Effect of carbon addition on microstructure and mechanical properties of a typical hard-to-deform Ni-base superalloy  

作　　者：Lei Jia Heng Cui Shufeng Yang Shaomin Lv 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：《Progress in Natural Science:Materials International》2023年第2期232-243,共12页自然科学进展·国际材料（英文版）

基　　金：The authors gratefully acknowledge financial support from the National Science and Technology Major Project(J2019-VI-0006-0120);the National Key R&D Program of China(2021YFB3700402);the National Natural Science Foundation of China(Grant No.52074092,52274330).

摘　　要：In this paper,the as-cast microstructure,microsegregation,and mechanical properties of GH4151 superalloys with a carbon addition were studied by scanner electron microscopy(SEM),transmission electron microscope(TEM),electron probe microanalysis(EPMA),differential thermal analyzer(DSC),and electron backscattered diffraction(EBSD).The results show that the solid solution effect of carbon in alloys is limited,the addition of C from 0.01 to 0.08wt%significantly refines the secondary dendrite spacing(SDAS)from 61.7 to 57.4 and 51.8μm.Due to the influence of thermal solutal convection,the most severe segregation is found in the C-0.04 alloy,and the solidification ranges of C-0.01,C-0.04,and C-0.08 alloys are 87℃,96℃,and 83℃,respectively.Owing to the reduced solidification pores and formed finely dispersed carbides,C-0.04 shows excellent ultimate tensile strength(442MPa)and superior total elongation(1.368%)at 1100℃ much better than that of C-0.01(130.7MPa,0.085%)and C-0.08(248MPa,1.026%).

关 键 词：GH4151 superalloys Carbon Microstructure and microsegregation Mechanical properties 

分 类 号：TG132.3[一般工业技术—材料科学与工程] V261[金属学及工艺—合金]