Oxidation behavior of sputtered microcrystalline coating of superalloy K17F at high temperature

被引:51
作者
Lou, HY [1 ]
Tang, YJ [1 ]
Sun, XF [1 ]
Guan, HR [1 ]
机构
[1] ACAD SINICA,INST MET RES,SHENYANG 110015,PEOPLES R CHINA
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1996年 / 207卷 / 01期
基金
中国国家自然科学基金;
关键词
K17F; sputtering; oxidation behavior;
D O I
10.1016/0921-5093(95)10021-0
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The influence of sputtering on the high temperature oxidation resistance of the cast superalloy M17F has been studied. The as-sputtered microcrystalline layer has a homogeneous gamma phase structure with very fine gl ain size (20-100 nm), while the as-cast alloy is composed of gamma, gamma' and carbides. The oxidation resistance of the microcrystalline coating of K17F alloy is much better than that of the as-cast alloy, and is even superior to that of the pack aluminized alloy. At the initial oxidation stage, the oxide scale which formed on the as-cast alloy is composed of complex oxides of Cr, Ti, Ni and Al. As the: oxidation time is prolonged, the amount of alpha-Al2O3 increases and becomes the main product. However, the scale which formed on the microcrystalline coating consists only of alpha-Al2O3. Cyclic oxidation and acoustic emission examination showed that the oxide scale on the cast M17F alloy easily spalled during cooling, but the alpha-Al2O3 scale on the sputtered layer had excellent adhesion. The beneficial effects of microcrystalline structure on oxidation resistance are discussed briefly.
引用
收藏
页码:121 / 128
页数:8
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