The Effects of Co on the Microstructure and Mechanical Properties of Ni-Based Superalloys Prepared via Selective Laser Melting
发布时间：2023-05-06
点击次数：
影响因子：3.4
DOI码：10.3390/ma16072926
所属单位：中南大学粉末冶金研究院
教研室：高温结构材料研究所
发表刊物：Materials
项目来源：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）
关键字：Ni-base superalloy, Selective laser melting, Cobalt, Strength, Ductility
摘要：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.
合写作者：Feng Liu, Lan Huang, Lin Ye, Heng Dong, 王丽, Xiaochao Jin, Yong Liu
第一作者：Ouyang, Xiaoqiong
论文类型：Article
通讯作者：谭黎明
论文编号：2926
学科门类：工学
一级学科：冶金
卷号：16
期号：7
ISSN号：1996-1944
是否译文：否
发表时间：2023-05-06