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首页> 外文期刊>Materials Science and Engineering >Visualization of hydrogen gas evolution during deformation and fracture in SCM 440 steel with different tempering conditions
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Visualization of hydrogen gas evolution during deformation and fracture in SCM 440 steel with different tempering conditions

机译：不同回火条件下SCM 440钢变形和断裂过程中氢气释放的可视化

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摘要

In the present study, the hydrogen gas evolution behavior was investigated in SCM 440 steel by using a hydrogen microprint technique (HMT) and a testing machine equipped with a quadrupole mass spectrometer (QMS) in a ultrahigh vacuum (UHV) atmosphere. SCM 440 steels prepared by varying the tempering temperature over the range 200-700℃ were evaluated in order to elucidate the relationship between the hydrogen gas evolution and the tempered microstructures in the deformation. Cathodic hydrogen charging was carried out with a current density of 100 A/m~2 for 1 h at room temperature. For comparison, a tensile specimen was prepared without hydrogen charging. The HMT showed that silver particles, which are indicative of the hydrogen emission sites, were present mainly in the matrix as well as on the slip lines after the deformation. It is believed that the silver particles on the slip lines represent the effect of hydrogen transportation due to mobile dislocations. In addition, accumulation of silver particles around non-metallic inclusions such as Al_2O_3 was also identified. This tendency was observed for different tempering conditions. From the relationship between the stress-strain curves and the hydrogen evolution, determined by using QMS under a UHV atmosphere, it was found that the hydrogen gas evolution behavior varied with the deformation stage.
机译：在本研究中，通过在超高真空（UHV）气氛中使用氢显微打印技术（HMT）和配备四极杆质谱仪（QMS）的测试机，研究了SCM 440钢中的氢气逸出行为。对通过在200-700℃范围内改变回火温度而制备的SCM 440钢进行了评估，以阐明变形过程中氢气释放与回火显微组织之间的关系。在室温下以100 A / m〜2的电流密度对氢进行阴极充电1 h。为了比较，制备了不带氢的拉伸试样。 HMT表明，指示氢释放位置的银颗粒主要存在于基体中以及变形后的滑移线上。据信，由于移动位错，滑移线上的银颗粒代表氢传输的影响。此外，还发现了银颗粒在非金属夹杂物如Al_2O_3周围的聚集。对于不同的回火条件观察到了这种趋势。根据在超高压气氛下使用QMS确定的应力-应变曲线与析氢之间的关系，发现氢气的析出行为随变形阶段而变化。

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  • 来源
    《Materials Science and Engineering》 |2012年第1期|p.495-503|共9页
  • 作者

    Keitaro Horikawa; Nobuaki Ando; Hidetoshi Kobayashi; Wataru Urushihara;

  • 作者单位

    Department of Mechanical Science and Bioengineering, School of Engineering Science, Osaka University, Toyonaka 560-S531, Japan;

    Department of Mechanical Science and Bioengineering, School of Engineering Science, Osaka University, Toyonaka 560-S531, Japan;

    Department of Mechanical Science and Bioengineering, School of Engineering Science, Osaka University, Toyonaka 560-S531, Japan;

    Surface Design & Corrosion Research Section, Materials Research Laboratory, Kobe Steel, Ltd., Kobe 651-2271, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    SCM steel; hydrogen; mass spectrometry; hydrogen microprint; deformation;

    机译：单片机钢;氢;质谱;氢显微照片形变;

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