金属热处理 ›› 2024, Vol. 49 ›› Issue (1): 172-178.DOI: 10.13251/j.issn.0254-6051.2024.01.027

• 工艺研究 • 上一篇    下一篇

焊后热处理对S30408/Q345R不锈钢复合板耐蚀性能的影响

刘文明, 张新明, 程新路, 欧阳凯   

  1. 中建安装集团有限公司, 江苏 南京 210023
  • 收稿日期:2023-08-02 修回日期:2023-11-09 发布日期:2024-02-29
  • 作者简介:刘文明(1986—),男,工程师,博士,主要研究方向为先进焊接技术及热处理,E-mail:liuwm_cscec@163.com

Effect of post-weld heat treatment on corrosion resistance of S30408/Q345R stainless steel clad plate

Liu Wenming, Zhang Xinming, Cheng Xinlu, Ouyang Kai   

  1. China Construction Industrial & Energy Engineering Group Co., Ltd., Nanjing Jiangsu 210023, China
  • Received:2023-08-02 Revised:2023-11-09 Published:2024-02-29

摘要: 研究了焊后热处理对S30408/Q345R不锈钢复合板焊接接头的显微组织、耐晶间腐蚀性能、抗应力腐蚀性能的影响。结果表明,经580 ℃×2 h焊后热处理后,焊接接头过渡层焊缝与基层焊缝熔合线附近出现了合金元素扩散,脱碳层范围减小;焊后热处理后,焊接接头的耐晶间腐蚀性能下降,腐蚀裂纹位于焊缝熔合线附近;焊接接头的抗应力腐蚀性能受焊后热处理影响不大,慢应变速率拉伸断裂接头未发现二次断裂,S30408不锈钢覆层应力腐蚀破裂敏感性比值低,应力腐蚀敏感性小。

关键词: 焊后热处理, 不锈钢复合板, 显微组织, 晶间腐蚀, 应力腐蚀

Abstract: Effect of post-weld heat treatment (PWHT) on microstructure, intergranular corrosion resistance and stress corrosion resistance of the weld joint of S30408/Q345R stainless steel clad plates was studied. The results show that after the PWHT (580 ℃ for 2 h), the alloying element diffusion occurs near the fusion line between transition layer weld and base layer weld of the weld joint, and the range of decarburization layer decreases. After the PWHT, the intergranular corrosion resistance of the weld joint decreases, and the corrosion crack is located near the weld fusion line. The PWHT has little influence on the stress corrosion resistance of weld joints. No secondary fracture is found at the tensile fracture of the weld joint, and the stress-corrosion cracking sensitivity ratio of the S30408 stainless steel clad layer is low, showing the stress corrosion sensitivity is small.

Key words: post-weld heat treatment, stainless steel clad plate, microstructure, intergranular corrosion, stress corrosion

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