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<p>Conventional processing routes rely on substantial addition of costly alloying elements such as Co and involve multiple complex steps, resulting in high production cost and low efficiency. In this study, cobalt-free maraging steel strips were fabricated through twin-roll strip casting (TRSC), followed by hot rolling and aging treatments. The sub-rapid cooling effect during the TRSC process produced a fully martensitic microstructure characterized by the micrometer-scale element segregation of Ni and Mo, without the presence of retained austenite or precipitates. Subsequent hot rolling fragmented the Ni-enriched interdendritic regions into uniformly dispersed microdomains and introduced a high density of dislocations and grain boundaries. During aging, the nucleation of reverted austenite was synergistically promoted by compositional fluctuations arising from Ni segregation and by structural defects including dislocations and grain boundaries. Consequently, the combined effects of compositional design and microstructure regulation markedly accelerated the transformation kinetics. This led to the formation of fine and homogeneously distributed reverted austenite, which contributed to improved ductility while maintaining high strength. Meanwhile, uniformly dispersed nanoscale precipitates within the martensitic matrix acted as the primary strengthening phase. As a result, the HR35-AT specimen achieved a tensile strength of 1336&#xa0;MPa accompanied by a total elongation of 25.7 pct. The results demonstrate that the TRSC route provides an efficient and cost-effective pathway for producing high-performance cobalt-free maraging steel strips. By eliminating long-period homogenization treatment and extensive hot rolling procedures, the TRSC process enables the direct fabrication of maraging steels with an excellent strength-ductility synergy.</p>

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Short-Process Strip Casting to Produce Low-Cost Cobalt-Free Maraging Steel with Excellent Mechanical Properties

  • 期刊论文

  • 发表日期：

    2026年7月14日

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  • Weiming Pan,
  • Song Mao,
  • Wanlin Wang,
  • Chengbin Shi,
  • Peisheng Lyu

摘要

Conventional processing routes rely on substantial addition of costly alloying elements such as Co and involve multiple complex steps, resulting in high production cost and low efficiency. In this study, cobalt-free maraging steel strips were fabricated through twin-roll strip casting (TRSC), followed by hot rolling and aging treatments. The sub-rapid cooling effect during the TRSC process produced a fully martensitic microstructure characterized by the micrometer-scale element segregation of Ni and Mo, without the presence of retained austenite or precipitates. Subsequent hot rolling fragmented the Ni-enriched interdendritic regions into uniformly dispersed microdomains and introduced a high density of dislocations and grain boundaries. During aging, the nucleation of reverted austenite was synergistically promoted by compositional fluctuations arising from Ni segregation and by structural defects including dislocations and grain boundaries. Consequently, the combined effects of compositional design and microstructure regulation markedly accelerated the transformation kinetics. This led to the formation of fine and homogeneously distributed reverted austenite, which contributed to improved ductility while maintaining high strength. Meanwhile, uniformly dispersed nanoscale precipitates within the martensitic matrix acted as the primary strengthening phase. As a result, the HR35-AT specimen achieved a tensile strength of 1336 MPa accompanied by a total elongation of 25.7 pct. The results demonstrate that the TRSC route provides an efficient and cost-effective pathway for producing high-performance cobalt-free maraging steel strips. By eliminating long-period homogenization treatment and extensive hot rolling procedures, the TRSC process enables the direct fabrication of maraging steels with an excellent strength-ductility synergy.