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Effect of Nb and Mo on the Microstructure, Mechanical Properties and Ductility-Dip Cracking of Ni–Cr–Fe Weld Metals

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

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.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Grant No. 51474203) and the Key Research Program of the Chinese Academy of Sciences (Grant No. KGZD-EW-XXX-2). The authors also thank the assistance provided by China First Heavy Machinery Co. Ltd. in the welding process.

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Authors and Affiliations

  1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Xu Zhang, Dian-Zhong Li, Yi-Yi Li & Shan-Ping Lu

  2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China

    Xu Zhang

  3. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Xu Zhang, Yi-Yi Li & Shan-Ping Lu

Authors
  1. Xu Zhang
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  2. Dian-Zhong Li
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  3. Yi-Yi Li
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  4. Shan-Ping Lu
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Correspondence to Shan-Ping Lu.

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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. Acta Metall. Sin. (Engl. Lett.) 29, 928–939 (2016). https://doi.org/10.1007/s40195-016-0469-z

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  • DOI: https://doi.org/10.1007/s40195-016-0469-z

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