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Characterization of ferroniobium topologically close-packed phase inclusion in nickel-based 152 cladding of dissimilar metal welds
Li, Yifeng; Wang, Jianqiu; Han, En-Hou
2019-03-01
Source PublicationJOURNAL OF NUCLEAR MATERIALS
ISSN0022-3115
Volume515Pages:267-275
AbstractFerroniobium topologically close-packed (TCP) phase inclusions were found in the nickel-based152 nickel-based cladding of dissimilar metal weld joint in pressurized water nuclear reactor. A systematical investigation on the morphologies, microstructures and mechanical properties was conducted by using multi-scale techniques. The formation causes of the TCP-phase inclusion and its possible influences on crack initiation and propagation during long-term operation are also discussed. The ferroniobium TCP-phase inclusions originate from large-size ferroniobium supplement particles in 152 welding electrode flux during welding. The inclusion with core has a homogeneous kernel and a continuous transition zone between the core and eutectic zone, and the transition zone consists of columnar grain zone and isometric grain zone. The inclusion core is confirmed as single-phase rhombohedral Fe7Nb6 (mu phase), and columnar grain zone in the transition zone is also mainly Fe7Nb6, while the isometric grain zone and the Nb-rich phase in the eutectic zone are both mainly hexagonal Fe2Nb (Laves phase), the other phase in the eutectic zone is austenite. The Fe2Nb is formed by eutectic metallurgical reaction between inclusion core and 152 cladding. The average hardness of inclusion core (17.89 GPa) is over 4.5 times as high as cladding matrix (3.91 GPa). The TCP-phase inclusion is of higher cracking susceptibility than 152 cladding, and acts as the initiation of brittle cracks during in-situ tensile test. The ferroniobium TCP-phase inclusions are of higher cracking susceptibility than 152 cladding. (C) 2019 Elsevier B.V. All rights reserved.
KeywordTopologically close-packed phase Dissimilar metal weld joint Welding inclusion Ferroniobium Microstructure characterization In-situ tensile
Indexed BySCI
Language英语
WOS IDWOS:000456805800025
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/81335
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Li, Yifeng,Wang, Jianqiu,Han, En-Hou. Characterization of ferroniobium topologically close-packed phase inclusion in nickel-based 152 cladding of dissimilar metal welds[J]. JOURNAL OF NUCLEAR MATERIALS,2019,515:267-275.
APA Li, Yifeng,Wang, Jianqiu,&Han, En-Hou.(2019).Characterization of ferroniobium topologically close-packed phase inclusion in nickel-based 152 cladding of dissimilar metal welds.JOURNAL OF NUCLEAR MATERIALS,515,267-275.
MLA Li, Yifeng,et al."Characterization of ferroniobium topologically close-packed phase inclusion in nickel-based 152 cladding of dissimilar metal welds".JOURNAL OF NUCLEAR MATERIALS 515(2019):267-275.
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