High-Temperature Oxidation Behavior of High-Aluminum (Co,Ni)-Based Superalloys for Friction Stir Welding (FSW) Tools

被引:2
作者
Silva Salgado, M., V [1 ]
Chaia, N. [1 ]
Rezende Silva, A. L. C. [1 ]
Freitas, B. X. [1 ]
Costa, A. M. S. [2 ]
Coelho, G. C. [1 ]
Nunes, C. A. [1 ]
机构
[1] Univ Sao Paulo, Dept Engn Mat DEMAR, Escola Engn Lorena EEL, BR-12602110 Lorena, SP, Brazil
[2] Natl Inst Technol INT, BR-20081312 Rio De Janeiro, RJ, Brazil
来源
OXIDATION OF METALS | 2021年 / 95卷 / 1-2期
关键词
(Co; Ni)-based superalloys; Friction stir welding tools; High-temperature oxidation; Alumina forming; Parabolic behavior; ALLOYS; NICKEL; KINETICS; GROWTH; TA;
D O I
10.1007/s11085-020-10013-8
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
The present investigation focuses on the thermal oxidation of two, Nb- and Ta-alloyed (Ni,Co)-based superalloys having in their microstructures high contents of hard phases and considered potential candidates as a tool for friction stir welding process. The alloys were produced by investment casting using high-purity elements in induction furnace under vacuum atmosphere. The alloys were oxidized pseudo-isothermally up to 1000 h in muffle furnace under laboratory air, and the mass change was monitored manually using an analytical balance. External oxidation products growing on the surface of the oxidized samples were mainly Cr2O3 and Al2O3. At 800 and 900 degrees C, internal oxidation products were also observed and consist of Al2O3 and AlN. From a kinetic point of view, both superalloys presented the same behavior at 800 and 900 degrees C with k(p) values typical of alumina formers. However, Ta-alloyed material exhibited superior oxidation resistance at 1000 degrees C when compared to the alloy containing Nb.
引用
收藏
页码:203 / 220
页数:18
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