Oxidation Behavior of GH984G Alloy in Steam at 700 degrees C

doi:10.11900/0412.1961.2018.00440

CORC > 金属研究所 > 中国科学院金属研究所

	Oxidation Behavior of GH984G Alloy in Steam at 700 degrees C
	Wang Changshuai 1; Guo Lili 1; Tang Liying 2; Zhou Rongcan 2; Guo Jianting 1; Zhou Lanzhang 1
刊名	ACTA METALLURGICA SINICA
	2019-07-11
卷号	55 期号:7 页码:893-901
关键词	GH984G alloy Ni-Fe-Cr base alloy steam oxidation 700 degrees C ultra-supercritical coal-fired power plant
ISSN号	0412-1961
DOI	10.11900/0412.1961.2018.00440
通讯作者	Wang Changshuai(cswang@imr.ac.cn)
英文摘要	To produce abundant and cheap electricity in a cleaner way, the next generation of advanced ultra-supercritical (A-USC) coal-fired power plants with higher thermal efficiency will operate at service temperatures at 700 degrees C and steam pressures up to 35 MPa. However, the temperature capacity of the currently used terrific or austenitic steels in USC plants at 600 degrees C cannot meet the requirements. GH984G is a newly developed Ni-Fe-Cr base alloy designed for A-USC, but its oxidation behavior in steam at 700 V is unclear. In this work, the oxidation kinetics of GH984G alloy in steam at 700 degrees C was investigated by weighting specimens at intervals. Morphology, composition and phase constituent of the steam oxide scale were characterized using SEM, EDS and XRD. The results show that the oxidation of GH984G alloy follows a parabolic law with a rate constant of 0.00521 mg/(cm(2).h(1/2)) and steady weight gain rate of 8 x 10(-4) g/(m(2).h). The oxide scale mainly consists of Cr2O3 and Al2O3. Meanwhile, a small amount of TiO2 was observed. The oxide scale of Cr2O3 forms on the alloy surface and then the internal oxidation of Al to be Al2O3 occurs along the grain boundaries of the matrix alloy and TiO2 forms at the surface of the external oxide scale. The morphology of Cr2O3 at the surface of the oxide scale is needle-like at the initial oxidation stage and then the agglomeration of Cr2O3 was observed and the cellular shape forms. Finally, the coalescence of the cellular Cr2O3 appears and the flat surface of the external oxide scale forms. The excellent oxidation resistant of GH984G alloy in steam at 700 degrees C can be attributed to the compact external oxide scale of Cr2O3 and the root-like internal oxide scale of Al2O3.
资助项目	National Key Research and Development Program of China[2017YFB0305204] ; National High Technology Research and Development Program of China[2012AA03A501] ; National Natural Science Foundation of China[51301171] ; National Energy Administration Program of China[NY20150102] ; Science and Technology Program of Sichuan Province[2016JZ0036]
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000471268000009
资助机构	National Key Research and Development Program of China ; National High Technology Research and Development Program of China ; National Natural Science Foundation of China ; National Energy Administration Program of China ; Science and Technology Program of Sichuan Province
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/134141]
专题	金属研究所_中国科学院金属研究所
通讯作者	Wang Changshuai
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China 2.Xian Thermal Power Res Inst Co Ltd, Xian 710032, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Wang Changshuai,Guo Lili,Tang Liying,et al. Oxidation Behavior of GH984G Alloy in Steam at 700 degrees C[J]. ACTA METALLURGICA SINICA,2019,55(7):893-901.
APA	Wang Changshuai,Guo Lili,Tang Liying,Zhou Rongcan,Guo Jianting,&Zhou Lanzhang.(2019).Oxidation Behavior of GH984G Alloy in Steam at 700 degrees C.ACTA METALLURGICA SINICA,55(7),893-901.
MLA	Wang Changshuai,et al."Oxidation Behavior of GH984G Alloy in Steam at 700 degrees C".ACTA METALLURGICA SINICA 55.7(2019):893-901.