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- W2015136304 abstract "The effects of temperature on hydrogen assisted fatigue crack propagation are investigated in three steels in the low-to-medium strength range; a low alloy structural steel, a super duplex stainless steel, and a super ferritic stainless steel. Significant enhancement of crack growth rates is observed in hydrogen gas at atmospheric pressure in all three materials. Failure occurs via a mechanism of time independent, transgranular, cyclic cleavage over a frequency range of 0.1–5 Hz. Increasing the temperature in hydrogen up to 80°C markedly reduces the degree of embrittlement in the structural and super ferritic steels. No such effect is observed in the duplex stainless steel until the temperature exceeds 120°C. The temperature response may be understood by considering the interaction between absorbed hydrogen and micro-structural traps, which are generated in the zone of intense plastic deformation ahead of the fatigue crack tip. On étudie les effets de la température sur la propagation assistée par l'hydrogène de fissures par fatigue dans trois aciers du domaine des basses à moyennes résistances mécaniques: un acier structural faiblement allié, un super-acier inoxydable duplex et un super-acier inoxydable ferritique. On observe un renforcement significatif de la vitesse de croissance des fissures dans l'hydrogène à la pression atmosphérique dans les trois matériaux. La rupture se produit par un mécanisme de clivage cyclique, transgranulaire, indépendant du temps. L'augmentation de la température dans l'hydrogène jusqu'à 80°C réduit nettement le taux de fragilisation de l'acier structural et du super-acier ferritique. Un tel effet n'est pas observé dans l'acier inoxydable duplex pour une augmentation de température allant jusqu'à 120°C. La response en température peut s'expliquer en considérant l'interaction entre l'hydrogène absorbé et les pièges microstruturaux engendrés dans la zone de déformation plastique intense en avant de l'extrêmité de la fissure de fatigue. Der Einfluβ der Temperatur auf die wassertoffgeförderte Ausbreitung eines Ermüdungsrisses wird an ddrei Stählen im Bereich niedriger bis mittlerer Festigkeit untersucht: ein niedrig legierter Baustahl, ein rostfreier Super-Duplexstahl und ein rostfreier Super-Ferritstahl. In allen drei Stählen werden unter Wasserstoffgas bei Atmosphärendruck bedeutend gröβere Riβwachstumsraten beobachtet. Der Bruch tritt ein über zeitabhängiges transgranulares zyklisches Spalten. Ansteigende Temperatur im Wasserstoff bis zu 80°C verringert den Versprödungsgrad im Bau- und Ferritstahl. Im Duplexstahl wird ein solcher Effekt nicht beobachtet, es sei denn, die Temperatur überschreitet 120°C. Dieses Temperaturverhalten kann verstanden werden mit der Wechselwirkung zwischen dem absorbierten Wasserstoff und den Einfangstellen in der Mikrostruktur, die in der Zone intensiver plastischer Verformung vor der Ermüdungsriβspitze gebildet werden." @default.
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- W2015136304 date "1992-08-01" @default.
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- W2015136304 title "Temperature effects on the mechanism of time independent hydrogen assisted fatigue crack propagation in steels" @default.
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- W2015136304 doi "https://doi.org/10.1016/0956-7151(92)90192-h" @default.
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