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<p>To solve the problem of difficult control of thermal creep in the manufacturing process of manned submersible pressure shell made of titanium alloy, 18NiC350 maraging steel was proposed to prepare the pressure shell of manned submersible to solve the phenomenon of difficult control of structural deformation and failure during manufacturing. Tensile tests of 18NiC350 at 20&#xa0;°C and elevated temperature were conducted. A temperature-dependent strain rate strengthening model was established, and the microstructure of EBSD was observed. The optimum process parameters of 18NiC350 in elevated-temperature tensile behavior were discussed. Based on Arrhenius theory, the constitutive model of 18NiC350 under elevated-temperature deformation was established. The results show that the thermal deformation parameters reveal the plasticity, strength and hardening characteristics of 18NiC350 during elevated-temperature forming, and the coincidence coefficient between the optimized constitutive fitting curve and the calculated value of the experimental data was higher than 0.98.</p>

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Study on Process Optimization of 18NiC350 Maraging Steel and Establishment of Elevated-Temperature Constitutive Model

  • 期刊论文

  • 发表日期：

    2025年7月29日

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  • Zhiying Sun,
  • Weijie Cheng,
  • Mingting Shen,
  • Huiming Cheng

摘要

To solve the problem of difficult control of thermal creep in the manufacturing process of manned submersible pressure shell made of titanium alloy, 18NiC350 maraging steel was proposed to prepare the pressure shell of manned submersible to solve the phenomenon of difficult control of structural deformation and failure during manufacturing. Tensile tests of 18NiC350 at 20 °C and elevated temperature were conducted. A temperature-dependent strain rate strengthening model was established, and the microstructure of EBSD was observed. The optimum process parameters of 18NiC350 in elevated-temperature tensile behavior were discussed. Based on Arrhenius theory, the constitutive model of 18NiC350 under elevated-temperature deformation was established. The results show that the thermal deformation parameters reveal the plasticity, strength and hardening characteristics of 18NiC350 during elevated-temperature forming, and the coincidence coefficient between the optimized constitutive fitting curve and the calculated value of the experimental data was higher than 0.98.