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Fatigue properties of X80 pipeline steels with ferrite/bainite dual-phase microstructure

机译:具有铁素体/贝氏体双相组织的X80管线钢的疲劳性能

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摘要

Fatigue properties are important parameters for the safety design and security evaluation of gas transmission pipelines. In this work, the fatigue life at different stresses of full-thickness X80 pipeline steel plates with a ferrite/bainite dual-phase microstructure was investigated using a MTS servo-hydraulic universal testing machine; the fatigue crack propagation rate was examined with CT specimens by using an INSTRON 8874 testing machine. Results indicate that fatigue life increases as maximum stress decreases; as the maximum stress decreases to the maximum operating stress (440 MPa), the fatigue life is approximately 4.2 × 10~5 cycles. The fatigue crack of the full-thickness fatigue life specimens is generated at the surface of rolled steel plates and then the crack propagates and grows inward until a fracture is formed. During fatigue crack growth, a transitional turning point appears in the curve of da/dN with ΔK in the Paris region. The transitional turning point that divides the Paris region to two stages is approximately ΔK≌30 MPa m~(1/2). The change in the growth rate (da/dN) is related to the variation of the crack path and in the fracture mode because of the possible microstructural sensitivity of fatigue crack propagation behavior. This study also discussed the effect of duple phase ferrite/bainite microstructure on fatigue crack initiation and propagation.
机译:疲劳特性是输气管道安全设计和安全评估的重要参数。在这项工作中,使用MTS伺服液压万能试验机研究了具有铁素体/贝氏体双相组织的全厚度X80管线钢在不同应力下的疲劳寿命;用INSTRON 8874试验机用CT试样检查疲劳裂纹扩展率。结果表明,疲劳寿命随着最大应力的减小而增加;当最大应力减小到最大工作应力(440 MPa)时,疲劳寿命约为4.2×10〜5个循环。全厚度疲劳寿命试样的疲劳裂纹在轧制钢板的表面产生,然后裂纹向内扩展并生长直至形成断裂。在疲劳裂纹扩展过程中,巴黎地区的da / dN曲线中出现一个过渡转折点,ΔK为ΔK。将巴黎地区分为两个阶段的过渡转折点约为ΔK≌30MPa m〜(1/2)。由于疲劳裂纹扩展行为的可能的微观结构敏感性,增长率(da / dN)的变化与裂纹路径的变化和断裂模式有关。这项研究还讨论了双相铁素体/贝氏体显微组织对疲劳裂纹萌生和扩展的影响。

著录项

  • 来源
    《Materials Science and Engineering》 |2016年第7期|96-103|共8页
  • 作者单位

    Key Lab of Metastable Materials Science & Technology and College of Materials Science & Engineering, Yanshan University, Qinhuangdao 066004, China;

    Key Lab of Metastable Materials Science & Technology and College of Materials Science & Engineering, Yanshan University, Qinhuangdao 066004, China,Key Lab of Applied Chemistry of Hebei Province and School of Environment and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China;

    Key Lab of Applied Chemistry of Hebei Province and School of Environment and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China;

    Key Lab of Metastable Materials Science & Technology and College of Materials Science & Engineering, Yanshan University, Qinhuangdao 066004, China;

    Key Lab of Metastable Materials Science & Technology and College of Materials Science & Engineering, Yanshan University, Qinhuangdao 066004, China;

    Key Lab of Metastable Materials Science & Technology and College of Materials Science & Engineering, Yanshan University, Qinhuangdao 066004, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    X80; Ferrite/bainite dual-phase; Fatigue property; M/A constituent;

    机译:X80;铁氧体/贝氏体双相;疲劳特性;并购构成;

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