Microstructure and Hardness of Cold Work Vanadis 6 Steel after Subzero Treatment at −140°C

Ďurica, Juraj; Ptačinová, Jana; Hudáková, Mária; Kusý, Martin; Jurči, Peter

doi:10.1155/2018/6537509

Cited by 8 publications

(3 citation statements)

References 28 publications

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“…Destabilisation of the austenite increases the Ms temperature, thus decreasing the percentage of retained austenite [ 12 , 13 ]. During tempering, a secondary hardening could be produced due to the precipitation of carbides of the types M 7 C 3 and M 23 C 6 , associated with Cr [ 9 , 14 , 15 ]. At low tempering temperatures, cementite carbides precipitate.…”

Section: Introductionmentioning

confidence: 99%

Optimisation of Thermal Processes with Plasma Nitriding on Vanadis 4 High Speed Steel

et al. 2022

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Vanadis 4 steel is a tool steel processed by powder metallurgy (PM). Its main alloying elements are Cr, V and Mo. Through the application of a design of experiments with six factors and eight experiments, the parameters of the process related to the thermal treatment of these steels are deliberately varied. Those thermal parameters related to the destabilisation of austenite were analysed: the cooling method in quenching, tempering and the application of an ionic nitriding treatment. Through XRD, the percentage and types of precipitated crystalline phases were determined, and, through SEM-EDX, the microstructure was revealed. At the same time, through a pin-on-disc test, those factors with a significant influence on resistance to wear were determined. It has been concluded that, in order to increase resistance to wear, treatments of destabilisation of the austenite at 900 °C with oil quenching, tempering at 550 °C for 4 h and a subsequent treatment of plasma nitriding would be very favourable. This tempering favours a second destabilisation of the austenite and its transformation into martensite, as well as the joint precipitation of type M7C3 and MC carbides. The thickness of the nitrided layer exceeds 100 microns and generates a fully adhesive wear mechanism.

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Section: Introductionmentioning

confidence: 99%

Optimisation of Thermal Processes with Plasma Nitriding on Vanadis 4 High Speed Steel

et al. 2022

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“…In steels of this type, tempering has a very significant influence on the amount of retained austenite [12]. During tempering, secondary hardening may occur due to the precipitation of M 7 C 3 [13] and MC carbides [14][15][16]. This would occur if, after the destabilization of austenite, carbide-forming elements remained dissolved in it.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Quenching and Tempering Parameters for the Precipitation of M7C3 and MC Secondary Carbides and the Removal of the Austenite Retained in Vanadis 10 Tool Steel

González-Pociño

Álvarez-Antolín

Lozano

2019

Metals

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Vanadis 10 steel is a powder metallurgy processed tool steel. The aim of the present study is to analyze the microstructural variation in this steel that takes place when the process variables related to the heat treatments of quenching and tempering are modified. Specifically, the destabilization of austenite, the precipitation of secondary carbides and the amount of retained austenite were analyzed. The research methodology employed was a Design of Experiments (DoE). The percentage and types of precipitated crystalline phases were determined by XRD, while the microstructure was revealed by means of SEM-energy-dispersive X-ray spectroscopy (EDX). The destabilization of austenite was favored by tempering at 600 °C for at least 4 h. These same conditions stimulated the removal of the retained austenite and the precipitation of M7C3 secondary carbides. For the precipitation of MC secondary carbides, it was necessary to maintain the steel at a temperature of 1100 °C for at least 8 h. The highest hardness values were obtained when the tempering temperature was lower (500 °C). Tempering in air or oil did not have a significant influence on the hardness of the steel after double or triple tempering at 500 or 600 °C. These results allow the manufacturers of industrial tools and components that use this type of steel in the annealed state as a material to define the most suitable quenching and tempering heat treatment to optimize the in-service behavior of these steels.

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“…The application of SZT produces a considerably higher amount and population density of cementite particles (of size 100-500 nm, small globular carbides (SGCs)), whereas the SZT at −140 • C acts more effectively in this way [11,14,15,18,40]. Tempering always reduces the amount of these carbides.…”

mentioning

confidence: 99%

Effect of Sub-Zero Treatment Temperatures on Hardness, Flexural Strength, and Fracture Toughness of Vanadis 6 Ledeburitic Die Steel

Jurči¹,

Dlouhý

Priknerová³

et al. 2018

Metals

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Any improvement on the service life of tools reduces the tooling costs, and assists to increase labor productivity by decreasing the needs for either the tools’ re-grinding or their replacement. This requires, among others, an enhancement of the key mechanical properties of the tool materials, by newer treatment route development. The current paper describes the impact of different heat treatment regimes, including austenitizing; sub-zero treatments; and tempering on the hardness, flexural strength, and toughness of tool steel, which is demonstrated upon Vanadis 6 steel. An improvement in the hardness due to the sub-zero treatment is reported, but it is also pointed out that both the flexural strength and fracture toughness of the material cannot be inevitably deteriorated by the application of this processing. Finally, it is demonstrated that both of these properties, despite their conflicting relationship, in most cases, can be improved simultaneously when the material is treated in the proper way.

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Microstructure and Hardness of Cold Work Vanadis 6 Steel after Subzero Treatment at −140°C

Cited by 8 publications

References 28 publications

Optimisation of Thermal Processes with Plasma Nitriding on Vanadis 4 High Speed Steel

Optimisation of Thermal Processes with Plasma Nitriding on Vanadis 4 High Speed Steel

Optimization of Quenching and Tempering Parameters for the Precipitation of M7C3 and MC Secondary Carbides and the Removal of the Austenite Retained in Vanadis 10 Tool Steel

Effect of Sub-Zero Treatment Temperatures on Hardness, Flexural Strength, and Fracture Toughness of Vanadis 6 Ledeburitic Die Steel

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