Surface recrystallisation and oxidation of polycrystalline superalloy castings during isothermal exposure at 1100 degrees C

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	Surface recrystallisation and oxidation of polycrystalline superalloy castings during isothermal exposure at 1100 degrees C
	W. G. Jiang; M. C. Yang; L. H. Lou; Z. Q. Hu
	2012
发表期刊	International Journal of Cast Metals Research
ISSN	1364-0461
卷号	25 期号:4 页码:195-200
摘要	The surface recrystallisation and oxidation of polycrystalline superalloy castings with different casting moduli were studied. Specimens exposed at 1100 degrees C for 2 h in hydrogen, and at 1100 degrees C for 2, 20 and 60 h in air were examined by optical and scanning electron microscopy and energy dispersive spectroscopy. No surface recrystallisation was observed on the surfaces of heavy section castings with moduli of 2.8 or 5.2 mm after exposure at 1100 degrees C, and the oxidation scale was only 50 mu m in thickness after exposure in air for 60 h. Surface recrystallisation was observed in the thin wall casting of 0.28 mm modulus; recrystallisation produced higher oxidation rates, owing to enhanced diffusion, and the oxidation scale thickness was 120 mu m after 60 h. The mechanism of surface recrystallisation and its effect in accelerating surface oxidation are discussed.
部门归属	[jiang, w. g.; yang, m. c.; lou, l. h.; hu, z. q.] chinese acad sci, inst met res, shenyang 110016, peoples r china.;jiang, wg (reprint author), chinese acad sci, inst met res, 72 wenhua rd, shenyang 110016, peoples r china.;wgjiang@imr.ac.cn
关键词	Superalloy Investment Casting Modulus Recrystallisation Residual Stress Oxidation Ni-base Superalloy Gas-turbine Blade Heat-treatment Dynamic Recrystallization Leading-edge Water-vapor Microstructure Behavior 900-degrees-c Evolution
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60025
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	W. G. Jiang,M. C. Yang,L. H. Lou,et al. Surface recrystallisation and oxidation of polycrystalline superalloy castings during isothermal exposure at 1100 degrees C[J]. International Journal of Cast Metals Research,2012,25(4):195-200.
APA	W. G. Jiang,M. C. Yang,L. H. Lou,&Z. Q. Hu.(2012).Surface recrystallisation and oxidation of polycrystalline superalloy castings during isothermal exposure at 1100 degrees C.International Journal of Cast Metals Research,25(4),195-200.
MLA	W. G. Jiang,et al."Surface recrystallisation and oxidation of polycrystalline superalloy castings during isothermal exposure at 1100 degrees C".International Journal of Cast Metals Research 25.4(2012):195-200.