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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
发表期刊ACTA METALLURGICA SINICA-ENGLISH LETTERS
ISSN1006-7191
卷号29期号:10页码:928-939
摘要A 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.
部门归属[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
关键词Nb Mo Laves Phase Microstructure Mechanical Properties
学科领域Metallurgy & Metallurgical Engineering
资助者National Natural Science Foundation of China [51474203]; Chinese Academy of Sciences [KGZD-EW-XXX-2]
收录类别sci
语种英语
文献类型期刊论文
条目标识符http://ir.imr.ac.cn/handle/321006/76243
专题中国科学院金属研究所
通讯作者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.
推荐引用方式
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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