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<p>The Cr-Co-Ni-Mo ultra-high strength stainless steel (UHSSS) was developed for the next generation of aircraft landing gear due to its excellent mechanical properties and corrosion resistance. The hot workability of this UHSSS was studied through single-pass hot compression tests with a strain rate range of 10<sup>−3</sup>-10&#xa0;s<sup>−1</sup> and a temperature range of 950-1150&#xa0;°C. A strain-compensated Arrhenius-type constitutive equation was established to relate temperature, strain rate, and strain to flow stress. Based on dynamic material model and the instability criterion, a 3D strain-layered hot processing map and an improved ln<i>Z</i> (Zener-Hollomon parameter) vs. strain hot processing map were developed for strains of 0.2-0.8, determining the range of ln<i>Z</i> is from 25 to 31, depending on different strains as the optimized processing parameters. The optical microstructure observed in the characteristic regions of the hot deformation map indicates that dynamic recrystallization (DRX) serves as the dominant deformation mechanism. Instability exhibits strain independence, peaking in the high ln<i>Z</i> region. Characterize the hot workability using the improved hot processing map which can consider the synergistic effect of strain rate, temperature, and strain.</p>

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Characterization of Hot Workability of a Cr-Co-Ni-Mo Ultra-high Strength Stainless Steel: An Improved Hot Processing Map

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Hao-chen Ding,
  • Ya-long Luo,
  • Chi Zhang,
  • Ying-hu Wang,
  • Zhen-dong Sheng,
  • Huai-bei Zheng,
  • Li-wen Zhang

摘要

The Cr-Co-Ni-Mo ultra-high strength stainless steel (UHSSS) was developed for the next generation of aircraft landing gear due to its excellent mechanical properties and corrosion resistance. The hot workability of this UHSSS was studied through single-pass hot compression tests with a strain rate range of 10−3-10 s−1 and a temperature range of 950-1150 °C. A strain-compensated Arrhenius-type constitutive equation was established to relate temperature, strain rate, and strain to flow stress. Based on dynamic material model and the instability criterion, a 3D strain-layered hot processing map and an improved lnZ (Zener-Hollomon parameter) vs. strain hot processing map were developed for strains of 0.2-0.8, determining the range of lnZ is from 25 to 31, depending on different strains as the optimized processing parameters. The optical microstructure observed in the characteristic regions of the hot deformation map indicates that dynamic recrystallization (DRX) serves as the dominant deformation mechanism. Instability exhibits strain independence, peaking in the high lnZ region. Characterize the hot workability using the improved hot processing map which can consider the synergistic effect of strain rate, temperature, and strain.