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HAN Xiaohui, YANG Zhibin, ZHANG Zhiyi, LEI Zhen, SHI Chunyuan. Effects of heat input on the intercrystalline corrosion sensitivity of laser overlapped welded stainless steel joints[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(4): 148-153. DOI: 10.12073/j.hjxb.2019400116
Citation: HAN Xiaohui, YANG Zhibin, ZHANG Zhiyi, LEI Zhen, SHI Chunyuan. Effects of heat input on the intercrystalline corrosion sensitivity of laser overlapped welded stainless steel joints[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(4): 148-153. DOI: 10.12073/j.hjxb.2019400116
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Effects of heat input on the intercrystalline corrosion sensitivity of laser overlapped welded stainless steel joints

  • 1. Technical Engineering Department，CRRC Qingdao Sifang Co., Ltd., Qingdao 266111, China;

  • 2. School of Material Science and Engineering, Dalian Jiaotong University, Dalian 116028, China;

  • 3. Harbin Welding Institute Limited Company, Harbin 150028, China

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  • Received Date: December 11, 2017
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    • Abstract
  • Effects of heat input on the intercrystalline corrosion sensitivity of laser overlapped welded stainless steel joints were studied by double-loop electrochemical potentiokinetic reactivation (DL-EPR) method. The phase composition and the main alloy composition of the joints were examined with X-ray diffractometer, scanning electron microscopy and energy dispersive spectrometer. The results indicated that the intercrystalline corrosion of the joints was more sensitive than that of base metal. Increasing the heat input, the passivation range of the anode polarization curves was gradually narrowed, the maintaining passivity current density and the reactivation rate was increased, which indicated that the intercrystalline corrosion sensitivity was increased. Compared to the weld seam, the intercrystalline corrosion tendency of the heat affected zone was more obvious. The heat affected zone was the weakest zone of the joint in the performance of intergranular corrosion resistance, and the main reason of the increased intercrystalline corrosion sensitivity was grain boundary poor chromium because of M23C6 separated out on the grain boundary.
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