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Time-dependent deformation and fracture of steel between 20°C and 400°C

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Abstract

The time-dependent deformation and cracking behavior of the quenched and tempered steel 15 NiCuMoNb 5 was investigated in the temperature range 20°C to 400°C. Fracture mechanics tests were carried out under various loading conditions including load-hold times of up to three weeks. The time-dependent crack growth can be described by the crack resistance (J R-) curve. Only above 300°C, the J R-curves obtained from constant-load tests start to deviate substantially from constant-displacement-rate tests. In this temperature range, the C t-parameter, which has been developed for creep crack growth testing, can be used to describe crack growth rates. For practical purposes, it is important to note that hold-time effects reduce the load-bearing capacity of cracked specimens by less than 10 percent for the present material and testing conditions.

Résumé

On a étudié la déformation en fonction du temps et le comportement à la fissuration entre 20 et 400°C de l'acier trempé et revenu 15 NiCuMoNb 5. On a procédé à des essais de mécanique de rupture sous diverses conditions de mise en charge, y compris un maintien de la charge sur des durées allant jusqu'à trois semaines. On peut décrire la croissance en fonction du temps de la fissure par la courbe de résistance à la fissuration J R. Ce n'est qu'au delà de 300°C que les courbes J R obtenues par des essais à charge constante commencent à dévier de manière substantielle de celles obtenues par des essais à vitesse de déplacement constante. Dans cette gamme de température, le paramètre Ct qui a été conçu pour les essais de croissance de fissures de fluage, peut être utilisé pour décrire la vitesse de croissance de la fissure. Pratiquement, il est intéressant de noter que les effets de maintien de la charge sont de réduire la capacité de portance des échantillons fissurés de moins de 10%, et ceci pour les conditions de matériaux et d'essais adoptées.

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  1. Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, D-4000, Düsseldorf, FRG

    V. Kuhnle & H. Riedel

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  1. V. Kuhnle
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  2. H. Riedel
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Kuhnle, V., Riedel, H. Time-dependent deformation and fracture of steel between 20°C and 400°C. Int J Fract 34, 179–194 (1987). https://doi.org/10.1007/BF00019716

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  • DOI: https://doi.org/10.1007/BF00019716

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