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<p>Maraging steels with exceptional strength and desirable properties are widely used in numerous industrial applications. However, traditional ultrahigh-strength maraging steels generally exhibit early plastic instability with a low uniform strain due to the semi-coherent or non-coherent nanoparticles precipitated in body-centered cubic (BCC) martensitic matrix. In this study, a new maraging steel with exceptional strength (Fe−7.95Cr-13.47Ni-3.10Al-1.83Mo-0.03C-0.23Nb, wt.%) was developed using a cluster formula approach, featuring coherent nanoprecipitates for enhanced mechanical properties. This alloy exhibits unique microstructures featuring a homogeneous distribution of high-density coherent B2-NiAl nanoprecipitates (3 ~ 6&#xa0;nm) in the BCC martensitic matrix. These B2 nanoparticles show a prominent thermal stability due to the relatively lower lattice misfit (~ 0.28), as evidenced by the particle size of 3 ~ 6&#xa0;nm even after aging at 773&#xa0;K for 48&#xa0;h. This alloy not only possesses a good balance between strength and ductility with an exceptionally high ultimate tensile strength of 2009&#xa0;MPa and excellent uniform elongation of 3.7 ~ 5.6%, but also exhibits good bending ability with ultimate bending angles (~ 27°). Quantitative analysis of strengthening mechanisms reveals that precipitation strengthening from the coherent B2 nanoparticles (Δ<i>σ</i><sub><i>Bs2</i></sub> = 1016&#xa0;MPa) is dominant. Moreover, the good strain hardening ability is attributed to the coherent B2 nanoparticles sheared by dislocations. These findings offer a valuable reference for developing the novel ultrahigh-strength maraging stainless steel.</p>

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Synergetic Enhancement of Strength and Ductility in a Novel Ultra-strong Fe-Based Superalloy via BCC/B2 Coherent Precipitation

  • 期刊论文

  • 发表日期：

    2025年11月3日

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  • Yuxian Yang,
  • Caiyu Tang,
  • Zhenhua Wang,
  • Ben Niu,
  • Qing Wang,
  • Peng Wan,
  • Dahua Cao,
  • Chuang Dong

摘要

Maraging steels with exceptional strength and desirable properties are widely used in numerous industrial applications. However, traditional ultrahigh-strength maraging steels generally exhibit early plastic instability with a low uniform strain due to the semi-coherent or non-coherent nanoparticles precipitated in body-centered cubic (BCC) martensitic matrix. In this study, a new maraging steel with exceptional strength (Fe−7.95Cr-13.47Ni-3.10Al-1.83Mo-0.03C-0.23Nb, wt.%) was developed using a cluster formula approach, featuring coherent nanoprecipitates for enhanced mechanical properties. This alloy exhibits unique microstructures featuring a homogeneous distribution of high-density coherent B2-NiAl nanoprecipitates (3 ~ 6 nm) in the BCC martensitic matrix. These B2 nanoparticles show a prominent thermal stability due to the relatively lower lattice misfit (~ 0.28), as evidenced by the particle size of 3 ~ 6 nm even after aging at 773 K for 48 h. This alloy not only possesses a good balance between strength and ductility with an exceptionally high ultimate tensile strength of 2009 MPa and excellent uniform elongation of 3.7 ~ 5.6%, but also exhibits good bending ability with ultimate bending angles (~ 27°). Quantitative analysis of strengthening mechanisms reveals that precipitation strengthening from the coherent B2 nanoparticles (ΔσBs2 = 1016 MPa) is dominant. Moreover, the good strain hardening ability is attributed to the coherent B2 nanoparticles sheared by dislocations. These findings offer a valuable reference for developing the novel ultrahigh-strength maraging stainless steel.