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<p>Maraging steels are ultra-high-strength alloys whose microstructure and mechanical properties are predominantly determined by aging temperature. This study systematically compares the aging response (at 450, 500, 550 °C) of Co-containing and Co-free Mo-modified grades. Results reveal that Co significantly enhances precipitation kinetics and refines precipitate distribution, while effectively suppressing the formation of reverted austenite. This alters the strength–toughness balance, with Co-containing alloys achieving higher strength and Co-free alloys exhibiting superior ductility. Mechanical testing identified 500 °C as the optimum aging temperature. Strengthening mechanism analysis confirmed that Co promotes a synergistic combination of matrix and precipitation strengthening. This work elucidates Co’s governing role in precipitation and phase transformation, providing a foundation for designing high-performance maraging steels.</p>

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The role of aging temperature in Co-containing and Co-free maraging steels

  • 期刊论文

  • 发表日期：

    2026年1月17日

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  • Yiran Wang,
  • Ruian Wang,
  • Xuan Zhou

摘要

Maraging steels are ultra-high-strength alloys whose microstructure and mechanical properties are predominantly determined by aging temperature. This study systematically compares the aging response (at 450, 500, 550 °C) of Co-containing and Co-free Mo-modified grades. Results reveal that Co significantly enhances precipitation kinetics and refines precipitate distribution, while effectively suppressing the formation of reverted austenite. This alters the strength–toughness balance, with Co-containing alloys achieving higher strength and Co-free alloys exhibiting superior ductility. Mechanical testing identified 500 °C as the optimum aging temperature. Strengthening mechanism analysis confirmed that Co promotes a synergistic combination of matrix and precipitation strengthening. This work elucidates Co’s governing role in precipitation and phase transformation, providing a foundation for designing high-performance maraging steels.