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Method for evaluating the ductile fracture properties of steel parent material and weld metal

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Abstract

In collision accidents, ductile fracture may occur in base metal or weld metal without evident defects. We propose a test method for evaluating the initiation and growth behavior of internal ductile cracks in metals, particularly in high-strength steel materials. In previous studies, the internal ductile crack initiation behaviors in steel were evaluated considering the effect of stress triaxiality on the critical equivalent plastic strain using some round bar specimens, where each specimen had a different circumferential notch in size. However, it is difficult to observe a transition process from crack initiation to growth and measure crack driving force parameters in high-strength steels, because ductile cracks grow abruptly soon after their initiation. Accordingly, to investigate the ductile crack initiation and growth behavior, we developed two stress triaxiality–controlled specimens with a mechanism to decelerate the propagation rate of ductile cracks. The applicability of these specimens to the evaluation of ductile crack initiation condition was discussed based on the results of tensile fracture tests used on three types of steels and one weld metal and finite element analyses. The ductile crack initiation limits of the weld metal widely varied compared to the base metal and were comparable to or significantly lower than those of the base metals in this study.

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Authors and Affiliations

  1. Nippon Steel Corporation, 20-1 Shintomi, Futtsu-Shi, Chiba, Japan

    Asato Hatamoto & Hiroshi Shimanuki

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  1. Asato Hatamoto
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  2. Hiroshi Shimanuki
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Correspondence to Asato Hatamoto.

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Recommended for publication by Commission X - Structural Performances of Welded Joints - Fracture Avoidance.

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Hatamoto, A., Shimanuki, H. Method for evaluating the ductile fracture properties of steel parent material and weld metal. Weld World 67, 1595–1605 (2023). https://doi.org/10.1007/s40194-023-01512-8

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