Quantitative investigation of brittle out-of-plane fracture in X70 pipeline steelReportar como inadecuado




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1 MAT - Centre des Matériaux 2 Arcelor-Mittal

Abstract : Brittle out-of-plane cracking by delamination or brittle tilted fracture affects the impact toughness of pipeline steels. It has been investigated on notched tensile specimens using a local approach to fracture. Smooth and notched bars taken along four directions including the short transverse direction, ND have been tested in tension at temperatures between 20 °C and -196 °C. Delamination partly results from the lower value of the critical cleavage stress along ND, linked to the microtexture anisotropy, but also from the presence of ductile microcracks acting as stress concentrators triggering fracture along the rolling plane. Brittle tilted fracture was associated to a relatively lower value of the critical cleavage stress in that plane, but prior delamination was necessary to trigger it. The relevance of a macroscopic critical stress criterion for delamination is finally discussed.

Keywords : Delamination fracture Brittle tilted fracture Cleavage Anisotropy Microtexture





Autor: Franck Tankoua - Jérôme Crépin - Philippe Thibaux - Steven Cooreman - Anne-Françoise Gourgues-Lorenzon -

Fuente: https://hal.archives-ouvertes.fr/



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