Refinement effect of NbC particle additions on the microstructure of high-speed steel rolls

Li, Haonan; Zhang, Bo-han; Qiao, Guifang; Yuan, Naibo; Xiao, Furen

doi:10.1016/j.jmrt.2023.07.283

Cited by 6 publications

(2 citation statements)

References 48 publications

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“…According to the 2D lattice mismatch theory proposed by Bramfitt, [19] the lower the lattice mismatch, the easier the nucleation phase is to precipitate on the nucleation substrate. The interface between NbC(111) and γ-Fe(110) exhibits the smallest misfit of 6.38%, [20] indicating that NbC can serve as a moderately effective heterogeneous nucleus for γ-Fe. The austenite can nucleate to the NbC particles.…”

Section: Refining Mechanism Of Niobium On Primary Austenitesmentioning

confidence: 99%

Refinement of Microstructure and Enhancement of Wear Resistance of Ni–Cr Cast Iron by NbC

Cao,

Wang,

Wang

et al. 2024

steel research int.

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This article investigates the influence of niobium addition on the microstructure and properties of Ni–Cr cast iron. In situ observations and analysis of phase precipitation during solidification are conducted through a high‐temperature laser scanning confocal microscope and Thermo‐Calc software. The refining mechanism of the microstructure and the enhancement of wear resistance by NbC are explored. The results indicate that with an increase in Nb content, the precipitation temperature of NbC particles gradually rises. When the niobium content exceeds 0.2%, NbC becomes the first precipitated phase during the solidification of the liquid phase. NbC particles can serve as heterogeneous nucleus for austenite, refining the grain structure of Ni–Cr cast iron. The existence of NbC particles within the grain impedes the elongation of martensite and bainite bundles while providing additional nucleation sites to accelerate the phase transformation. The grain refinement and the obstructive influence of NbC particles collectively induce a more disordered bainitic structure. Moreover, the exceptional hardness of NbC particles effectively safeguards the matrix from abrasion, consequently enhancing the wear resistance of Ni–Cr cast iron.

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Section: Refining Mechanism Of Niobium On Primary Austenitesmentioning

confidence: 99%

Refinement of Microstructure and Enhancement of Wear Resistance of Ni–Cr Cast Iron by NbC

Cao,

Wang,

Wang

et al. 2024

steel research int.

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show abstract

“…Therefore, the chemical compositions of commonly existing VC and NbC in steel are VC 0.875 (VgC,) and NbC 0.875 (NbC,). Metal elements in MC phases can be completely mutually soluble, forming compounds like (V,Ti)C [8,9]. Simple hexagonal lattice MC and M 2 C phases include MoC, WC, Mo 2 C, and W 2 C, while complex hexagonal lattice M 7 C 3 phases include Cr 7 C 3 and Mn 7 C 3 .…”

Section: Introductionmentioning

confidence: 99%

Elastic Properties of Alloyed Cementite M3X (M = Fe, Cr; X = C, B) Phases from First-Principle Calculations and CALPHAD Model

Huang,

Lin,

Wang

et al. 2024

Molecules

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Fe-Cr-C-B wear-resistant steels are widely used as wear-resistant alloys in harsh environments. The M3X (M = Fe, Cr; X = C, B) cementite-type material is a commonly used strengthening phase in these alloys. This study investigated the mechanical properties of cementite (Fe, Cr)3(C, B) using the first-principle density functional theory. We constructed crystal structures of (Fe, Cr)3(C, B) with different concentrations of Cr and B. The bulk modulus, shear modulus, Young’s modulus, Poisson’s ratio, and hardness of the material were calculated, and a comprehensive mechanical property database based on CALPHAD modeling of the full composition was established. The optimal concentrations of the (Fe, Cr)3(C, B) phase were systematically evaluated across its entire composition range. The material exhibited the highest hardness, shear modulus, and Young’s modulus at Cr and B concentrations in the range of 70–95 at% and 40 at%, respectively, rendering it difficult to compress and relatively poor in machinability. When the B content exceeded 90 at%, and the Cr content was zero, the shear modulus and hardness were low, resulting in poor resistance to deformation, reduced stiffness, and ease of plastic processing. This study provides an effective alloying strategy for balancing the brittleness and toughness of (Fe, Cr)3(C, B) phases.

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NbC particles-reinforced 316L stainless steel fabricated by selective laser melting: microstructure, mechanical properties, and strengthening mechanisms

Lin,

Liu,

Yang

2024

Appl. Phys. A

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Refinement effect of NbC particle additions on the microstructure of high-speed steel rolls

Cited by 6 publications

References 48 publications

Refinement of Microstructure and Enhancement of Wear Resistance of Ni–Cr Cast Iron by NbC

Refinement of Microstructure and Enhancement of Wear Resistance of Ni–Cr Cast Iron by NbC

Elastic Properties of Alloyed Cementite M3X (M = Fe, Cr; X = C, B) Phases from First-Principle Calculations and CALPHAD Model

NbC particles-reinforced 316L stainless steel fabricated by selective laser melting: microstructure, mechanical properties, and strengthening mechanisms

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