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Precipitation Behavior and Mechanical Properties of a 16Cr-25Ni Superaustenitic Stainless Steel Weld Metal During Post-weld Heat Treatment
Tian, Wenbin1,2; Wu, Dong1; Li, Yiyi1,3; Lu, Shanping1
Corresponding AuthorLu, Shanping(shplu@imr.ac.cn)
2021-07-08
Source PublicationACTA METALLURGICA SINICA-ENGLISH LETTERS
ISSN1006-7191
Pages14
AbstractA 16Cr-25Ni superaustenitic stainless steel weld metal for austenitic stainless steel/ferrite heat-resistance steel dissimilar metal weld was designed and prepared through tungsten inert-gas welding. The precipitate evolution and its correlation with mechanical properties were investigated during post-weld heat treatment (PWHT) at 690 degrees C for up to 12 h. The primary precipitates in the as-welded weld metal were identified as Mo-rich M6C carbides in the interdendritic region and semicontinuous fine-sized M23C6 carbides along grain boundary. After PWHT, three types of precipitates coexisted in the interdendritic region: primary M6C carbides, newly precipitated Mo-rich M2X carbonitrides and some of the secondary M23C6 carbides. Additionally, mass secondary M23C6 carbides formed and coarsened along grain boundary. No undesirable intermetallic phases formed during the whole period. The M2X and interdendritic M23C6 improved the strength of the weld metal after PWHT, but the elongation and impact toughness degraded, which were mainly owing to the intergranular M23C6 carbides that changed the fracture mode from ductile transgranular mode to mixed mode of transgranular and intergranular fracture. Meanwhile, the coarsening of M2X carbonitrides may lead to the elongation loss during 8 h to 12 h. Evolution of impact toughness was also related to the M2X carbonitrides, which made the crack easier to propagate compared with austenitic matrix and contributed to the decline of impact toughness. However, due to the sluggish precipitation of M2X carbonitrides with longer holding time, the decreasing trend became slow from 4 to 12 h. The results showed that PWHT should be controlled within 8 h to obtain better combination of strength and ductility.
KeywordSuperaustenitic stainless steel Weld metal Post-weld heat treatment Precipitate evolution Mechanical properties
Funding Organizationinnovation project of Shenyang National Laboratory for Materials Science
DOI10.1007/s40195-021-01274-6
Indexed BySCI
Language英语
Funding Projectinnovation project of Shenyang National Laboratory for Materials Science[SYNL-2019]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000670867100001
PublisherCHINESE ACAD SCIENCES, INST METAL RESEARCH
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/160157
Collection中国科学院金属研究所
Corresponding AuthorLu, Shanping
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 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, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Tian, Wenbin,Wu, Dong,Li, Yiyi,et al. Precipitation Behavior and Mechanical Properties of a 16Cr-25Ni Superaustenitic Stainless Steel Weld Metal During Post-weld Heat Treatment[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2021:14.
APA Tian, Wenbin,Wu, Dong,Li, Yiyi,&Lu, Shanping.(2021).Precipitation Behavior and Mechanical Properties of a 16Cr-25Ni Superaustenitic Stainless Steel Weld Metal During Post-weld Heat Treatment.ACTA METALLURGICA SINICA-ENGLISH LETTERS,14.
MLA Tian, Wenbin,et al."Precipitation Behavior and Mechanical Properties of a 16Cr-25Ni Superaustenitic Stainless Steel Weld Metal During Post-weld Heat Treatment".ACTA METALLURGICA SINICA-ENGLISH LETTERS (2021):14.
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