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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
Author(s) -
Wu W.,
Zhu M.L.,
Liu X.,
Xuan F.Z.
Publication year - 2017
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/ffe.12471
Subject(s) - welding , materials science , low cycle fatigue , fatigue limit , metallurgy , joint (building) , structural engineering , fatigue testing , high strength steel , composite material , engineering
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.