Superhardenability behavior of vanadium in 40CrNiMoV steel

Chen, C.; Zhang, F.C.; Yang, Zhinan; Chen, Zheng

doi:10.1016/j.matdes.2015.06.050

Cited by 19 publications

(2 citation statements)

References 21 publications

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“…The conversion points of the martensitic transformation were analyzed from the dilatometry curve using the tangent method [20].…”

Section: Methodsmentioning

confidence: 99%

Microstructure and Strengthening-Toughening Mechanism of Nitrogen-Alloyed 4Cr5Mo2V Hot-Working Die Steel

Chen

2017

Metals

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Abstract:The microstructure and strengthening-toughening mechanism of a modified 4Cr5Mo2V hot-working die steel with nitrogen (0.08% N) were investigated using hardness and toughness measurements, optical microscopy, scanning electron microscopy, X-ray diffraction experiments, transmission electron microscopy, and dilatometry. The results showed that the nitrogen addition could increase the hardness and temperability of 4Cr5Mo2V steel without toughness loss with a suitable heat treatment procedure. The fair match of high strength and toughness of the nitrogen-alloyed 4Cr5Mo2V steel is associated with the refinement of the prior austenite grain, the solution hardening of nitrogen atoms, and the increase of retained austenite. Before quenching, nitrogen tends to precipitate in the form of a large amount of undissolved finer V(C, N), imposing a stronger effect on restricting the growth of prior austenitic grains and increasing the grain refining efficiency of VC by 6.8 times according to an estimate. During the quenching process, the nitrogen decreases the M S of the martensitic transformation, increasing retained austenite, which is a benefit for toughness. During the tempering process, some of the N atoms in M(C, N) were dissolved in the matrix, causing crystal lattice distortions, thus boosting the solution reinforcing effect. Meanwhile, the solid-dissolved nitrogen inhibits the diffusion of carbon, decreasing the growth rate of the carbides and increasing tempering resistance.

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“…The conversion points of the martensitic transformation were analyzed from the dilatometry curve using the tangent method [20].…”

Section: Methodsmentioning

confidence: 99%

Microstructure and Strengthening-Toughening Mechanism of Nitrogen-Alloyed 4Cr5Mo2V Hot-Working Die Steel

Chen

2017

Metals

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“…But as the cooling rate is not adequately high for martensitic transformation in the core of heavy plate steel, ferrite and bainitic microstructure would be formed at a certain distance from the plate surface. Traditionally, the hardenability of steel can be measured by Jominy end quench test and hardness distribution curve obtained [6]. The hardness is determined by martensite and bainite (ferrite) fraction based on the distance from the quench end, which indicates that the hardness is an indicative of microstructure during different cooling rate.…”

Section: Introductionmentioning

confidence: 99%

Relationship between high angle grain boundaries and hardness after γ→α transformation

Wang

et al. 2019

Materials Science and Technology

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This study is devoted to establish the relationship between high angle grain boundaries (HAGBs) and hardness from crystallography and provide reference for improving the hardenability of high strength ultra-heavy plate steel. The starting temperature during γ→α phase transformation was significantly decreased with the addition of boron (B). Electron backscattered diffraction and grain boundary density statistical results showed that the hardness follows a near linear relationship with the density of HAGBs. The variants of closed-packed (CP) grouping produces higher density of HAGBs and corresponding hardness than Bain grouping, such that a qualitative description that combines Jominy curves with transformation mode is proposed to evaluate hardenability.

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The Influence of Vanadium on Ferrite and Bainite Formation in a Medium Carbon Steel

Sourmail¹,

García‐Mateo

Caballero

et al. 2017

Metall Mater Trans A

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Superhardenability behavior of vanadium in 40CrNiMoV steel

Cited by 19 publications

References 21 publications

Microstructure and Strengthening-Toughening Mechanism of Nitrogen-Alloyed 4Cr5Mo2V Hot-Working Die Steel

Microstructure and Strengthening-Toughening Mechanism of Nitrogen-Alloyed 4Cr5Mo2V Hot-Working Die Steel

Relationship between high angle grain boundaries and hardness after γ→α transformation

The Influence of Vanadium on Ferrite and Bainite Formation in a Medium Carbon Steel

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