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Intergranular precipitation behavior and its influence on the stress relaxation cracking susceptibility of Super304H austenitic stainless steel weld metal during long-term aging
Xiao, Xiaopeng1,2; Li, Dianzhong1; Li, Yiyi1,3; Lu, Shanping1
Corresponding AuthorLu, Shanping(shplu@imr.ac.cn)
2021-08-01
Source PublicationMATERIALS CHARACTERIZATION
ISSN1044-5803
Volume178Pages:11
AbstractStress relaxation cracking failure is widely reported in the materials used for thermal power plants, which seriously affected the safety of thermal power units under long-term service. In our study, the influence of intergranular precipitation behavior on the stress relaxation cracking susceptibility of Super304H austenitic stainless steel weld metal was investigated based on the pre-compressed CT technique. The 45 degrees misorientation grain boundary has the lowest critical interfacial nucleation energy, followed by the grain boundaries away from the 45 degrees misorientation. As a result, the coarse intergranular M23C6 carbides were more prone to precipitate at 45 degrees misorientation grain boundary, which led to the lowest resistance to stress relaxation cracking susceptibility at 35 to 45 degrees grain boundary. Further analysis indicated that intergranular cavities were easily initiated at the noncoherent M23C6/gamma interface. Since the non-coherent interface with a low Cr concentration zone and high specific interfacial energy had a lower strength, the lattice distortion at the non-coherent interface could lead to higher strain concentration.
KeywordStress relaxation cracking Austenitic stainless steel weld metal Grain boundary misorientation Depletion of Cr
Funding OrganizationShenyang National Laboratory for Materials Science Innovation
DOI10.1016/j.matchar.2021.111309
Indexed BySCI
Language英语
Funding ProjectShenyang National Laboratory for Materials Science Innovation[L2019R35]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Materials Science, Characterization & Testing
WOS IDWOS:000678042300002
PublisherELSEVIER SCIENCE INC
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/159736
Collection中国科学院金属研究所
Corresponding AuthorLu, Shanping
Affiliation1.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
3.Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Xiao, Xiaopeng,Li, Dianzhong,Li, Yiyi,et al. Intergranular precipitation behavior and its influence on the stress relaxation cracking susceptibility of Super304H austenitic stainless steel weld metal during long-term aging[J]. MATERIALS CHARACTERIZATION,2021,178:11.
APA Xiao, Xiaopeng,Li, Dianzhong,Li, Yiyi,&Lu, Shanping.(2021).Intergranular precipitation behavior and its influence on the stress relaxation cracking susceptibility of Super304H austenitic stainless steel weld metal during long-term aging.MATERIALS CHARACTERIZATION,178,11.
MLA Xiao, Xiaopeng,et al."Intergranular precipitation behavior and its influence on the stress relaxation cracking susceptibility of Super304H austenitic stainless steel weld metal during long-term aging".MATERIALS CHARACTERIZATION 178(2021):11.
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