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首页> 外文期刊>ISIJ international >Numerical Simulation on Effect of Microstructure on Hydrogen-induced Cracking Behavior in Duplex Stainless Steel Weld Metal
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Numerical Simulation on Effect of Microstructure on Hydrogen-induced Cracking Behavior in Duplex Stainless Steel Weld Metal

机译：微观结构对双相不锈钢焊接金属致氢抗裂行为效应的数值模拟

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摘要

Duplex stainless steels and their deposited weld metal have ferrite and austenite microstructures with different material properties. In addition, the microstructure of the base metal and weld metal clearly differs, affecting hydrogen diffusion and accumulation, and hydrogen-induced cracking behavior at the micro-structural scale. In this study, the influence of microstructure on hydrogen-induced cracking behavior of the duplex stainless-steel weld metal was investigated. Duplex stainless-steel weld metal specimens were prepared and slow strain rate tensile test was performed after hydrogen charging. Cracks were observed at the ferrite/austenite boundaries. A microstructure-based finite element simulation was performed to clarify the concentration distribution at the microstructural scale. A finite element model based on the cross-section of the microstructure was designed to calculate the stress and hydrogen concentration distribution. The simulation result showed that hydrogen accumulation occurred at the ferrite/austenite boundaries, which corresponded to the locations where cracks were observed. On the other hand, the hydrogen concentration at the accumulation site in the weld metal was lower than that in the base metal. Therefore, the influence of the phase fraction and stress-strain curves of the ferrite and austenite phases on the hydrogen concentration was investigated by the proposed numerical simulation. Both phase fraction and stress-strain curves significantly influenced the microscopic distribution of hydrogen concentration.
机译：双相不锈钢及其沉积的焊接金属具有铁素体和具有不同材料性质的奥氏体微结构。另外，基础金属和焊接金属的微观结构明显不同，影响氢气扩散和积累，以及微结构尺度的氢致裂化行为。在该研究中，研究了微观结构对双相不锈钢焊接金属的氢诱导裂化行为的影响。制备双面不锈钢焊接金属样品，并在氢气充电后进行慢应变速率拉伸试验。在铁氧体/奥氏体边界观察裂缝。进行微观结构的有限元模拟以阐明微观结构尺度的浓度分布。设计了基于微结构的横截面的有限元模型，以计算应力和氢浓度分布。仿真结果表明，在铁素体/奥氏体边界处发生氢气积累，其对应于观察到裂缝的位置。另一方面，焊接金属中累积部位处的氢浓度低于基础金属中的氢浓度。因此，通过提出的数值模拟研究了铁素体和奥氏体相对氢浓度对氢浓度的影响和应变曲线的影响。两相级分和应力 - 应变曲线显着影响了氢浓度的微观分布。

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  • 来源
    《ISIJ international》 |2021年第4期|1236-1244|共9页
  • 作者

    Gen OGITA; Koki MATSUMOTO; Masahito MOCHIZUKI; Yoshiki MIKAMI; Kazuhiro ITO;

  • 作者单位

    Division of Materials and Manufacturing Science Graduate School of Engineering Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan Chiyoda Corporation 4-6-2 Minatomirai Nishi-ku Yokohama 220-8765 Japan;

    Division of Materials and Manufacturing Science Graduate School of Engineering Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan;

    Division of Materials and Manufacturing Science Graduate School of Engineering Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan;

    Joining and Welding Research Institute Osaka University 11-1 Mihogaoka Ibaraki Osaka 567-0047 Japan;

    Joining and Welding Research Institute Osaka University 11-1 Mihogaoka Ibaraki Osaka 567-0047 Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    hydrogen-induced cracking; microstructure; duplex stainless steel; weld metal; elasto-plastic analysis; hydrogen diffusion simulation;

    机译：氢致裂纹;微观结构;双相不锈钢;焊接金属;弹塑性分析;氢气扩散仿真;

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