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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
Corresponding AuthorMa Yingche(ycma@imr.ac.cn)
2015-07-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume51Issue:7Pages:807-814
AbstractSignificant 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%.
KeywordNi-Cr-W-Fe alloy long-term aging gamma'phase tensile property
Indexed BySCI
Language英语
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000358471900006
PublisherSCIENCE PRESS
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/120460
Collection中国科学院金属研究所
Corresponding AuthorMa Yingche
AffiliationChinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
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.
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