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<p>The mechanical properties, microstructure and second phase precipitation behavior of flange forgings for high-pressure hydrogen storage vessels at different tempering temperatures (620–700&#xa0;°C) were studied. The results showed that when tempered at 620–680&#xa0;°C, the main microstructure of the test steel was tempered sorbite, and the main microstructure of tempered steel changed to martensite at 700&#xa0;°C. At 700&#xa0;°C, the dislocation density increased and some retained austenite existed. With the tempering temperature increasing, the yield strength showed a decreasing trend, the formation of fresh martensite made the tensile strength first decrease and then increase slightly, the impact energy at −40&#xa0;°C increased first and then decreased, and the impact energy at 660&#xa0;°C had the maximum value. The precipitates of MC type were mainly (Mo, V, Ti)C. The test steel had excellent strength and toughness matching at 660&#xa0;°C tempering, the tensile strength at different cross section locations was above 750&#xa0;MPa, the impact energy was above 200&#xa0;J at −40&#xa0;°C, and the relative percentage reduction of area (<i>Z</i><sub>H2</sub>/<i>Z</i><sub>N2</sub>) was above 75% at hydrogen environment of 6.3&#xa0;MPa.</p>

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Effect of tempering temperature on microstructure and mechanical properties of flange forgings for high-pressure hydrogen storage vessels

  • 期刊论文

  • 发表日期：

    2025年3月17日

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  • Xin-jun Sun,
  • Kang-feng Zhu,
  • Hai-dong Jia,
  • Bo Zhang,
  • Ba Li,
  • Wan-bo Dou,
  • Xiao-kai Liang,
  • Cai-fu Yang

摘要

The mechanical properties, microstructure and second phase precipitation behavior of flange forgings for high-pressure hydrogen storage vessels at different tempering temperatures (620–700 °C) were studied. The results showed that when tempered at 620–680 °C, the main microstructure of the test steel was tempered sorbite, and the main microstructure of tempered steel changed to martensite at 700 °C. At 700 °C, the dislocation density increased and some retained austenite existed. With the tempering temperature increasing, the yield strength showed a decreasing trend, the formation of fresh martensite made the tensile strength first decrease and then increase slightly, the impact energy at −40 °C increased first and then decreased, and the impact energy at 660 °C had the maximum value. The precipitates of MC type were mainly (Mo, V, Ti)C. The test steel had excellent strength and toughness matching at 660 °C tempering, the tensile strength at different cross section locations was above 750 MPa, the impact energy was above 200 J at −40 °C, and the relative percentage reduction of area (ZH2/ZN2) was above 75% at hydrogen environment of 6.3 MPa.