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<p>The synergistic effects of corrosion and impact loading on the microstructure evolution and dynamic mechanical properties of ultrahigh-strength AerMet 100 steel are investigated. Through integrated experiments and modeling, the result reveals that the corrosion leads to grain refinement and a reduction in the proportion of low-angle grain boundaries. Notably, corrosion promotes austenite enrichment (increasing from 1.8% to 13.9%) through selective dissolution of the martensitic matrix, while repetitive impacts reverse this trend (reducing to 0.1%) through stress-induced martensitic transformation. Fracture analysis demonstrates corrosion-induced ductile-to-brittle transition, with quasi-cleavage features dominating after prolonged corrosion. A physics-based dynamic yield strength model with &lt; 3% prediction error relative to impact tests is developed. These findings establish microstructure-property relationships of AerMet 100 steel under multi-field coupling, providing critical guidance for designing corrosion-resistant ultrahigh-strength steels in marine-impact environments.</p>

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Synergistic corrosion-impact degradation mechanisms in ultrahigh-strength steel: an integrated experiment-modelling study

  • 期刊论文

  • 发表日期：

    2025年12月24日

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  • Shuo Wang,
  • Li-Bo Yu,
  • Han-Yao Xiao,
  • Qi-Hong Fang,
  • Shao-Hua Xing,
  • Yong Zhang,
  • Jia Li

摘要

The synergistic effects of corrosion and impact loading on the microstructure evolution and dynamic mechanical properties of ultrahigh-strength AerMet 100 steel are investigated. Through integrated experiments and modeling, the result reveals that the corrosion leads to grain refinement and a reduction in the proportion of low-angle grain boundaries. Notably, corrosion promotes austenite enrichment (increasing from 1.8% to 13.9%) through selective dissolution of the martensitic matrix, while repetitive impacts reverse this trend (reducing to 0.1%) through stress-induced martensitic transformation. Fracture analysis demonstrates corrosion-induced ductile-to-brittle transition, with quasi-cleavage features dominating after prolonged corrosion. A physics-based dynamic yield strength model with < 3% prediction error relative to impact tests is developed. These findings establish microstructure-property relationships of AerMet 100 steel under multi-field coupling, providing critical guidance for designing corrosion-resistant ultrahigh-strength steels in marine-impact environments.