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Brittle-to-ductile transition in steels and the critical transition temperature

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Abstract

Specimens of different thickness made of a low-alloy steel were tested to determine fracture toughness under static and impact loading at room and low temperatures. It was found that for the specimen of each thickness there was a specific brittle-to-ductile transition temperature Tpsdefined as the upper temperature boundary up to which plane-strain conditions were valid at fracture. The temperature Tps, as well as the brittleness transition temperature T 50 (determined via the 50% ductile component of the fracture surface), rose with the increase in the thickness B of a specimen. The value of Tpswas found to be in a linear dependence on lgB for both static and impact loading.

Résumé

On a procédé à l'essai d'éprouvettes de différentes épaisseurs réalisées en acier faiblement allié en vue de déterminer la ténacité à la rupture sous charge statique et d'impact à température ambiante et à basse température. On a trouvé que pour les éprouvettes correspondantes à chaque épaisseur, il existait une température de transition spécifique ductile-fragile Tps, définie comme la limite supérieure de température sous laquelle les conditions d'état plan de déformation sont atteintes à la rupture. La température Tpsainsi que la température de transition de fragilité T50, correspondant à une surface de rupture présentant 50% de ductilité, se relèvent avec un accroissement de l'épaisseur B de l'éprouvette. La valeur de Tps a été trouvée en dépendance linéaire du lgB à la fois en contrainte statique et en contrainte d'impact.

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Krasowsky, A.J., Kashtalyan, Y.A. & Krasiko, V.N. Brittle-to-ductile transition in steels and the critical transition temperature. Int J Fract 23, 297–315 (1983). https://doi.org/10.1007/BF00020697

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