Atomic-Scale Study on the Interaction Mechanism between Cracking and Typical Grain Boundaries in 15-5 PH Stainless Steel

B Li and CH Jin and GQ Li and JH Zhao and JS Chen and LF Ma and RDK Misra, STEEL RESEARCH INTERNATIONAL, 94 (2023).

DOI: 10.1002/srin.202200509

In order to illuminate the hindering effects induced by grain boundaries on the propagation behavior of crack with respect to 15-5 PH stainless steel, interactions between propagated crack and typical grain boundaries, including the parent austenite grain boundary (PAGB), coincidence site lattice sigma 3 grain boundary (CSL sigma 3), packet grain boundary (PGB), and block grain boundary (BGB) are investigated at the atomic scale. Results indicate that the higher stress in the crack initiation (CI) stage and crack and grain boundary interaction (CGB) stage is required to drive the propagating crack in terms of the PAGB model compared to the other models, and the longest interaction time between propagated crack and established grain boundary is needed for the crack from the crack propagation (CP) stage to the CGB stage in the case of the PGB model. The PAGB and PGB are determined to be the most effective in hindering crack propagation in 15-5 PH stainless steel.

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