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Roles of Hydrogen Content and Pre-strain on Damage Evolution of TRIP-aided Bainitic Ferrite Steel

机译：氢气含量和菌株对跳闸壳体铁氧体钢损伤演化的作用

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摘要

From the aspect of crack/void initiation and growth characteristics, the effects of pre-strain on the hydrogen embrittlement resistance of a transformation-induced plasticity-aided bainitic ferrite steel were examined. The hydrogen uptake in the specimens without pre-strain caused degradation of crack growth resistance, but the crack initiation probability did not change significantly. It is noteworthy that the degree of degradation was independent of the hydrogen content in the present hydrogen charging condition. Pre-straining to 3% and 6% improved the crack growth resistance of the hydrogen-charged specimens because of a reduction in the probability of austenite presence at the crack tip. Furthermore, a high level of pre-strain provided high hydrogen concentration and resulted in strain-age-hardening, which caused an acceleration of quasi-cleavage fracture, an increase in yield strength, and a stress/strain concentration associated with Luders deformation. These factors diminished the crack initiation resistance and crack growth resistance.
机译：从裂缝/空隙引发和生长特征的方面，研究了预株对转化诱导的塑性辅助贝氏体铁氧体钢的氢脆性抗性的影响。试样的氢吸收而没有预致前的裂纹生长抗性的降解，但裂纹启动概率不会显着变化。值得注意的是，降解程度与本氢充电条件中的氢含量无关。由于奥氏体在裂纹尖端处于奥氏体存在的可能性降低，预紧张预紧张至3％和6％改善了氢带电荷的试样的裂纹生长抗性。此外，高水平的预致氢浓度提供高氢浓度并导致应变症硬化，这导致准切割骨折的加速度，屈服强度的增加，以及与铅变形相关的应力/应变浓度。这些因素减少了裂纹引发抗性和裂纹生长抗性。

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  • 来源
    《ISIJ international》 |2021年第4期|1309-1314|共6页
  • 作者

    Virendra Kumar VERMA; Motomichi KOYAMA; Bakuya KUMAI; Tomohiko HOJO; Eiji AKIYAMA;

  • 作者单位

    Institute for Materials Research Tohoku University Katahira 2-1-1 Aoba-ku Sendai Miyagi 980-8577 Japan Department of Mechanical Engineering Kyushu University Motooka 744 Nishi-ku Fukuoka 819-0395 Japan;

    Institute for Materials Research Tohoku University Katahira 2-1-1 Aoba-ku Sendai Miyagi 980-8577 Japan Elements Strategy Initiative for Structural Materials (ESISM) Kyoto University Yoshida-honmachi Sakyo-ku Kyoto 606-8501 Japan;

    Institute for Materials Research Tohoku University Katahira 2-1-1 Aoba-ku Sendai Miyagi 980-8577 Japan School of Engineering Tohoku University 6-6-01-2 Aramaki Aza Aoba Aoba-ku Sendai 980-8579 Japan;

    Institute for Materials Research Tohoku University Katahira 2-1-1 Aoba-ku Sendai Miyagi 980-8577 Japan;

    Institute for Materials Research Tohoku University Katahira 2-1-1 Aoba-ku Sendai Miyagi 980-8577 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 embrittlement; transformation-induced plasticity; bainitic ferrite; pre-strain; strain aging;

    机译：氢脆;转化诱导的可塑性;贝氏体铁氧体;预伤;菌株老化;

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