Coupling between phase transition and spallation in hierarchically structured high-strength martensitic steels under shock loading

YF Hong and J Zhang and FC Wu and ZG Zhang and XP Luo and XH Li and ZG Li and Y Wang and S Chen and YY Yu and JB Hu, ENGINEERING FRACTURE MECHANICS, 309, 110431 (2024).

DOI: 10.1016/j.engfracmech.2024.110431

This work presents a comprehensive and in-depth investigation of spall damage behaviors of bainitic and martensitic steels involving phase transitions. Plate-impact experiments, postmortem characterizations, molecular dynamics simulations considering realistic microstructures of bainitic and martensitic steels, and one-dimensional hydrodynamics simulations incorporating phase transition and spall damage are conducted and investigated. Origins of the multiple spall planes and their characteristics within steels are elucidated. Both steels exhibit a quasi-cleavage fracture mode involving phase transitions, with damage morphologies dependent on the microstructures and validated by molecular dynamics simulations. One-dimensional hydrodynamics simulations successfully replicate the dynamic spallation evolutions in steels considering phase transitions.

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