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Influence of Local Properties on Fatigue Crack Growth of Laser Butt Welds in Thin Plates of High-Strength Low-Alloy Steel
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| In this work, local properties such as hardness and fatigue crack grow rate in the heat‐affected zone of four laser‐welded butt joints in thin high‐strength low‐alloy steel were ex-amined, so as to explain and predict fatigue lives at high stress levels through the fracture mechanics approach. The different welded series presented a similar fatigue crack growth rate in the heat‐affected and fusion zones, but lower than base metal due to the higher hardness of the bainitic–martensitic microstructure verified in the welded series. The results showed that at high stress levels in the as‐welded condition, the fatigue initiation stage can be neglected and assume some types of cracks, with an initial crack of 0.07 mm and appropriate fatigue crack growth rates, estimates of fatigue life close to the experimental results were obtained. | 5.41 MB | Adobe PDF |
Orientador(es)
Resumo(s)
In this work, local properties such as hardness and fatigue crack grow rate in the heat‐affected zone of four laser‐welded butt joints in thin high‐strength low‐alloy steel were ex-amined, so as to explain and predict fatigue lives at high stress levels through the fracture mechanics approach. The different welded series presented a similar fatigue crack growth rate in the heat‐affected and fusion zones, but lower than base metal due to the higher hardness of the bainitic–martensitic microstructure verified in the welded series. The results showed that at high stress levels in the as‐welded condition, the fatigue initiation stage can be neglected and assume some types of cracks, with an initial crack of 0.07 mm and appropriate fatigue crack growth rates, estimates of fatigue life close to the experimental results were obtained.
Descrição
Palavras-chave
fatigue crack growth laser welding high-strength low-alloy steel fatigue life
Contexto Educativo
Citação
Riofrío, P.G.; de Jesus, J.; Ferreira, J.A.M.; Capela, C. Influence of Local Properties on Fatigue Crack Growth of Laser ButtWelds in Thin Plates of High-Strength Low-Alloy Steel. Appl. Sci. 2021, 11, 7346. https://doi.org/10.3390/app11167346.
Editora
MDPI