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Microstructure and Its Influence on the Mechanical Properties of Ni–28W–6Cr-Based Alloy-Welded Joints by GTAW

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

Microstructure and mechanical properties of Ni–28W–6Cr alloy-welded joints produced by gas tungsten arc welding were investigated in this work. Results showed that original fine-grain base metal near fusion line totally transformed into coarse heat affected zone after welding. Carbides with different shapes were found in the weld metal and base metal, which all were determined as M6C carbides. In comparison with carbides in base metal, M6C carbides in weld metal are rich in Si and Cr but deficient in W. Moreover, M6C carbides are extremely scarce and hard to be detected in weld metal. Mechanical tests show that the hardness value of weld metal is only about 60% of base metal; the yield strength and tensile strength of welded joint are much lower than those of base metal due to the absence of carbides in weld metal.

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Acknowledgements

The authors wish to thank Professor Chuanyong Cui from Institute of Metal Research, Chinese Academy of Sciences, for his generous support on the supply of Ni–28W–6Cr alloys. This study was funded by the National Natural Science Foundation of China (Grant No. 51601213), National Key Research and Development Program of China (Grant No. 2016YFB0700404), Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA02004210), and Talent development fund of Shanghai (Grant No. 201650).

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Authors and Affiliations

  1. Center for Thorium Molten Salt Reactor System, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China

    Shuang-Jian Chen, Xiang-Xi Ye, D. K. L. Tsang, Li Jiang, Chao-Wen Li, Kun Yu & Zhi-Jun Li

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  1. Shuang-Jian Chen
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  2. Xiang-Xi Ye
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Correspondence to Xiang-Xi Ye or Zhi-Jun Li.

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Chen, SJ., Ye, XX., Tsang, D.K.L. et al. Microstructure and Its Influence on the Mechanical Properties of Ni–28W–6Cr-Based Alloy-Welded Joints by GTAW. Acta Metall. Sin. (Engl. Lett.) 32, 1032–1040 (2019). https://doi.org/10.1007/s40195-019-00881-8

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  • DOI: https://doi.org/10.1007/s40195-019-00881-8

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