Enhanced Refinement of Cr23C6 by Heterogeneous Nucleation in Annealed Nitrogen-Alloyed 4Cr5Mo2V Die Steel

Gu, Jianan; Li, Jingyuan; Chang, Ruijin

doi:10.1007/s11661-018-5020-6

Cited by 12 publications

(5 citation statements)

References 18 publications

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“…It has been reported that VC and VN can mutually dissolve to form V(C, N) because of their same crystal structure and similar lattice parameter. 33) On the other hand, this mixture type precipitate can also just form simultaneously due to the same type structure and also the similar atom size of C and N. Therefore, V-rich MC carbides generally exist in composite carbonitrides M(C, N) in M42N cast ingot.…”

Section: Effect Of Nitrogen On the As-cast Microstructurementioning

confidence: 99%

Effect of High Nitrogen Addition on Microstructure and Mechanical Properties of As-cast M42 High Speed Steel

Jiao

Feng

et al. 2020

ISIJ Int.

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This study systematically investigated the influence of high nitrogen (N) addition (0.205 wt.%) on microstructure and mechanical properties of as-cast M42 high speed steel. The results demonstrate that the conventional and high-nitrogen M42 cast ingots are mainly composed of martensite, retained austenite and various precipitates (M 2 C, M 6 C as well as MC in M42 cast ingot or M(C, N) in M42N cast ingot). The addition of N could increase the retained austenite content, trigger the transformation of MC to M(C, N), favor the formation of M 2 C at the expense of M 6 C, and improve the distribution uniformity of M 6 C at the macroscopic scale. Moreover, the addition of N could lead to the reduction of the secondary dendrite arm spacing as well as the decrease of the thickness and area fraction of eutectic carbides, and improve the distribution uniformity of eutectic carbides at the microscopic scale. The M(C, N) particles form directly from the liquid phase prior to the formation of primary austenite, which could act as the heterogeneous nuclei of primary austenite and thus promote the refinement of the as-cast microstructure. The addition of N slightly decreases the macro-hardness and ultimate compression strength of the cast ingot but increases its ductility, which could be ascribed to the increase of retained austenite content and the reduction in the amount of eutectic carbides. Therefore, high N addition can significantly improve the as-cast microstructure of M42 high speed steel, which is promising for the further enhancement of the mechanical property and service life of the final product.KEY WORDS: M42 high speed steel; pressurized metallurgy; nitrogen; as-cast microstructure; precipitates; mechanical property. N i J J J J J D

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Section: Effect Of Nitrogen On the As-cast Microstructurementioning

confidence: 99%

Effect of High Nitrogen Addition on Microstructure and Mechanical Properties of As-cast M42 High Speed Steel

Jiao

Feng

et al. 2020

ISIJ Int.

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“…The growth rate of eutectic austenite as a non-faceted phase is greater than that of M 2 C carbides (faceted phase). Because M 2 C is the dictating phase of the eutectic reaction, it bends and branches continually to prevent eutectic austenite from overgrowing [86]. As a result, when the rare earth content in high-speed steel increases, the morphology of M 2 C changes from long flake or straight rod shapes to short curved rod or honeycomb shapes (Figure 11).…”

Section: Rare Earthmentioning

confidence: 99%

“…Metals 2024, 14, x FOR PEER REVIEW 13 of 21 continually to prevent eutectic austenite from overgrowing [86]. As a result, when the rare earth content in high-speed steel increases, the morphology of M2C changes from long flake or straight rod shapes to short curved rod or honeycomb shapes (Figure 11).…”

Section: Rare Earthmentioning

confidence: 99%

Effect of Alloying and Microalloying Elements on Carbides of High-Speed Steel: An Overview

Chen,

Ye,

Chen

et al. 2024

Metals

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In high-speed steel, carbides are essential phase constituents, which have a direct impact on engineering performance and qualities of high-speed steel. The formation, morphology, and distribution of carbides are dictated by alloying elements. In this paper, various types of carbides in high-speed steel are presented. The effects of different alloying elements such as C, W, Mo, Cr, and V on the formation of carbides in high-speed steel are discussed. Research progresses on carbide improvement by microalloying elements such as N, B, Mg, and rare earth (RE) elements are reviewed. It is reported that Cr promotes the precipitation of M2C, N enhances the formation of fibrous M2C, Mg effectively shatters the large-size carbide grid, Nb refines granular carbide MC, and rare earth elements encourage the formation of M6C, resulting in irregular M2C lamellae. The incorporation of microalloying elements improves the distribution and size of carbides and also refines the solidification structure of high-speed steel.

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“…The ratio of their parameters and the austenite lattice parameters is 3:1 [27]. In austenitic stainless steels they nucleate predominantly at general austenite grain boundaries (AGBs) [28][29][30], at incoherent twin boundaries [29,31,32], but also intra-granularly on dislocations [28,33,34] or on the MX (M = Ti, V, Nb; X = C, N) precipitations [29,35,36]. They can also nucleate homogeneously at high temperatures [37].…”

Section: Phase Transformations During Iatmentioning

confidence: 99%

Influence of Intermediate Annealing Treatment on the Kinetics of Bainitic Transformation in X37CrMoV5-1 Steel

et al. 2021

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Intermediate annealing treatment (IAT) is a new process that accelerates the bainitic transformation in steels. This stimulation is crucial, especially in the prolonged production of nanobainitic steels. Among other recognised methods, it seems to be an effective and economical process. However, there are very few research works in this area. The objective of this study was to collate microstructural changes caused by IAT with differences in the kinetics of the subsequent bainitic transformation in the X37CrMoV5-1 tool steel. Differential dilatometry, LM and SEM microscopic observations, EDS and XRD analysis, and computer simulations were used to investigate the effect of IAT on the kinetics of bainitic transformation. The study has revealed that introducing an additional isothermal heating stage immediately after austenitising significantly affects the kinetics of bainitic transformation—it can accelerate or suppress it. The type and strength of the effect depends on the concentration, distribution, and morphology of the precipitations that occurred during IAT.

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Enhanced Refinement of Cr23C6 by Heterogeneous Nucleation in Annealed Nitrogen-Alloyed 4Cr5Mo2V Die Steel

Cited by 12 publications

References 18 publications

Effect of High Nitrogen Addition on Microstructure and Mechanical Properties of As-cast M42 High Speed Steel

Effect of High Nitrogen Addition on Microstructure and Mechanical Properties of As-cast M42 High Speed Steel

Effect of Alloying and Microalloying Elements on Carbides of High-Speed Steel: An Overview

Influence of Intermediate Annealing Treatment on the Kinetics of Bainitic Transformation in X37CrMoV5-1 Steel

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