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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• 作者：W. Wu ; M.-L. Zhu ; X. Liu and F.-Z. Xuan
• 刊名：Fatigue & Fracture of Engineering Materials & Structures
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：40
• 期：1
• 页码：45-54
• 全文大小：1955K
• ISSN：1460-2695

文摘

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 °C. The S–N curve at room temperature shows a duplex shape, while the S–N curve at 370 °C is continuously decreasing with lower fatigue strength. The welds at 370 °C 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.