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Fatigue crack growth behavior of the simulated HAZ of 800 MPa grade high-performance steel

机译：800 MPa级高性能钢模拟热影响区的疲劳裂纹扩展行为

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摘要

The present study focuses on the fatigue properties in the weld heat-affected zone (HAZ) of 800 MPa grade high-performance steel, which is commonly used in bridges and buildings. Single- and multi-pass HAZs were simulated by the Cleeble system. Fatigue properties were estimated using a crack propagation test under a 0.3 stress ratio and 0.1 load frequencies. The microstructures and fracture surfaces were analyzed by optical microscopy, scanning electron microscopy, and transmission electron microscopy. The results of the crack propagation test showed that the fatigue crack growth rate of coarse-grained HAZ (CGHAZ) was faster than fine-grained HAZ (FGHAZ), although both regions have identical fully martensite microstructures, because FGHAZ has smaller prior austenite grain and martensite packet sizes, which can act as effective barriers to crack propagation. The fatigue crack growth rate of inter-critically reheated CGHAZ (ICCGHAZ) was the fastest among local zones in the HAZ, due to rapid crack initiation and propagation via the massive martensite-austenite (M-A) constituent.
机译：本研究的重点是800 MPa级高性能钢的焊接热影响区（HAZ）的疲劳性能，该性能通常在桥梁和建筑物中使用。单次和多次通过热影响区由Cleeble系统模拟。使用裂纹扩展测试在0.3应力比和0.1负载频率下评估疲劳性能。通过光学显微镜，扫描电子显微镜和透射电子显微镜分析显微组织和断裂表面。裂纹扩展测试结果表明，尽管两个区域都具有相同的完全马氏体组织，但粗晶粒热影响区（CGHAZ）的疲劳裂纹扩展速率比细晶粒热影响区（FGHAZ）快，这是因为FGHAZ具有较小的先前奥氏体晶粒和马氏体的尺寸，可以有效地阻止裂纹扩展。跨临界再加热的CGHAZ（ICCGHAZ）的疲劳裂纹扩展速率是热影响区局部区域中最快的，这是由于裂纹的快速萌生和通过大量马氏体-奥氏体（M-A）成分的传播。

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  • 来源
    《Materials Science and Engineering》 |2011年第6期|p.2331-2338|共8页
  • 作者

    Sanghoon Kim; Donghwan Kang; Tae-Won Kim; Jongkwan Lee; Changhee Lee;

  • 作者单位

    Division of Materials Science and Engineering, Hanyang University, 17 Haengdang-dong. Seongdong-gu, Seoul 133-791. Republic of Korea;

    School of Mechanical Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, Republic of Korea;

    School of Mechanical Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, Republic of Korea;

    Research Institute of Industrial Science and Technology, 75-9, Youngcheon. Dongtan, Hwaseong, Cyeonggi-do 445-813. Republic of Korea;

    Division of Materials Science and Engineering, Hanyang University, 17 Haengdang-dong. Seongdong-gu, Seoul 133-791. Republic of Korea;

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  • 正文语种 eng
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  • 关键词

    fatigue crack; high performance steel for bridges and; buildings; local brittle zone; M-A constituent; crack propagation test;

    机译：疲劳裂纹桥梁用高性能钢;以及建筑物;局部脆性区M-A成分;裂纹扩展测试;

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