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Microstructure and Impact Toughness of Welding Heat-Affected Zones of a Fe-Cr-Ni-Mo High Strength Steel
Wen Mingyue1,2; Dong Wenchao1; Pang Huiyong3; Lu Shanping1
Corresponding AuthorLu Shanping(shplu@imr.ac.cn)
2018-04-01
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume54Issue:4Pages:501-511
AbstractMarine engineering steel is the key material for the construction of major marine infrastructure projects. Due to the harsh environment in the deep sea, the mechanical properties such as strength, low temperature toughness and so on of the marine steel are required to be higher. In this work, the weldability of a Fe-Cr-Ni-Mo high-strength steel was studied, and the microstructure and impact toughness of the steel after welding thermal cycling at different peak temperatures were analyzed. The results show that the average impact toughness of characteristic heat affected zone under different temperatures increases first and then decreases with the increase of peak temperature (T-p). The microstructures of coarse grain heat-affected zone (CGHAZ, T-P=1320 degrees C) and fine grain heat-affected zone (FGHAZ, T-p= 1020 degrees C) are quenched martensite. Because of the coarse grain size, the impact toughness of CGHAZ is poor, which is lower than that of FGHAZ. The microstructure of inter-critical heat-affected zone (ICHAZ, T-p =830 degrees C and T-p =760 degrees C) is composed of quenched martensite and tempered martensite. Due to the randomness of the proportion of the interfaces between the mixed microstructures near the V-notch, the impact energy values of ICHAZ fluctuates greatly. The homogeneous fine grain structure in ICHAZ (T-p= 830 degrees C) has a crack arrest effect during the impact deformation, which makes the characteristic zone have the best impact toughness. Although the grain size in ICHAZ (T-P=760 degrees C) is also fine, the existence of the ultra-fine grain zones (the grain size in which is only 1 similar to 2 mu m) benefits the formation of secondary voids under the impact load. The undissolved M2C and MC precipitations in matrix promote the connecting of secondary voids and then form the secondary cracks. As a result, the impact toughness of the characteristic zone is poor, and becomes the weak region of HAZ.
KeywordFe-Cr-Ni-Mo high strength steel welding heat affected zone impact toughness microstructure
Funding OrganizationNational Key Research and Development Program of China ; Key Programs of Chinese Academy of Sciences
DOI10.11900/0412.1961.2017.00331
Indexed BySCI
Language英语
Funding ProjectNational Key Research and Development Program of China[2016YFB0300601] ; Key Programs of Chinese Academy of Sciences[GFZD-125-15-003-1]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000433006500003
PublisherSCIENCE PRESS
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/128519
Collection中国科学院金属研究所
Corresponding AuthorLu Shanping
Affiliation1.Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Liaoning, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Liaoning, Peoples R China
3.Wuyang Iron & Steel Co Ltd, Pingdingshan 462500, Peoples R China
Recommended Citation
GB/T 7714
Wen Mingyue,Dong Wenchao,Pang Huiyong,et al. Microstructure and Impact Toughness of Welding Heat-Affected Zones of a Fe-Cr-Ni-Mo High Strength Steel[J]. ACTA METALLURGICA SINICA,2018,54(4):501-511.
APA Wen Mingyue,Dong Wenchao,Pang Huiyong,&Lu Shanping.(2018).Microstructure and Impact Toughness of Welding Heat-Affected Zones of a Fe-Cr-Ni-Mo High Strength Steel.ACTA METALLURGICA SINICA,54(4),501-511.
MLA Wen Mingyue,et al."Microstructure and Impact Toughness of Welding Heat-Affected Zones of a Fe-Cr-Ni-Mo High Strength Steel".ACTA METALLURGICA SINICA 54.4(2018):501-511.
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