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<p>To address the hydrogen-induced cracking failures of age-hardened nickel-based corrosion-resistant alloys, this study systematically investigated the effects of cold deformation before aging on the hydrogen embrittlement susceptibility. Nickel–based alloy 718 (UNS N07718), a representative oilfield corrosion-resistant alloy, was subjected to cold deformation via room-temperature rolling with <i>ε</i> = 0–30% strain before aging. Microstructural characterization was performed on aged alloys with different levels of cold deformation, and hydrogen embrittlement behavior was evaluated through thermal desorption spectroscopy, hydrogen-induced discoloration experiments, and slow strain rate tensile (SSRT) tests. Results showed that the residual microstructures introduced by cold deformation were preserved after aging, which increase dislocation density and the fraction of low-angle grain boundaries, which regulated the distribution of shallow hydrogen traps and mitigated local hydrogen accumulation. Furthermore, increased grain boundary density not only influenced hydrogen diffusion paths but also enhanced the tortuosity of crack propagation, while the formation of triple junctions further reduced crack growth rates. Optimal 20% pre-strain deformation reduces hydrogen embrittlement susceptibility by 37.3%, as evidenced by the reduction in elongation loss in SSRT from 16.9 to 10.6%. The moderate cold deformation-induced before aging increase in hydrogen trapping sites and grain boundary density synergistically limits hydrogen diffusion and promotes crack path tortuosity, thereby effectively mitigating hydrogen embrittlement susceptibility.</p>

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Effect of cold deformation before aging on the hydrogen embrittlement behavior of age-hardened nickel-based corrosion-resistant alloy 718

  • 期刊论文

  • 发表日期：

    2026年3月5日

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  • Yong Lian,
  • Rongrong Chen,
  • Piao Qian,
  • Yingjie Sun,
  • Jin Zhang,
  • Qubo He,
  • Dadi Zhou

摘要

To address the hydrogen-induced cracking failures of age-hardened nickel-based corrosion-resistant alloys, this study systematically investigated the effects of cold deformation before aging on the hydrogen embrittlement susceptibility. Nickel–based alloy 718 (UNS N07718), a representative oilfield corrosion-resistant alloy, was subjected to cold deformation via room-temperature rolling with ε = 0–30% strain before aging. Microstructural characterization was performed on aged alloys with different levels of cold deformation, and hydrogen embrittlement behavior was evaluated through thermal desorption spectroscopy, hydrogen-induced discoloration experiments, and slow strain rate tensile (SSRT) tests. Results showed that the residual microstructures introduced by cold deformation were preserved after aging, which increase dislocation density and the fraction of low-angle grain boundaries, which regulated the distribution of shallow hydrogen traps and mitigated local hydrogen accumulation. Furthermore, increased grain boundary density not only influenced hydrogen diffusion paths but also enhanced the tortuosity of crack propagation, while the formation of triple junctions further reduced crack growth rates. Optimal 20% pre-strain deformation reduces hydrogen embrittlement susceptibility by 37.3%, as evidenced by the reduction in elongation loss in SSRT from 16.9 to 10.6%. The moderate cold deformation-induced before aging increase in hydrogen trapping sites and grain boundary density synergistically limits hydrogen diffusion and promotes crack path tortuosity, thereby effectively mitigating hydrogen embrittlement susceptibility.