Oxidation behavior of the directionally solidified Ni-base superalloy DS951 in air

被引：20
作者：
Huang, L [1 ]
Sun, XF [1 ]
Guan, HR [1 ]
Hu, ZQ [1 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, Superalloy Dept, State Key Lab Corros & Protect, Shenyang 110016, Peoples R China
来源：
OXIDATION OF METALS | 2005年 / 64卷 / 5-6期
关键词：
Ni-base superalloy; DS951; oxidation; kinetics; microstructure;
D O I：
10.1007/s11085-005-8529-1
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The isothermal oxidation behavior at 1000, 1050 and 1100 degrees C and the cyclic oxidation behavior at 1000 degrees C of the directionally solidified Ni-base superalloy DS951 were investigated. The oxidized samples were characterized by SEM, EDAX, XRD. The alloy DS951 obeyed a two-stage parabolic rate law during isothermal oxidation at 1000-1100 degrees C. In cyclic conditions, the alloy showed no weight loss even after 1100 cycles. Cross-sectional examination revealed the development of faceted and needle-shaped AlN precipitates in the alloy subsurface region during cyclic oxidation, while no internal corrosion products were found in isothermal tests. Furthermore, a selective oxidation of MC carbides (M was predominately niobium with some chromium and tungsten) was observed along alloy grain boundaries and in interdendritic areas.
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收藏
页码：303 / 318
页数：16
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