Hydrogen Diffusion Simulation of X80 Steel under Residual Stress of Repair Welding

MENG Bufan; ZHAO Jianping

doi:10.7512/j.issn.1001-2303.2023.06.13

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Hydrogen Diffusion Simulation of X80 Steel under Residual Stress of Repair Welding
Vol. 53, Issue 6, Pages: 83-91(2023)
DOI： 10.7512/j.issn.1001-2303.2023.06.13

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孟不凡，赵建平.X80钢补焊残余应力影响下的氢扩散模拟［J］.电焊机，2023，53（6）：83-91.

MENG Bufan, ZHAO Jianping.Hydrogen Diffusion Simulation of X80 Steel under Residual Stress of Repair Welding[J].Electric Welding Machine, 2023, 53(6): 83-91.
孟不凡，赵建平.X80钢补焊残余应力影响下的氢扩散模拟［J］.电焊机，2023，53（6）：83-91. DOI： 10.7512/j.issn.1001-2303.2023.06.13.

MENG Bufan, ZHAO Jianping.Hydrogen Diffusion Simulation of X80 Steel under Residual Stress of Repair Welding[J].Electric Welding Machine, 2023, 53(6): 83-91. DOI： 10.7512/j.issn.1001-2303.2023.06.13.

摘要

通过有限元软件ABAQUS建立了X80钢三维补焊模型，综合考虑焊接残余应力和组织不均匀性的影响，采用顺序间接耦合方法，对平板补焊的温度场、应力场和氢扩散进行耦合计算。研究了在不同补焊热输入条件下的补焊残余应力变化规律。结果表明：补焊后最大残余应力出现在补焊焊缝区域，横向残余应力S11应力峰值增加55%，纵向残余应力S22超过材料屈服强度。不同补焊热输入对S11影响较大。无残余应力影响时氢扩散呈现梯度分布，有应力影响时，氢在残余应力集中区域浓度较大，残余应力促进了氢的扩散和聚集。

Abstract

A three-dimensional repair welding model of X80 steel was established by using the finite element software ABAQUS. Considering the influence of welding residual stress and microstructure inhomogeneity, the temperature field, stress field and hydrogen diffusion of plate repair welding were coupled by using the sequential indirect coupling method. The variation of residual stress in repair welding under different heat input conditions was studied. The results show that the maximum residual stress after repair welding occurs in the weld zone, the peak stress of transverse residual stress S11 increases by 55%, and the longitudinal residual stress S22 exceeds the yield strength of the material. The S11 is greatly affected by different heat input of repair welding. When there is no residual stress, hydrogen diffusion presents a gradient distribution. When there is stress, hydrogen concentration is large in the residual stress concentration area, and the residual stress promotes the diffusion and enrichment of hydrogen.

关键词

X80钢补焊残余应力氢扩散

Keywords

X80 steelrepair weldingresidual stresshydrogen diffusion

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