Fabrication of a turbine disk alloy by electron beam sheet lamination and investigation on the improved high temperature creep performance  

作　　者：Xiaogang You Yi Tan Masao Takeyama Pengting Li Yi Li Huixing Zhang Hongyang Cui Chuanyong Cui Yinong Wang Jiayan Li Zhijun Zhang Gengyi Dong Wenjia Xiao 

机构地区：[1]Key Laboratory of Materials Modification by Laser,Ion and Electron Beams(Dalian University of Technology),Ministry of Education,School of Materials Science and Engineering,Dalian 116024,China [2]Department of Materials Science and Engineering,School of Materials and Chemical Technology,Tokyo Institute of Technology,Japan [3]Shi-changxu Innovation Center for Advanced Materials,Chinese Academy of Sciences,Institute of Metal Research,Shenyang 110016,China [4]Department of Materials Engineering,The University of British Columbia,Vancouver,Canada [5]School of Mechatronics Engineering and Automation,Foshan University,Foshan 528225,China

出　　处：《Journal of Materials Science & Technology》2023年第12期216-233,共18页材料科学技术（英文版）

基　　金：financially supported by the National Key R&D Program of China (No.2019YFA0705300);the National Natural Science Foundation of China (No.52004051);the Doctoral Start-up Foundation of Liaoning Province (No.2021-BS-069);Support Plan for Innovation Teams in Key Areas of Dalian (No.2019RT13).

摘　　要：A turbine disk alloy was prepared by electron beam sheet lamination(EBSL),giving a refined microstruc-ture and high purity,and the microstructure-property relationship of this alloy has been developed.The alloy showed an outstanding creep life of 1266.3 h at 953 K/500 MPa.Compared with the conventional vacuum induction melted and vacuum arc re-melted alloy,a smaller dendrite arm spacing of less than 23μm was obtained through the EBSL method,which restricted the formation of large inter-dendritic carbides.As a result,the typical intergranular failure mode was observed in the EBSL alloy,whereas the transgranular fracture mode was dominant in the conventional alloy.The inter-dendritic MC carbides formed from the reverse diffusion of Nb are believed to either impede grain boundary sliding or initi-ate cracks,depending on their size and morphology.The tiny grain boundary precipitates of theδphase in the EBSL alloy could reduce the critical stress for microvoid nucleation to 161.07 MPa by decoher-ing the particle/matrix interface,or allowing vacancy condensation near theδinterface,resulting in the formation of grain boundary microcracks.In the conventional alloy,however,the larger-sized MC car-bides which were formed during the solidification process(0.36 vol.%)nucleated the microcracks within the particles,leading to the transgranular fracture.Furthermore,the results indicated that the nanoscaleγ′andγ″precipitates contributed primarily to strengthening and coordinating intragranular deforma-tion during creep,in which the Orowan mechanism and shearing of a/6<211>partial dislocations and a/2<110>doublets were active forγ′andγ″precipitates,respectively.

关 键 词：Electron beam SUPERALLOY SEGREGATION DEFORMATION PRECIPITATION 

分 类 号：TG146.23[一般工业技术—材料科学与工程]