Evolution of microstructure and properties of a novel Ni-based superalloy during stress relief annealing  

作　　者：Lei Jia Heng Cui Shufeng Yang Shaomin Lü Xingfei Xie Jinglong Qu 

机构地区：[1]Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China [2]State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China [3]Beijing GAONA Materials&Technology Co.,Ltd.,Beijing 100081,China [4]High-Temperature Materials Institute,Central Iron and Steel Research Institute,Beijing 100081,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2024年第8期1876-1889,共14页矿物冶金与材料学报（英文版）

基　　金：This work was financially supported by the National Science and Technology Major Project of China(No.J2019-VI-0006-0120);the National Key R&D Program of China(No.2021YFB3700402);the National Natural Science Foundation of China(Nos.52074092 and 52274330).

摘　　要：We discussed the decrease in residual stress,precipitation evolution,and mechanical properties of GH4151 alloy in different annealing temperatures,which were studied by the scanning electron microscope(SEM),high-resolution transmission electron microscopy(HRTEM),and electron backscatter diffraction(EBSD).The findings reveal that annealing processing has a significant impact on diminishing residual stresses.As the annealing temperature rose from 950 to 1150℃,the majority of the residual stresses were relieved from 60.1 MPa down to 10.9 MPa.Moreover,the stress relaxation mechanism transitioned from being mainly controlled by dislocation slip to a combination of dislocation slip and grain boundary migration.Meanwhile,the annealing treatment promotes the decomposition of the Laves,accompanied by the precipitation ofμ-(Mo_(6)Co_(7))starting at 950℃ and reaching a maximum value at 1050℃.The tensile strength and plasticity of the annealing alloy at 1150℃ reached the maximum(1394 MPa,56.1%)which was 131%,200%fold than those of the as-cast alloy(1060 MPa,26.6%),but the oxidation process in the alloy was accelerated at 1150℃.The enhancement in durability and flexibility is primarily due to the dissolution of the brittle phase,along with the shape and dispersal of theγ′phase.

关 键 词：GH4151 alloy annealing treatment residual stress precipitation evolution STRENGTH mechanical properties 

分 类 号：TG132.3[一般工业技术—材料科学与工程] TG156[金属学及工艺—合金]