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Influence of Heat Input on Microstructure and Corrosion Resistance of Underwater Wet-Welded E40 Steel Joints

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Abstract

Heat input has a significant effect on the microstructure and corrosion performance for welded joints. Underwater wet welding (UWW) was applied to high-strength low-alloy steels E40 with different heat inputs. Corrosion performance of the base metal (BM), weld metal (WM), and heat-affected zone (HAZ) was investigated by the electrochemical techniques including electrochemical impedance spectroscopy and potentiodynamic polarization tests emerged in 3.5 wt.% NaCl solution. The results indicated that corrosion resistance of WM decreases with increasing heat input when the welding speed remains constant. Compared with arc voltage and welding current used in UWW, welding speed plays a more important role in the corrosion behavior of WM. The excessive welding speed can cause severe deterioration of corrosion resistance of WM. Meanwhile, the WM indicates the better corrosion resistance than the HAZ and the BM for the sample 2 with a heat input of 2.5 kJ/mm, and the worst corrosion resistance appears in the BM. The critical role of microstructure, grain size, grain boundary and crystal orientation in the corrosion resistance was discussed by optical microscope and electron backscatter diffraction techniques.

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Acknowledgments

The thanks are expressed to the financial support of the National Key Research and Development Program of China (2016YFB0300602), the National Natural Science Foundation of China (Grant Nos. U1960102, 51705103, 51475104), and the China Postdoctoral Science Foundation (Grant Nos. 2019TQ0057, 2019M661113).

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Authors and Affiliations

  1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, No. 92 West Dazhi Street, Harbin, 150001, China

    Jianfeng Wang, Yibo Liu & Qingjie Sun

  2. Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, No. 2, West Wenhua Road, Weihai, 264209, China

    Jianfeng Wang, Jiangkun Ma, Yibo Liu, Tao Zhang, Shichao Wu & Qingjie Sun

  3. School of Metallurgy, Northeastern University, Shenyang, 110819, China

    Jianfeng Wang

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  1. Jianfeng Wang
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  4. Tao Zhang
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Correspondence to Qingjie Sun.

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Wang, J., Ma, J., Liu, Y. et al. Influence of Heat Input on Microstructure and Corrosion Resistance of Underwater Wet-Welded E40 Steel Joints. J. of Materi Eng and Perform 29, 6987–6996 (2020). https://doi.org/10.1007/s11665-020-05160-7

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  • DOI: https://doi.org/10.1007/s11665-020-05160-7

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