Investigation on the Microstructure and Mechanical Properties of Ni-Based Superalloy with Scandium
点击次数：
影响因子：
2.9
DOI码：
10.3390/met13030611
所属单位：
中南大学粉末冶金研究院
发表刊物：
Metals
项目来源：
国家科学技术大项目（J2019-IV-0003-0070）、中国自然科学基金（91860105、52074366）、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-based superalloy, Scandium, Grain, Gamma' precipitate, Tensile property
摘要：
In this work, a method concerning thermal consolidation is proposed to simulate the traditional powder metallurgy process and accomplish the composition screening of powder metallurgy Ni-based superalloys U720Li and RR1000 with rare metal scandium, and superalloys with zero scandium addition, medium scandium addition and high scandium addition are selected. Then effects of scandium on the microstructure and mechanical properties of superalloys are further investigated through fast hot pressed sintering. The results indicate that scandium doping can effectively refine the grain through modifying the size and volume fraction of primary ?' precipitates at the grain boundary. Meanwhile, scandium can promote the growth and precipitation of secondary ?' precipitates to some extent. Due to the comprehensive effects of ?' precipitate modification and grain boundary strengthening, as-sintered U720Li with 0.043 wt.% scandium presents an excellent combination of tensile strength and ductility at ambient and elevated temperature while as-sintered RR1000 with 0.064 wt.% scandium has a good performance at elevated temperature.
合写作者：
Feng Liu, Heng Dong, Xiaoqiong Ouyang, Xiangyou Xiao, Lan Huang
第一作者：
Lin Ye
论文类型：
Article
通讯作者：
谭黎明, Lan Huang
学科门类：
工学
一级学科：
冶金
卷号：
13
期号：
3
ISSN号：
2075-4701
是否译文：
否
学位：博士学位
职称：副研究员
学科：材料科学与工程
所在单位：粉末冶金研究院