Improving the strength-ductility of laser powder bed fusion René104 through high-density stacking faults induced by Sc and Y microalloying  

作　　者：Yazhou Zhang Zuming Liu Daoyan Jiang Shupeng Ye Tao Liu Lei Chen Cai Chen 

机构地区：[1]State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China

出　　处：《Journal of Materials Science & Technology》2024年第25期161-172,共12页材料科学技术(英文版)

基　　金：financially supported by the Project of Chinese Academy of Engineering(Nos.2019-XZ-11 and 2023-XY-18);the Open Fund of National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials of China(No.HKDNM201907).

摘　　要：Improving the strength-ductility is crucial to the development of high-performance nickel-based super-alloys fabricated via additive manufacturing(AM).In this study,Sc and Y microalloying is used to regu-late the microstructure and improve the strength-ductility of René104 supealloy(René104ScY).The re-sults suggest the formation of high-density stacking faults(SFs),Lomer-Cottrell locks,and nano-Al_(3)(Sc,Y)phases in the René104ScY matrix.The cellular/columnar structures are refined,the number of equiax-ial grains increases,and the number of columnar grains and their aspect ratio decrease in René104ScY.The synergistic effect of multiple strengthening mechanisms,including that formed by SFs,improves the strength and ductility of René104ScY fabricated via laser powder bed fusion.The yield strength,tensile strength,and elongation of René104ScY are 1059±15 MPa,1405±10 MPa,and 28.8%±0.6%,respec-tively.This study provides a novel approach for developing high-performance nickel-based superalloys using AM.

关 键 词：Nickel-based superalloy Laser powder bed fusion MICROALLOYING Stacking fault Strengthening mechanism 

分 类 号：TG1[金属学及工艺—金属学]