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<p>The hydrogen-induced damage behavior of high-strength steel in marine flexible risers has always been a research hotspot in the field of marine engineering. This article investigates the effects of three heat-treatment processes, namely quenching and tempering (QT, 950℃ × 30&#xa0;min + 630℃ × 30&#xa0;min), double quenching and tempering (QQT, 950℃ × 30&#xa0;min + 930℃ × 30&#xa0;min + 630℃ × 30&#xa0;min), and quenching and normalizing and tempering (QNT, 950℃ × 30&#xa0;min + 930℃ × 30&#xa0;min + 630℃ × 30&#xa0;min), on hydrogen-induced damage behavior in 800-MPa grade marine flexible riser steel through microstructure characterization, hydrogen permeation, slow strain rate tensile testing, and hydrogen-induced cracking experiments. The results showed that the microstructures obtained by the three processes were tempered sorbite with precipitated phases, while the QNT process obtained finer and more dispersed face centered cubic (Ti,Nb)C precipitated particles. The precipitation phase in QNT process creates numerous irreversible hydrogen traps, providing more channels and positions for the diffusion and aggregation of hydrogen atoms in the material, which can effectively reduce the sensitivity of the material to hydrogen embrittlement. The QNT process can achieve both ensuring the yield strength of steel and improving its resistance to hydrogen-induced damage.</p>

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Effect of Multi-Stage Heat Treatment on the Hydrogen-Induced Damage Behavior of 800 MPa-Grade Steel for Marine Risers

  • 期刊论文

  • 发表日期：

    2025年10月14日

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  • Tingfeng Xu,
  • Shuai Yu,
  • Dazheng Zhang

摘要

The hydrogen-induced damage behavior of high-strength steel in marine flexible risers has always been a research hotspot in the field of marine engineering. This article investigates the effects of three heat-treatment processes, namely quenching and tempering (QT, 950℃ × 30 min + 630℃ × 30 min), double quenching and tempering (QQT, 950℃ × 30 min + 930℃ × 30 min + 630℃ × 30 min), and quenching and normalizing and tempering (QNT, 950℃ × 30 min + 930℃ × 30 min + 630℃ × 30 min), on hydrogen-induced damage behavior in 800-MPa grade marine flexible riser steel through microstructure characterization, hydrogen permeation, slow strain rate tensile testing, and hydrogen-induced cracking experiments. The results showed that the microstructures obtained by the three processes were tempered sorbite with precipitated phases, while the QNT process obtained finer and more dispersed face centered cubic (Ti,Nb)C precipitated particles. The precipitation phase in QNT process creates numerous irreversible hydrogen traps, providing more channels and positions for the diffusion and aggregation of hydrogen atoms in the material, which can effectively reduce the sensitivity of the material to hydrogen embrittlement. The QNT process can achieve both ensuring the yield strength of steel and improving its resistance to hydrogen-induced damage.