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Ultra-high cycle fatigue property of a multiphase steel microalloyed with niobium

机译：铌微合金多相钢的超高周疲劳性能

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摘要

The effect of microstructure on the ultra-high cycle fatigue behavior of a high strength steel microalloyed with niobium (Fe-0.23C-1.73Si-2.24Mn-0.68Cr-0.042Nb) was investigated through ultrasonic fatigue test. The ferrite and martensite (F/M) multiphase structure was obtained by air-cooling treatment, while the bainite and martensite (B/M) multiphase structure was obtained by oil-cooling treatment. The ultra-high cycle fatigue limit (109cycles, σw9) of steel with F/M multiphase structure was 750 MPa, while the σw9of steel with B/M multiphase structure was 900 MPa. In the high cycle regime, cracking occurred at the non-inclusion site in the steel with F/M structure. However, half the specimens cracked at the non-inclusion site, the others cracked at inclusions in the steel with B/M structure. The study clearly underscores that the microstructure had a distinct impact on the ultra-high cycle fatigue behavior of high strength steels. Moreover, the present work demonstrates that the fatigue properties of steel can be optimized by using appropriate heat treatment, which is related to the change in the F/M microstructure to B/M microstructure in an advanced Nb-microalloyed steel.
机译：通过超声疲劳试验研究了组织对铌微合金化高强度钢（Fe-0.23C-1.73Si-2.24Mn-0.68Cr-0.042Nb）的超高循环疲劳行为的影响。通过空冷处理获得铁素体和马氏体（F / M）的多相结构，而通过油冷处理获得贝氏体和马氏体（B / M）的多相结构。 F / M多相结构钢的超高循环疲劳极限（109个循环，σw9）为750 MPa，而B / M多相结构钢的σw9为900 MPa。在高循环状态下，在具有F / M结构的钢中，非夹杂点出现裂纹。但是，一半的试样在非夹杂物处开裂，其他试样在具有B / M结构的钢中的夹杂物处开裂。该研究清楚地表明，显微组织对高强度钢的超高循环疲劳行为具有明显的影响。此外，目前的工作表明，可以通过使用适当的热处理来优化钢的疲劳性能，这与先进的Nb微合金钢中F / M微观结构向B / M微观结构的变化有关。

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  • 来源
    《Materials Science and Engineering》 |2018年第7期|1-8|共8页
  • 作者

    P. Zhao; Z. Liu; F. Du; R.D.K. Misra; C. Zhang; X. Zhou; E. Yan;

  • 作者单位

    College of Materials Science and Engineering, Qingdao University of Science & Technology;

    College of Materials Science and Engineering, Qingdao University of Science & Technology;

    College of Materials Science and Engineering, Qingdao University of Science & Technology;

    Laboratory for Excellence in Advanced Steel Research, Department of Metallurgical, Materials and Biomedical Engineering, University of Texas;

    School of Materials Science and Engineering, Tsinghua University;

    School of Materials Science and Engineering, Tsinghua University;

    School of Materials Science and Engineering, Guilin University of Electronic Technology;

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  • 正文语种 eng
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  • 关键词

    Ultra-high cycle fatigue; Nb-microalloyed high strength steel; Multiphase microstructure; Non-inclusion induced crack;

    机译：超高周疲劳;铌微合金高强度钢;多相组织;非夹杂物引起的裂纹;

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