EFFECT OF LONG-TERM AGING AT 760 degrees C ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A Ni-Cr-W-Fe ALLOY

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	EFFECT OF LONG-TERM AGING AT 760 degrees C ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A Ni-Cr-W-Fe ALLOY
	Hao Xianchao; Zhang Long; Xiong Chao; Ma Yingche; Liu Kui
通讯作者	Ma Yingche(ycma@imr.ac.cn)
	2015-07-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	51 期号:7 页码:807-814
摘要	Significant efforts on development of advanced ultra-supercritical (A-USC) fossil fired power plants with steam conditions of 700 degrees C and 30 MPa or higher have been made in recent years. The most important consideration is the development of materials for superheater and reheater tubes with working temperature as high as 760 degrees C. During the design and application of these materials, phase stability, creep rupture strength and corrosion performance at 700 similar to 760 degrees C should be evaluated. A new type Ni-Cr-W-Fe alloy has been designed for A-USC power plants and the microstructure and mechanical properties of Ni-Cr-W-Fe alloy after long-term aging at 760 degrees C was investigated using OM, SEM, TEM and tensile testing in this work. The fractographs of tensile samples were observed. The results show that the average gain size of specimen after solution-annealing at 1100 degrees C is about 80 mu m with twin planes present in the matrix. The major precipitates after aging at 760 degrees C for 16 h are M23C6 and gamma'. The average particle size and the volume fraction of gamma'phase are approximately 29 nm and 19%, respectively. The coarsening behavior of gamma' during long-term aging at 760 degrees C follows Ostwald ripening theory. The solution-annealed Ni-Cr-W-Fe alloy performs excellent ductility at room temperature and the fracture mode of is ductile. The room temperature tensile strengths increase obviously with the decreasing of elongation and reduction of area after aging treatment. The yield strengths at both room and elevated temperatures decrease gradually with the extending aging time at 760 degrees C. The tensile ductility at room temperature of Ni-Cr-W-Fe alloy decreases after aging from 1000 to 3000 h, while the elevated temperature ductility varies mildly and keeps at approximately 15%.
关键词	Ni-Cr-W-Fe alloy long-term aging gamma'phase tensile property
收录类别	SCI
语种	英语
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000358471900006
出版者	SCIENCE PRESS
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/120460
专题	中国科学院金属研究所
通讯作者	Ma Yingche
作者单位	Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Hao Xianchao,Zhang Long,Xiong Chao,et al. EFFECT OF LONG-TERM AGING AT 760 degrees C ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A Ni-Cr-W-Fe ALLOY[J]. ACTA METALLURGICA SINICA,2015,51(7):807-814.
APA	Hao Xianchao,Zhang Long,Xiong Chao,Ma Yingche,&Liu Kui.(2015).EFFECT OF LONG-TERM AGING AT 760 degrees C ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A Ni-Cr-W-Fe ALLOY.ACTA METALLURGICA SINICA,51(7),807-814.
MLA	Hao Xianchao,et al."EFFECT OF LONG-TERM AGING AT 760 degrees C ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A Ni-Cr-W-Fe ALLOY".ACTA METALLURGICA SINICA 51.7(2015):807-814.