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首页> 外文期刊>Fatigue & Fracture of Engineering Materials & Structures >Effect of temperature on high-cycle fatigue and very high cycle fatigue behaviours of a low-strength Cr-Ni-Mo-V steel welded joint
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Effect of temperature on high-cycle fatigue and very high cycle fatigue behaviours of a low-strength Cr-Ni-Mo-V steel welded joint

机译：温度对低强度Cr-Ni-Mo-V钢焊接接头高周疲劳和超高周疲劳行为的影响

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摘要

Axially push-pull fatigue tests of a low-strength Cr-Ni-Mo-V steel welded joint were conducted up to very high cycle fatigue regime at room temperature and 370 ℃. The S-N curve at room temperature shows a duplex shape, while the S-N curve at 3 70 ℃ is continuously decreasing with lower fatigue strength. The welds at 370 ℃ undergoes dynamic strain ageing and has an enhanced load-defects interaction, leading to equal distribution of failures among different parts of the welds. The Z parameter model, with micro-defect location incorporated, having sound physical representation, is life-controlling of the welds at high temperature.
机译：对低强度Cr-Ni-Mo-V钢焊接接头进行了轴向推挽疲劳试验，在室温和370℃下进行了非常高的循环疲劳试验。室温下的S-N曲线呈双曲线，而3 70℃下的S-N曲线则随着疲劳强度的降低而连续下降。焊缝在370℃时会经历动态应变时效，并具有增强的载荷－缺陷相互作用，从而在焊缝的不同部位之间均匀分布故障。 Z参数模型结合了微缺陷位置，具有良好的物理表示，可以控制高温下的焊缝寿命。

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  • 作者

    W. WU; M.-L. ZHU; X. LIU; F.-Z. XUAN;

  • 作者单位

    Key Laboratory of Pressure Systems and Safety, Ministry of Education School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China;

    Key Laboratory of Pressure Systems and Safety, Ministry of Education School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China;

    Shanghai Turbine Plant of Shanghai Electric Power Generation Equipment Co., Ltd., Shanghai, 200240, China;

    Key Laboratory of Pressure Systems and Safety, Ministry of Education School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China;

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  • 正文语种 eng
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  • 关键词

    fatigue crack initiation; fatigue strength evaluation; temperature effect; very high cycle fatigue; welded joint;

    机译：疲劳裂纹萌生疲劳强度评估;温度效应极高的循环疲劳;焊接接头;

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