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首页> 外文期刊>Materials Science and Engineering >Microscopic examination of striation spacing during ductile crack growth in Fe-3wt%Si single-crystalline thin plates in air and hydrogen
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Microscopic examination of striation spacing during ductile crack growth in Fe-3wt%Si single-crystalline thin plates in air and hydrogen

机译：在空气和氢气中Fe-3wt％Si单晶薄板中延性裂纹生长过程中抗延伸间距的显微镜检查

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摘要

Microscopic features of crack growth in thin plates of single-crystalline Fe-3wt%Si alloy in both air and hydrogen environments were investigated by electron channeling contrast imaging (ECCI), electron backscattering diffraction (EBSD), as well as scanning electron microscopy fractography. The goal was to elucidate the discontinuous crack growth as well as the constant unit distance of crack extension (striation spacing). Center-cracked specimens were tested under a sustained load in a hydrogen environment, while they were under continuous stretching in the air environment. The following results were obtained. (1) Striation is formed by extensive slips emitted from the crack tip, mainly contributed from specific (112)[111] and (T12)[111] slip systems. The discontinuous crack growth is mainly caused by interaction of the crack and (112)[111] and (112) [111] slip bands/cell walls formed ahead of the crack tip. These slip bands/cells show that the spacing between slip bands/cells is constant and independent of the crack length. Hence, the striation spacing is the same as that of the slip bands/cells ahead of the crack tip. (2) Hydrogen may affect the slip behavior by reducing the spacing between slip bands/cells ahead of the crack tip compared to that in the air environment.
机译：通过电子通道对比度成像（ECCI），电子反向散射衍射（EBSD），对两个空气和氢气环境中的单晶Fe-3wt％Si合金中单晶Fe-3wt％Si合金的薄板的显微特征。目标是阐明不连续的裂缝增长以及裂缝延伸的恒定单位距离（条纹间距）。在氢气环境中的持续载荷下测试中心破裂的标本，而它们在空气环境中连续拉伸。获得了以下结果。 （1）通过从裂缝尖端发射的大量滑动，主要从特异性（112）[111]和（T12）[111]滑动系统产生抗锯齿。不连续的裂缝生长主要是由裂缝和（112）的相互作用引起的（112）[111]和（112）[111]在裂纹尖端的前方形成的滑条/细胞壁。这些滑动带/电池表明滑动带/电池之间的间隔是恒定的并且与裂缝长度无关。因此，突变间隔与裂缝尖端前方的滑带/电池的间隔相同。 （2）通过在空气环境中减少裂缝尖端的滑条/电池之间的间距，氢气可能影响滑动行为。

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  • 来源
    《Materials Science and Engineering》 |2021年第20期|140652.1-140652.10|共10页
  • 作者

    Thanh Thuong Huynh; Shigeru Hamada; Kaneaki Tsuzaki; Hiroshi Noguchi;

  • 作者单位

    Department of Mechanical Engineering Can Tho University Campus II Ninh Kieu District Can Tho Viet Nam Graduate School of Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan;

    Department of Mechanical Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan;

    Department of Mechanical Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan Research Center for Structural Materials National Institute for Materials Science 1-2-1 Sengen Tsukuba 305-0047 Japan Elements Strategy Initiative for Structural Materials (ESISM) Kyoto University Yoshida-honmachi Sakyo-ku Kyoto 606-8501 Japan;

    Department of Mechanical Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan;

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  • 正文语种 eng
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  • 关键词

    Ductile crack growth; Hydrogen; Steel; Delayed fracture; Plastic strain; Dislocation; Single crystal;

    机译：韧性裂纹生长;氢;钢;延迟骨折;塑料应变;错位;单晶;

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