Spark plasma sintering cobalt base superalloy strengthened by Y-Cr-O compound through high-energy milling

被引：16

作者：

Tang, C. F. ^{[1
]}

Pan, F. ^{[1
]}

Qu, X. H. ^{[2
]}

Jia, C. C. ^{[2
]}

Duan, B. H. ^{[2
]}

He, X. B. ^{[2
]}

机构：

[1] Tsinghua Univ, Dept Mat Sci & Engn, Adv Mat Lab, Beijing 100084, PR, Peoples R China

[2] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Sch Mat Sci & Engn, Beijing 100083, Peoples R China

来源：

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY | 2008年 / 204卷 / 1-3期

关键词：

cobalt base superalloy; high-energy milling; spark plasma sintering; annealing;

D O I：

10.1016/j.jmatprotec.2007.10.084

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Powder cobalt base superalloy prepared by high-energy balling and spark plasma sintering are studied through metallography and compression test. The experimental results shows that the powder size and crystalline grain decrease and distortions of crystal lattice increases with milling time. These trends slow down after milling for 8 h. Addition of 1.5% methanol can lessen powders adherence and agglomeration. The relative density of the sintered compact is 99.2% by spark plasma sintering at 1100 degrees C and 40MPa. Its microstructure is fine with average grain size below 5 mu m. Its compression strength and elongation are 2506 MPa and 2.5%. Annealing heat treatment at 1300 degrees C can improve its elongation but decrease its strength. They are 23.0% and 1982MPa, respectively. The added nano-particles Y2O3 are changed into Y-Cr-O compounds to strengthen the cobalt base superalloy. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：111 / 116

页数：6