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首页> 外文期刊>ISIJ international >3D Fracture Behaviours in Dual-phase Stainless Steel
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3D Fracture Behaviours in Dual-phase Stainless Steel

机译：双相不锈钢中的3D断裂行为

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摘要

Single-distance phase retrieval technique was applied to contrast-enhanced phase-sensitive imaging of dual-phase microstructures in ferrite/austenite dual-phase stainless steel. Contrast between the two phases was evaluated, together with noise and spatial resolution, under varying experimental and phase retrieval conditions. Serial sectioning technique was also employed, to validate the shape accuracy of related three-dimensional images. Although the density difference between the two phases was relatively small, the two phases were successfully segmented in the three-dimensional images. The imaging technique was also applied to observe microvoid nucleation and growth behaviour during tensile loading. The loading steps at which microvoids were nucleated were identified by tracking all the microvoids observed at the final loading step, in reverse chronological order, toward the initial unloaded state. Each absorption-contrast image was then registered with a corresponding phase-contrast image, in order to classify all the targeted microvoids according to their nucleation site: ferrite, austenite or phase boundary. Premature damage initiation was observed at a relatively early stage at all the nucleation sites; however, subsequent growth was relatively moderate. On the other hand, microvoids initiated later, at fine particles located along the phase boundaries, exhibited enormous growth, thereby inducing the final rupture. It was concluded that the substantial driving force for the growth of microvoids located along morphologically characteristic austenitic particles was the predominant factor in the ductile fracture.
机译：将单距相检索技术应用于铁氧体/奥氏体双相不锈钢中双相组织的对比增强相敏成像。在不同的实验和相位检索条件下，评估了两个相位之间的对比度以及噪声和空间分辨率。还采用了串行切片技术，以验证相关三维图像的形状精度。尽管两相之间的密度差相对较小，但是在三维图像中成功地将了两相分割。该成像技术还用于观察拉伸载荷期间微孔成核和生长行为。通过以相反的时间顺序向初始的未加载状态跟踪在最终加载步骤中观察到的所有微孔，来确定微孔成核的加载步骤。然后，将每个吸收对比图像与相应的相位对比图像配准，以便根据它们的成核位置对所有目标微孔进行分类：铁素体，奥氏体或相界。在相对较早的阶段，在所有成核位置都观察到过早的损伤开始；然而，随后的增长相对温和。另一方面，随后在沿相边界定位的细颗粒处引发的微孔表现出巨大的增长，从而导致最终破裂。结论是，沿形态特征奥氏体颗粒定位的微孔生长的主要驱动力是延性断裂的主要因素。

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  • 来源
    《ISIJ international》 |2016年第5期|883-892|共10页
  • 作者

    Hiroyuki TODA; Fukuto TOMIZATO; Ryo HARASAKI; Dowon SEO; Masakazu KOBAYASHI; Akihisa TAKEUCHI; Kentaro UESUGI;

  • 作者单位

    Department of Mechanical Engineering, 3D/4D Structural Materials Research Centre, Kyushu University, Motooka 744, Nishi-ward, Fukuoka City, Fukuoka, 819-0395 Japan;

    Department of Mechanical Engineering, Toyohashi University of Technology, Hibarigaoka 1-1, Tempaku, Toyohashi, Aichi, 441-8580 Japan;

    Department of Mechanical Engineering, Toyohashi University of Technology, Hibarigaoka 1-1, Tempaku, Toyohashi, Aichi, 441-8580 Japan;

    Department of Mechanical Engineering, 3D/4D Structural Materials Research Centre, Kyushu University, Motooka 744, Nishi-ward, Fukuoka City, Fukuoka, 819-0395 Japan;

    Department of Mechanical Engineering, Toyohashi University of Technology, Hibarigaoka 1-1, Tempaku, Toyohashi, Aichi, 441-8580 Japan;

    Japan Synchrotron Radiation Research Institute, Kouto 1-1-1, Sayo-cho, Sayo-gun, Hyogo, 679-5148 Japan;

    Japan Synchrotron Radiation Research Institute, Kouto 1-1-1, Sayo-cho, Sayo-gun, Hyogo, 679-5148 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

    dual-phase material; stainless steel; microtomography; phase-contrast imaging; microvoid; ductile fracture;

    机译：双相材料不锈钢;显微断层扫描相衬成像微孔韧性断裂;

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