steel Research Institute,Beijing 100081,China[3]State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China [4]Huadian Electric Power Research Institute Co.,Ltd,Hangzhou 310030,Zhejiang,China

出　　处：《Journal of Iron and Steel Research International》2021年第7期842-852,共11页

基　　金：the National Key Research and Develop plan,China(No.2016YFB0300203).

摘　　要：Microstructural change,stress rupture property,deformation and fracture mechanisms of Nimonic 105 superalloy at 750℃have been studied.Experimental results showed that the stress rupture strength of the alloy at 750℃ for 10^(5)h is about 200 MPa.γ'precipitates and M_(23)C_(6)carbides grew gradually with prolonging the rupture time,while no significant change was observed in MC carbide morphology.After stress rupture test at 750℃ and 250 MPa for 23,341 h,a transition from spherical to cuboidal morphology of γ'precipitates was found,and nearly continuous chains of M_(23)C_(6)carbides formed on the grain boundary.Orowan looping and strongly coupled dislocation pairs cutting and microtwinning were the dominant deformation mechanisms at 750℃ and 350-450 MPa,while the main deformation mode was Orowan looping at 750℃ and 250 MPa.The failure of the alloy was mainly attributed to the nucleation,growth and interlinkage of voids.

关 键 词：Nimonic 105 superalloy Ni-based superalloy Microstructural change Stress rupture property Deformation mechanism 

分 类 号：TG146.15[一般工业技术—材料科学与工程]