Gaseous nitriding behaviour of 33CrMoV12-9 steel: Evolution of the grain boundaries precipitation and influence on residual stress development

Jegou, Sébastien; Barrallier, Laurent; Fallot, Guillaume

doi:10.1016/j.surfcoat.2018.01.068

Cited by 22 publications

(3 citation statements)

References 19 publications

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“…Traditional gas nitriding (TGN), a typical thermochemical surface treatment, has been particularly effective in improving the hardness, wear resistance and fatigue properties of steels through the development of a unique gradient structure with the outermost compound layer (CL) and subsurface diffusion zone. The CL consisting of a heterogeneous mixture of ε-Fe2-3N and γ′-Fe4N phases presents a relatively high hardness, which makes a positive contribution to wear resistance under light loads [7][8][9]. However, this layer suffers from high internal stress, which makes it friable and brittle, and will be crushed under conditions of impact and/or heavy loads [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Enhancing heavy load wear resistance of AISI 4140 steel through the formation of a severely deformed compound-free nitrided surface layer

Wang

Liu

Zhang

et al. 2018

Surface and Coatings Technology

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Section: Introductionmentioning

confidence: 99%

Enhancing heavy load wear resistance of AISI 4140 steel through the formation of a severely deformed compound-free nitrided surface layer

Wang

Liu

Zhang

et al. 2018

Surface and Coatings Technology

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“…The reduction in creep rate of carburized material can be attributed to the presence of carbides which precipitated during pre-conditioning, significantly modifying the local material properties, including increasing the material strength and the materials resistance to creep deformation. Additionally, it is worth mentioning that near-surface carburization due to pre-conditioning would induce compressive residual stresses, beneficial for the creep resistance of the material, as a consequence of carbon ingress and subsequent carbide precipitation [36].…”

Section: Creep Performancementioning

confidence: 99%

Creep performance of carburized 316H stainless steel at 550 °C

Eaton-Mckay

Yan

Callaghan

et al. 2022

Journal of Nuclear Materials

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“…On the surface of the material, the compound layer consists of ε-Fe 2−3 N, and γ -Fe 4 N phase should be formed [11,12]. This type of layer is very hard and brittle with good friction and anticorrosion properties [13,14]. Thickness and microhardness of γ -Fe 4 N often depend on quantity and quality of nitride alloying elements [15,16].…”

Section: Introductionmentioning

confidence: 99%

Influence of alloying elements on gas nitriding process of high-stressed machine parts of weapons

Pokorny¹,

Dobrocký²,

Kadlec³

et al. 2018

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The chemical composition of the steel is one of the primary characteristics that influence the mechanical properties of high-stressed machine parts such as barrels of small arms weapon. Heat treatment is the most important technology to reach requested mechanical properties. By a suitable combination of mechanical and tribological properties, it is possible to improve the surface of highly stressed parts as to improve the wear resistance of barrel surface. Thus, surface technology is next step for obtaining new properties as tribological properties or preferable mechanical properties. Due to obtain suitable microstructure and wear resistance the samples of C35, 34Cr4, 37Cr4 and 42CrMo4 were heat-treated with following chemical heat treatment by gas nitriding process, for 6 hours. This paper deals with the influence of alloying elements of structural steels on surface microhardness and depth of diffusion layer. The gas nitriding process caused the creation of a compound layer on the surface of the steel. This layer leads to significant improvement in wear resistance. The concentration of alloying elements was analysed by OES methods. The technology of nitriding was applied to annealed, tempered and quenched steels. After chemical heat treatment, new surface morphology was created. The surface layers of the samples were analysed by microhardness method; surface morphology was evaluated by SEM method. Experimental part concerns structural steels with a concentration of alloying elements to 1 wt.%. In experimental part, the influence of alloying elements on the diffusion process in Fe-C system and the microhardness of the surface was proved.K e y w o r d s : gas nitriding, microhardness, chemical composition, diffusion, barrel

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Gaseous nitriding behaviour of 33CrMoV12-9 steel: Evolution of the grain boundaries precipitation and influence on residual stress development

Abstract: is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible.This is an author-deposited version published in: https://sam.ensam.eu Handle

Cited by 22 publications

References 19 publications

Enhancing heavy load wear resistance of AISI 4140 steel through the formation of a severely deformed compound-free nitrided surface layer

Enhancing heavy load wear resistance of AISI 4140 steel through the formation of a severely deformed compound-free nitrided surface layer

Creep performance of carburized 316H stainless steel at 550 °C

Influence of alloying elements on gas nitriding process of high-stressed machine parts of weapons

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