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arXiv · 1910.07983

On the suitability of slow strain rate tensile testing for assessing hydrogen embrittlement susceptibility

Emilio Martínez-Pañeda·Zachary D. Harris·Sandra Fuentes-Alonso·John R. Scully·James T. Burns
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Abstract

The onset of sub-critical crack growth during slow strain rate tensile testing (SSRT) is assessed through a combined experimental and modeling approach. A systematic comparison of the extent of intergranular fracture and expected hydrogen ingress suggests that hydrogen diffusion alone is insufficient to explain the intergranular fracture depths observed after SSRT experiments in a Ni-Cu superalloy. Simulations of these experiments using a new phase field formulation indicate that crack initiation occurs as low as 40% of the time to failure. The implications of such sub-critical crack growth on the validity and interpretation of SSRT metrics are then explored.

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Emilio Martínez-Pañeda, Zachary D. Harris, Sandra Fuentes-Alonso, John R. Scully, James T. Burns. 2019-10-17. On the suitability of slow strain rate tensile testing for assessing hydrogen embrittlement susceptibility. https://arxiv.org/abs/1910.07983

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