Effect of Nb and Mo on the microstructure, mechanical properties and ductility-dip cracking of Ni-Cr-Fe weld metals
发布时间：2024-10-09点击次数：
- 影响因子：2.4
- DOI码：10.1007/s40195-016-0469-z
- 所属单位：中国科学院金属研究所
- 教研室：0
- 发表刊物：Acta Metallurgica Sinica-English Letters
- 刊物所在地：中国
- 项目来源：中国国家自然科学基金，中国科学院重点研究计划
- 关键字：Nb; Mo; Laves phase; Microstructure; Mechanical properties
- 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 (M 23C6) 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.
- 备注：0
- 论文类型：研究论文
- 学科门类：工学
- 卷号：29
- 期号：10
- 页面范围：928-939
- ISSN号：2194-1289
- 是否译文：否
- 发表时间：2016-01-01
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- 性别：男
- 职称：副教授
- 学历：研究生
- 学位：博士
- 所在单位：材料科学与工程学院
- 学科： 材料加工工程
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