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<p>Duplex stainless-steel (DSS) powders used for hot isostatic pressing (HIP) often contain moisture, hydrogen, and carbon–oxygen species that promote pore formation and reduce mechanical performance. A staged high-vacuum degassing method with stepwise heating to 600&#xa0;°C and 60-min holds was applied to quantify gas evolution using residual gas analysis (RGA). Distinct desorption peaks were observed for H<sub>2</sub>O, H<sub>2</sub>, CO, and CO<sub>2</sub>, with cumulative releases of 120, 45, 28, and 15&#xa0;nmol/g, respectively, at pressures below 5 × 10<sup>−7</sup> Torr. Activation energies determined using the Polanyi–Wigner approach ranged from 60 to 120&#xa0;kJ/mol. Degassed powder achieved 99.9 pct HIP density and showed 8–10 pct higher tensile strength and 15 pct greater elongation. The results confirm the effectiveness of controlled high-vacuum pretreatment for improving DSS powder cleanliness.</p>

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High-Vacuum Degassing of Duplex Stainless-Steel Powder: Gas Desorption Behavior and HIP Performance

  • 期刊论文

  • 发表日期：

    2026年2月28日

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  • Y. A. Getmanovskiy,
  • A. A. Khlybov,
  • E. S. Belyaev,
  • S. S. Belyaeva,
  • A. A. Cherkasova

摘要

Duplex stainless-steel (DSS) powders used for hot isostatic pressing (HIP) often contain moisture, hydrogen, and carbon–oxygen species that promote pore formation and reduce mechanical performance. A staged high-vacuum degassing method with stepwise heating to 600 °C and 60-min holds was applied to quantify gas evolution using residual gas analysis (RGA). Distinct desorption peaks were observed for H2O, H2, CO, and CO2, with cumulative releases of 120, 45, 28, and 15 nmol/g, respectively, at pressures below 5 × 10−7 Torr. Activation energies determined using the Polanyi–Wigner approach ranged from 60 to 120 kJ/mol. Degassed powder achieved 99.9 pct HIP density and showed 8–10 pct higher tensile strength and 15 pct greater elongation. The results confirm the effectiveness of controlled high-vacuum pretreatment for improving DSS powder cleanliness.