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Investigation of hydrogen embrittlement in 12Cr2Mo1R(H) steel

机译：12Cr2Mo1R（H）钢中氢脆的研究

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摘要

The hydrogen embrittlement of 12Cr2Mo1R(H) steel at different strain rates were investigated after hydrogen precharging for 4 h in a 0.5 M H2SO4 solution with 2 g/L ammonium thiocyanate. Results showed that the embrittlement index increased and gradually reached a relative stable value of about 20% at the strain rate of 5 x 10(-5) s(-1) with the decrease of strain rates. SEM images depicted small and deep flakes at high strain rates, while flakes grew larger at slow strain rates. Most hydrogen-induced cracks (HICs) were transgranular fracture through lath grain of bainitic ferrite. High strain field surrounds the crack tips, which makes the crack tips of two close and parallel cracks deflect toward each another and even form crack coalescence. The electron backscatter diffraction technique was used to investigate the effects of grain boundaries, recrystallization fraction, kernel average misorientation map, texture component, and coincidence site lattice boundaries on the HIC propagation. High densities of dislocations and strain concentrations were found around the cracks, where grains are highly sensitive to HIC.
机译：在含2 g / L硫氰酸铵的0.5 M H2SO4溶液中预充氢4 h后，研究了12Cr2Mo1R（H）钢在不同应变速率下的氢脆。结果表明，在5 x 10（-5）s（-1）的应变速率下，随着应变速率的降低，脆化指数增加并逐渐达到约20％的相对稳定值。 SEM图像描绘了高应变率下的小而深的薄片，而低应变率下的薄片长了。大部分氢致裂纹（HIC）是通过贝氏体铁素体的板条晶粒经晶粒断裂。高应变场围绕裂纹尖端，这使得两个闭合且平行的裂纹的裂纹尖端相互偏斜，甚至形成裂纹合并。用电子背散射衍射技术研究了晶界，重结晶分数，核平均取向差图，织构成分和重合位点晶格边界对HIC传播的影响。在裂纹周围发现了高密度的位错和应变集中，而裂纹对HIC高度敏感。

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  • 来源
    《Journal of Materials Research》 |2018年第20期|3501-3511|共11页
  • 作者

    Luo Xiaowei; Bian Bin; Zhang Kun; Tian Danlei; Pan Min; Chen Xiaolang; Zhao Heming;

  • 作者单位

    Southwest Jiaotong Univ, Sch Mat Sci & Engn, Chengdu 610031, Sichuan, Peoples R China;

    Univ Western Ontario, Dept Mech & Mat Engn, London, ON N6A 3K7, Canada;

    Southwest Jiaotong Univ, Sch Mat Sci & Engn, Chengdu 610031, Sichuan, Peoples R China;

    Southwest Jiaotong Univ, Sch Mat Sci & Engn, Chengdu 610031, Sichuan, Peoples R China;

    Southwest Jiaotong Univ, Key Lab Adv Technol Mat, Minist Educ, Chengdu 610031, Sichuan, Peoples R China;

    Southwest Jiaotong Univ, Key Lab Adv Technol Mat, Minist Educ, Chengdu 610031, Sichuan, Peoples R China;

    Xinyu Iron & Steel Grp Co Ltd, Ctr Technol, Xinyu 338001, Peoples R China;

  • 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);
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  • 正文语种 eng
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