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<p>Hydrogen embrittlement (HE) remains a critical challenge for high-strength steels. This study comparatively investigates the HE behavior and hydrogen diffusion characteristics of a vanadium-micro-alloyed 42CrNiMoV steel against conventional 40CrNiMo steel through slow strain rate testing (SSRT), hydrogen thermal desorption, and hydrogen permeation measurements. The 42CrNiMoV steel demonstrated better mechanical properties and improved HE resistance under SSRT with both hydrogen pre-charged and in situ charging conditions. Microstructural analysis revealed that vanadium micro-alloying leads to grain refinement and reduces hydrogen diffusivity through vanadium carbides. Fractographic investigations revealed the environment-dependent fracture mechanisms, transitioning from ductile- to brittle-dominated failure modes under different hydrogen-charging conditions. These findings validate that vanadium micro-alloying represents a promising, cost-effective strategy for developing hydrogen-resistant high-strength steels, while emphasizing the crucial need for rigorous hydrogen ingress control in practical applications.</p>

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Enhanced Hydrogen Embrittlement Resistance in a Vanadium-Alloyed 42CrNiMoV Steel for High-Strength Wind Turbine Bolts

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • Jiang Liu,
  • Fengping Zhao,
  • Wen Shi,
  • Han Dong,
  • Xiaofei Guo

摘要

Hydrogen embrittlement (HE) remains a critical challenge for high-strength steels. This study comparatively investigates the HE behavior and hydrogen diffusion characteristics of a vanadium-micro-alloyed 42CrNiMoV steel against conventional 40CrNiMo steel through slow strain rate testing (SSRT), hydrogen thermal desorption, and hydrogen permeation measurements. The 42CrNiMoV steel demonstrated better mechanical properties and improved HE resistance under SSRT with both hydrogen pre-charged and in situ charging conditions. Microstructural analysis revealed that vanadium micro-alloying leads to grain refinement and reduces hydrogen diffusivity through vanadium carbides. Fractographic investigations revealed the environment-dependent fracture mechanisms, transitioning from ductile- to brittle-dominated failure modes under different hydrogen-charging conditions. These findings validate that vanadium micro-alloying represents a promising, cost-effective strategy for developing hydrogen-resistant high-strength steels, while emphasizing the crucial need for rigorous hydrogen ingress control in practical applications.