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<p>Liquid jet quenching is widely used in steel heat treatment process in order to obtain specific enhanced material properties by controlling the heat transfer performance. The hardness and properties of metal material are influenced by spatial and temporal heat transfer behavior. In this work, the heat transfer characteristics between molten salt nanofluids and high temperature metal steel, the temperature field inside steel, and the phase structure field in the cooling process of molten salt nanofluids jet impingement steel are numerically studied. The different jet conditions such as temperature, speed, and angle are studied based on multi physics field coupling method. The maximum phase formation rate of pearlite decreases with increasing temperature. When the jet temperature of molten salt nanofluids is 450&#xa0;℃, the final phase content of bainite is 4.72%. Compared with jet temperature 450&#xa0;℃, the final bainite phase content at 400&#xa0;℃ and 350&#xa0;℃ increased by 30.5% and 73.9%, respectively. The angle of molten salt nanofluids jet has a significant impact on the cooling rate of steel during the heat treatment process. When the jet angle is 30°, the average pearlite formation rate curve of the steel plate is similar to the superposition of two different “bell”-shaped curves, resulting in a double peak value. This work could provide theoretical support for jet impingement heat treatment of molten salt nanofluids to metal steel.</p>

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Investigation on metal quenching by molten salt nanofluids jet impingement based on multi-physics field coupling method

  • 期刊论文

  • 发表日期：

    2025年4月10日

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  • Songtao Han,
  • Jialong Liu,
  • Cancan Zhang,
  • Yuting Wu

摘要

Liquid jet quenching is widely used in steel heat treatment process in order to obtain specific enhanced material properties by controlling the heat transfer performance. The hardness and properties of metal material are influenced by spatial and temporal heat transfer behavior. In this work, the heat transfer characteristics between molten salt nanofluids and high temperature metal steel, the temperature field inside steel, and the phase structure field in the cooling process of molten salt nanofluids jet impingement steel are numerically studied. The different jet conditions such as temperature, speed, and angle are studied based on multi physics field coupling method. The maximum phase formation rate of pearlite decreases with increasing temperature. When the jet temperature of molten salt nanofluids is 450 ℃, the final phase content of bainite is 4.72%. Compared with jet temperature 450 ℃, the final bainite phase content at 400 ℃ and 350 ℃ increased by 30.5% and 73.9%, respectively. The angle of molten salt nanofluids jet has a significant impact on the cooling rate of steel during the heat treatment process. When the jet angle is 30°, the average pearlite formation rate curve of the steel plate is similar to the superposition of two different “bell”-shaped curves, resulting in a double peak value. This work could provide theoretical support for jet impingement heat treatment of molten salt nanofluids to metal steel.