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Study on high-cycle fatigue fracture mechanism and strength prediction of RuT450

机译：RUT450高周疲劳断裂机制及力预测研究

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摘要

Fatigue failure is the most common failure mode of structural materials. In this study, the high-cycle fatigue properties at different temperatures, fracture surface morphologies and corresponding damage mechanisms of a widely used vermicular graphite cast iron RuT450 were investigated. It is found that the fatigue strength values are 150 MPa, 143 MPa and 108 MPa for room temperature, 400 °C and 500 °C, respectively. The decrease rate of fatigue strength is affected by the change of morphology. At high temperature, the proportion of pearlite decreases and graphite becomes blunt. In general, the cracks initiate from the graphite phase boundary and propagate through the pearlite lamellae. In addition, according to the change of matrix micro-structure and crack growth processes under different temperature conditions, and by the quantitative analysis of micro-structure, the effect of temperature can be transformed into related parameters of matrix. Based on the changes, a fatigue strength prediction model for vermicular graphite cast iron at different temperatures was proposed, which predicts the trend well.
机译：疲劳失效是结构材料最常见的故障模式。在该研究中，研究了不同温度下的高循环疲劳性能，裂缝表面形貌和广泛使用的蠕虫石墨铸铁RUT450的相应损伤机制。发现疲劳强度值为室温，400℃和500℃的室温为150MPa，143MPa和108MPa。疲劳强度的降低率受到形态变化的影响。在高温下，珠光体的比例降低，石墨变得钝。通常，裂缝从石墨相边界引发并通过珠光体薄片传播。另外，根据基质微结构和裂纹生长过程的变化，不同的温度条件下，通过微结构的定量分析，可以将温度的效果转化为基质的相关参数。基于变化，提出了一种不同温度下蠕虫石墨铸铁的疲劳强度预测模型，预测了趋势。

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  • 来源
    《Materials Science and Engineering》 |2021年第21期|141599.1-141599.9|共9页
  • 作者

    Mengxiao Zhang; Jianchao Pang; Lingjian Meng; Shouxin Li; Qingyi Liu; Ailong Jiang; Zhefeng Zhang;

  • 作者单位

    Shi-changxu Innovation Center for Advanced Materials Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 PR China;

    Shi-changxu Innovation Center for Advanced Materials Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 PR China;

    Shi-changxu Innovation Center for Advanced Materials Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 PR China;

    Shi-changxu Innovation Center for Advanced Materials Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 PR China;

    Weichai Power Co. Ltd. Weifang 261061 PR China;

    Weichai Power Co. Ltd. Weifang 261061 PR China;

    Shi-changxu Innovation Center for Advanced Materials Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 PR China;

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

    Vermicular graphite cast iron; Microstructures; High-cycle fatigue; Fracture mechanism; Fatigue strength prediction;

    机译：蠕虫石墨铸铁;微观结构;高循环疲劳;骨折机制;疲劳强度预测;

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