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Effect of Nickel Contents on the Microstructure and Mechanical Properties for Low-Carbon Bainitic Weld Metals
Department固体润滑国家重点实验室
Mao, Gaojun1; Cao, Rui1; Yang J(杨军)2; Jiang, Yong3; Wang S(王帅)2; Guo, Xili3; Yuan, Junjun1; Zhang, Xiaobo1; Chen, Jianhong1
2017
Source PublicationJournal of Materials Engineering and Performance
ISSN1059-9495
Volume26Issue:5Pages:2057-2071
Abstract

Multi-pass weld metals were deposited on Q345 base steel using metal powder-flux-cored wire with various Ni contents to investigate the effects of the Ni content on the weld microstructure and property. The types of the microstructures were identified by optical microscope, scanning electron microscope, transmission electron microscope, and micro-hardness tests. As a focusing point, the lath bainite and lath martensite were distinguished by their compositions, morphologies, and hardness. In particular, a number of black plane facets appearing between lath bainite or lath martensite packets were characterized by laser scanning confocal microscope. The results indicated that with the increase in Ni contents in the range of 0, 2, 4, and 6%, the microstructures in the weld-deposited metal were changed from the domination of the granular bainite to the majority of the lath bainite and/or the lath martensite and the micro-hardness of the weld-deposited metal increased. Meanwhile, the average width of columnar grain displays a decreasing trend and prior austenite grain size decreases while increases with higher Ni content above 4%. Yield strength and ultimate tensile strength decrease, while the reduction in fracture area increases with the decreasing Ni mass fraction and the increasing test temperature, respectively. And poor yield strength in Ni6 specimen can be attributed to elements segregation caused by weld defect. Finally, micro-hardness distribution in correspondence with specimens presents as a style of cloud-map.

KeywordBlack Plane Facets Micro-hardness Microstructure Multi-pass Weld Metals Ni Content Tensile Property
Subject Area材料科学与物理化学
DOI10.1007/s11665-017-2638-2
Funding OrganizationNational Nature Science Foundation of China (No. 51675255);Pre-research of National Basic Research Program of China (2014CB660810);the Rose Willow Outstanding Individual Programs of Lanzhou University of Technology (J201203)
Indexed BySCI
If1.331
Language英语
compositor第二作者单位
Citation statistics
Cited Times:19[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.licp.cn/handle/362003/22168
Collection固体润滑国家重点实验室(LSL)
Corresponding AuthorCao, Rui; Chen, Jianhong
Affiliation1.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China
2.Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China
3.Atlantic China Welding Concumables Inc, Zigong 643000, Peoples R China
Recommended Citation
GB/T 7714
Mao, Gaojun,Cao, Rui,Yang J,et al. Effect of Nickel Contents on the Microstructure and Mechanical Properties for Low-Carbon Bainitic Weld Metals[J]. Journal of Materials Engineering and Performance,2017,26(5):2057-2071.
APA Mao, Gaojun.,Cao, Rui.,Yang J.,Jiang, Yong.,Wang S.,...&Chen, Jianhong.(2017).Effect of Nickel Contents on the Microstructure and Mechanical Properties for Low-Carbon Bainitic Weld Metals.Journal of Materials Engineering and Performance,26(5),2057-2071.
MLA Mao, Gaojun,et al."Effect of Nickel Contents on the Microstructure and Mechanical Properties for Low-Carbon Bainitic Weld Metals".Journal of Materials Engineering and Performance 26.5(2017):2057-2071.
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