International Journal of Naval Architecture and Ocean Engineering

The Society of Naval Architects of Korea (대한조선학회)
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Hardness prediction based on microstructure evolution and residual stress evaluation during high tensile thick plate butt welding

  • Zhou, Hong (School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology) ;
  • Zhang, Qingya (School of Naval Architecture and Ocean Engineering, Huazhong University of Science and Technology) ;
  • Yi, Bin (School of Naval Architecture and Ocean Engineering, Huazhong University of Science and Technology) ;
  • Wang, Jiangchao (School of Naval Architecture and Ocean Engineering, Huazhong University of Science and Technology)
  • Received : 2019.03.14
  • Accepted : 2019.09.19
  • Published : 2020.12.31
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Abstract

Two High Tensile Strength Steel (EH47) plates with thickness of 70 mm were butt-welded together by multi-pass Submerged Arc Welding (SAW), also the hardness and welding residual stress were investigated experimentally. Based on Thermal-Elastic-Plastic Finite Element (TEP FE) computation, the thermal cycles during entire welding process were obtained, and the HAZ hardness of multi-pass butt welded joint was computed by the hardenability algorithm with considering microstructure evolution. Good agreement of HAZ hardness between the measurement and computational result is observed. The evolution of each phase was drawn to clarify the influence mechanism of thermal cycle on HAZ hardness. Welding residual stress was predicted with considering mechanical response, which was dominantly determined by last cap welds through analyzing its formation process.

Keywords

Acknowledgement

This study was supported by the National Natural Science Foundation of China (Grant No. 51609091), Priority Academic Program Development of Jiangsu Higher Education Institutions and Collegiate Natural Science Fund of Jiangsu Province (14KJA570001) and Collegiate Natural Science Fund Major project of Jiangsu Province (2014CH096J).

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