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Effect of Nb and Mo on the Microstructure, Mechanical Properties and Ductility-Dip Cracking of Ni-Cr-Fe Weld Metals
Zhang, X; Li, DZ; Li, YY; Lu, SP; Lu, SP (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China.; Lu, SP (reprint author), Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China.
2016-10-01
Source PublicationACTA METALLURGICA SINICA-ENGLISH LETTERS
ISSN1006-7191
Volume29Issue:10Pages:928-939
AbstractA series of Ni-Cr-Fe welding wires with different Nb and Mo contents were designed to investigate the effect of Nb and Mo on the microstructure, mechanical properties and the ductility-dip cracking susceptibility of the weld metals by optical microscopy (OM), scanning electron microscopy, X-ray diffraction as well as the tensile and impact tests. Results showed that large Laves phases formed and distributed along the interdendritic regions with high Nb or Mo addition. The Cr-carbide (M23C6) was suppressed to precipitate at the grain boundaries with high Nb addition. Tensile testing indicates that the ultimate strength of weld metals increases with Nb or Mo addition. However, the voids formed easily around the large Laves phases in the interdendritic area during tensile testing for the weld metal with high Mo content. It is found that the tensile fractographs of high Mo weld metals show a typical feature of interdendritic fracture. The high Nb or Mo addition, which leads to the formation of large Laves phases, exposes a great weakening effect on the impact toughness of weld metals. In addition, the ductility-dip cracking was not found by OM in the selected cross sections of weld metals with different Nb additions. High Nb addition can eliminate the ductility-dip cracking from the Ni-Cr-Fe weld metals effectively.
description.department[zhang, xu ; li, dian-zhong ; li, yi-yi ; lu, shan-ping] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china ; [zhang, xu] univ sci & technol china, sch mat sci & engn, shenyang 110016, peoples r china ; [zhang, xu ; li, yi-yi ; lu, shan-ping] chinese acad sci, inst met res, key lab nucl mat & safety assessment, shenyang 110016, peoples r china
KeywordNb Mo Laves Phase Microstructure Mechanical Properties
Subject AreaMetallurgy & Metallurgical Engineering
Funding OrganizationNational Natural Science Foundation of China [51474203]; Chinese Academy of Sciences [KGZD-EW-XXX-2]
Indexed Bysci
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/76243
Collection中国科学院金属研究所
Corresponding AuthorLu, SP (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China.; Lu, SP (reprint author), Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China.
Recommended Citation
GB/T 7714
Zhang, X,Li, DZ,Li, YY,et al. Effect of Nb and Mo on the Microstructure, Mechanical Properties and Ductility-Dip Cracking of Ni-Cr-Fe Weld Metals[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2016,29(10):928-939.
APA Zhang, X,Li, DZ,Li, YY,Lu, SP,Lu, SP ,&Lu, SP .(2016).Effect of Nb and Mo on the Microstructure, Mechanical Properties and Ductility-Dip Cracking of Ni-Cr-Fe Weld Metals.ACTA METALLURGICA SINICA-ENGLISH LETTERS,29(10),928-939.
MLA Zhang, X,et al."Effect of Nb and Mo on the Microstructure, Mechanical Properties and Ductility-Dip Cracking of Ni-Cr-Fe Weld Metals".ACTA METALLURGICA SINICA-ENGLISH LETTERS 29.10(2016):928-939.
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