<strong>DH36</strong>海洋工程钢焊接结构的氢脆敏感性研究

doi:10.11902/1005.4537.2024.079

中国腐蚀与防护学报

2025, Vol. 45

Issue (2): 416-422 CSTR: 32134.14.1005.4537.2024.079 DOI: 10.11902/1005.4537.2024.079

临氢关键材料服役行为研究专刊

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DH36海洋工程钢焊接结构的氢脆敏感性研究

李新城¹, 李兆南¹, 王海锋¹, 徐云泽¹^,²(

), 王明昱¹, 甄兴伟¹

^1.大连理工大学船舶工程学院大连 116024
^2.工业装备结构分析优化与CAE软件全国重点实验室大连 116024

Hydrogen Embrittlement Sensitivity for Welded Structural Parts of DH36 Marine Engineering Steel

LI Xincheng¹, LI Zhaonan¹, WANG Haifeng¹, XU Yunze¹^,²(

), WANG Mingyu¹, ZHEN Xingwei¹

^1.School of Naval Engineering, Dalian University of Technology, Dalian 116024, China
^2.National Key Laboratory of Industrial Equipment Structural Analysis and Optimization and CAE Software, Dalian 116024, China

引用本文:

李新城, 李兆南, 王海锋, 徐云泽, 王明昱, 甄兴伟. DH36海洋工程钢焊接结构的氢脆敏感性研究[J]. 中国腐蚀与防护学报, 2025, 45(2): 416-422.
Xincheng LI, Zhaonan LI, Haifeng WANG, Yunze XU, Mingyu WANG, Xingwei ZHEN. Hydrogen Embrittlement Sensitivity for Welded Structural Parts of DH36 Marine Engineering Steel[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(2): 416-422.

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摘要:

以DH36海洋工程钢的焊接构件为研究对象，通过氢渗透和慢应变速率拉伸试验(SSRT)对DH36钢焊接结构不同区域的氢脆敏感性进行对比研究。结果表明，热影响区的氢扩散系数最大，焊缝区次之，母材区最小；热影响区的氢脆系数最高，且热影响区在极化电位为-950 mV时，可以观察到明显的氢脆现象，而母材区与焊缝区当阴极保护电位为-1050 mV时才表现出氢脆特征。热影响区氢脆敏感性高于焊缝区，而焊缝区高于母材区。

关键词 ： DH36钢, 氢脆, 热影响区, 氢渗透, 慢应变速率拉伸试验(SSRT), 阴极保护

Abstract：

The hydrogen embrittlement sensitivity of different welded structures of DH36 marine engineering steel was comparatively studied via hydrogen diffusion measurement and slow strain rate tests (SSRT). The results show that the hydrogen diffusion coefficient is the highest for the heat-affected zone, followed by the weld zone, and the base metal zone is the lowest. The hydrogen embrittlement coefficient is the highest for the heat-affected zone, and obvious hydrogen embrittlement can be observed in the heat-affected zone by an applied polarization potential of -950 mV, while the base metal and weld zone exhibit hydrogen embrittlement characteristics only when the cathodic protection potential of -1050 mV was applied. The results indicate that the heat-affected zone has higher hydrogen embrittlement sensitivity than the weld zone, however, the weld zone has higher sensitivity than the base metal zone.

Key words： DH36 steel hydrogen embrittlement heat affected zone hydrogen permeation slow strain rate tests (SSRT) cathodic protection

收稿日期: 2024-03-11 32134.14.1005.4537.2024.079

ZTFLH:

TG174

基金资助:国家自然科学基金(52001055)

通讯作者: 徐云泽，E-mail：xuyunze123@163.com，研究方向为船舶与海洋结构物腐蚀与防护

Corresponding author: XU Yunze, E-mail: xuyunze123@163.com

作者简介: 李新城，男，1999年生，硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2024.079 或 https://www.jcscp.org/CN/Y2025/V45/I2/416

图1 母材、热影响区及焊缝区金相图

图2 试样形状及取样区域示意图

图3 拉伸试验装置

图4 电化学充氢装置示意图

图5 焊缝区、热影响区与母材区的氢渗透曲线

表1 焊缝区、热影响区与母材区的氢扩散参数

图6 母材区、焊缝区和热影响区在不同电位下的应力应变曲线及延伸率曲线

图7 母材、热影响区与焊缝区宏观断口形貌图

图8 焊缝区、热影响区和母材区氢脆系数

图9 母材、热影响区和焊缝区在不同电位下拉伸断口形貌图

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