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The mutual effect of hydrogen and cyclic plastic deformation on ductility degradation of X65 reeled-pipeline welded joint

机译：氢气塑性变形对X65卷管焊接接头延展性劣化的相互影响

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摘要

The safe service of reeled-pipeline welded joint subjected to multiple cyclic plastic deformation (CPD) is challenged by hydrogen embrittlement (HE) in the process of gas and petroleum transportation. Therefore, this work aims to study the interrelation of hydrogen and the ductility of X65 reeled-pipeline welded joint with CPD by using electrochemical hydrogen charging. The results showed that hydrogen could lead to the ductility degradation, regardless of whether the CPD process was performed. But the hydrogen-induced ductility degradation for the welded joint with CPD was retarded. When the hydrogen-charging current density was 50 mA/cm2, the hydrogen embrittlement index (I_(UE)) based on the uniform elongation for welded joint with CPD was 0.33, while that of as-welded joint was 0.53, which indicated that CPD process reduced the sensitivity to HE. The morphology of tensile fracture indicated that brittle cracks initiated at the composite oxide inclusion enriched Al-Mg-Ca-S elements, and propagated radially by quasi-cleavage fracture pattern. The CPD process led to the increase of dislocations acting as reversible hydrogen traps, which significantly enhanced the hydrogen content of welded joint from 1.001 ppm to 2.516 ppm. However, the dislocation walls and cells related to the CPD process hindered the diffusion of hydrogen, and homogeneous distribution of dislocations after CPD dispersed trap sites for capturing hydrogen, which played important roles in delaying hydrogen-induced fracture.
机译：在气体和石油运输过程中，氢气脆化（CPD）受到多循环塑性变形（CPD）的卷绕管道焊接接头的安全服务。因此，这项工作旨在通过使用电化学氢气来研究氢气的相互关系和X65卷管焊接接头的延展性与CPD。结果表明，氢气可能导致延展性劣化，无论是否进行CPD过程。但是，通过CPD焊接接头的氢诱导的延展性劣化。当氢气充电电流密度为50mA / cm2时，基于焊接接头的均匀伸长率为CPD的氢脆折射率（I_（UE））为0.33，而AS焊接接头的速度为0.53，表明CPD过程降低了对他的敏感性。拉伸骨折的形态表明，在复合氧化物包合物中引发的脆性裂缝富集的Al-Mg-Ca-S元件，并通过准切割裂缝图案径向繁殖。 CPD过程导致脱位增加作为可逆氢疏水阀的脱位，这显着增强了1.001ppm至2.516ppm的焊接接头的氢含量。然而，与CPD过程相关的位错壁和细胞阻碍了氢气的扩散，并且在CPD分散的捕获胎位后脱位的均匀分布，用于捕获氢气，这在延迟氢诱导的骨折中起重要作用。

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  • 来源
    《Materials Science and Engineering》 |2020年第jul22期|139739.1-139739.9|共9页
  • 作者

    Yuanbo Jiang; Chengning Li; Dongpo Wang; Jiangcheng Liu; Yezheng Li; Xinjie Di;

  • 作者单位

    School of Materials Science and Engineering Tianjin University Tianjin 300350 China;

    School of Materials Science and Engineering Tianjin University Tianjin 300350 China State Key Laboratory of Metal Materia! for Marine Equipment and Application Anshan 114009 China;

    School of Materials Science and Engineering Tianjin University Tianjin 300350 China State Key Laboratory of Metal Materia! for Marine Equipment and Application Anshan 114009 China;

    Tianjin Pipe (Group) Corporation Tianjin 300301 China;

    National Engineering Laboratory for Pipeline Safety Langfang 065000 China;

    School of Materials Science and Engineering Tianjin University Tianjin 300350 China State Key Laboratory of Metal Materia! for Marine Equipment and Application Anshan 114009 China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Welded joint; Cyclic plastic deformation; Electrochemical hydrogen charging; Hydrogen-induced ductility loss; Dislocation configuration;

    机译：焊接接头;循环塑性变形;电化学氢气充电;氢诱导的延性损失;脱位配置;

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