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Microstructures and Mechanical Properties of Weld Metal and Heat-Affected Zone of Electron Beam-Welded Joints of HG785D Steel

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Abstract

Vacuum electron beam welding (EBW) process was employed to butt weld 10-mm-thick HG785D high-strength steels. The penetration into the steel was adjusted by beam current. Microstructures at weld metal and heat-affected zone (HAZ) regions were comparatively observed. Mechanical properties of the EBWed joints including Vickers hardness, tensile and Charpy impact tests were evaluated. The results indicated that microstructures at the weld metal consisted of coarse lath martensite and a small amount of acicular martensite, while that in the HAZ was tempered sorbite and martensite. The grain size in the weld metal was found to be larger than that in the HAZ, and its proportion in weld metal was higher. The hardness in the weld metal was higher than the HAZ and base metal. The tensile strength and impact toughness in the HAZ was higher than that in the weld metal. All the behaviors were related to microstructure evolution caused by higher cooling rates and state of base metal. The fracture surfaces of tensile and impact tests on the optimized joint were characterized by uniform and ductile dimples. The results differed significantly from that obtained using arc welding process.

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Acknowledgments

The research was financially supported by Postdoctoral Science Foundation of China (No. 2015M571406).

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Authors and Affiliations

  1. School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing, 100044, China

    Qiang Zhang, Jianmin Han, Zhiyong Yang & Junqiang Wang

  2. Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology, Weihai, 264209, China

    Caiwang Tan

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  1. Qiang Zhang
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  2. Jianmin Han
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  3. Caiwang Tan
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  4. Zhiyong Yang
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  5. Junqiang Wang
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Correspondence to Jianmin Han or Caiwang Tan.

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Zhang, Q., Han, J., Tan, C. et al. Microstructures and Mechanical Properties of Weld Metal and Heat-Affected Zone of Electron Beam-Welded Joints of HG785D Steel. J. of Materi Eng and Perform 25, 5522–5529 (2016). https://doi.org/10.1007/s11665-016-2349-0

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  • DOI: https://doi.org/10.1007/s11665-016-2349-0

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