Impact Factor:3.4
DOI number:10.3390/ma16072926
Affiliation of Author(s):中南大学粉末冶金研究院
Teaching and Research Group:高温结构材料研究所
Journal:Materials
Funded by:中国国家自然科学基金（52074366和52001334）；国家科学技术主要项目（J2019-IV-0003-0070）；中国湖南省自然科学基金（2021JJ40757）；湖南省科技创新计划（2021RC3131）
Key Words:Ni-base superalloy, Selective laser melting, Cobalt, Strength, Ductility
Abstract:In this work, two Ni-based superalloys with 13 wt.% and 35 wt.% Co were prepared via selective laser melting (SLM), and the effects of Co on the microstructure and mechanical properties of the additively manufactured superalloys were investigated. As the Co fraction increased from 13 wt.% to 35 wt.%, the average grain size decreased from 25.69 mu m to 17.57 mu m, and the size of the nano-phases significantly increased from 80.54 nm to 230 nm. Moreover, the morphology of the gamma' phase changed from that of a cuboid to a sphere, since Co decreased the gamma/gamma' lattice mismatch from 0.64% to 0.19%. At room temperature, the yield strength and ultimate tensile strength of the 13Co alloy reached 1379 MPa and 1487.34 MPa, and those of the 35Co alloy were reduced to 1231 MPa and 1350 MPa, while the elongation increased by 52%. The theoretical calculation indicated that the precipitation strengthening derived from the gamma ' precipitates made the greatest contribution to the strength.
Co-author:Feng Liu, Lan Huang, Lin Ye, Heng Dong, Li Wang, Xiaochao Jin, Yong Liu
First Author:Ouyang, Xiaoqiong
Indexed by:Article
Correspondence Author:Liming Tan
Document Code:2926
Discipline:Engineering
First-Level Discipline:冶金
Volume:16
Issue:7
ISSN No.:1996-1944
Translation or Not:no