Study of M50NiL steel under carburizing and nitriding duplex treatment

Li, Guomeng; Liang, Yilong; Yin, Cunhong; Sun, Hao; Zhu, Zhenlong

doi:10.1016/j.surfcoat.2019.07.017

Cited by 31 publications

(10 citation statements)

References 26 publications

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“…A detailed study on the early stage of composite carburizing of M50NiL steel was conducted. Vein-like precipitates were observed in the diffusion layer, but the mechanism of their formation was not discussed in detail [2][3][4][5]. In this study, carburized M50NiL steel was subjected to plasma-nitriding treatment and water jet shot pre-treatment followed by nitriding treatment.…”

Section: Introductionmentioning

confidence: 93%

“…M50NiL martensitic steel is a low carbon secondary hardening steel with high contents of Cr, Mo, Ni and V alloying elements [1]. Its fracture toughness is more than twice that of M50 steel [2]. A new generation of high-strength aero-engine gears requires bearing steel with excellent surface properties in order to operate under heavy loads at high speeds, high temperatures and other harsh service conditions.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Pre-Modification by Water Jet Blasting Prior to Nitriding Vein-Like Precipitates in the Composite Diffusion Layer of M50NiL Steel

Chen

et al. 2023

Coatings

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In this study, M50NiL steel was carburized (C), nitrided (N), and compound-carburized then nitrided (C + N). Vein-like grain boundaries (VLGBs) were observed in the diffusion layers of both the N and C + N states due to the limited opportunity for diffusion. Transmission electron microscopy (TEM) observation revealed that the VLGB organization differed in the N and C + N states. The VLGB organization consisted mainly of Fe4N in the N state and Fe3C and Fe4N in the C + N state. When the C state was pre-modified by a 200 MPa water jet and then nitrided (C + 200P + N), the increase in dislocation density resulted in a dislocation entanglement phenomenon that split the grains to form subcrystals. The increases in grain boundaries and dislocation density promoted the diffusion of atoms, and thus the VLGB structure was not observed in the diffusion layer of the C + 200P + N state.

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Effect of Pre-Modification by Water Jet Blasting Prior to Nitriding Vein-Like Precipitates in the Composite Diffusion Layer of M50NiL Steel

Chen

et al. 2023

Coatings

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“…In the previous paper [25][26][27][28], we studied the duplex treatment technology of M50NiL high-alloy steel by combining carburizing and nitriding and studied the formation mechanism, morphology, composition and structure, as well as the wear and tension fatigue properties of the steel in detail. To the best knowledge of the authors, there are few reports on the biphasic process involving carburizing followed by plasma nitriding of 20CrNi2Mo low-alloy steel, and how these processes improve wear performance remains to be explored.…”

Section: Introductionmentioning

confidence: 99%

Effect of carburizing and nitriding duplex treatment on the friction and wear properties of 20CrNi2Mo steel

Chen

Li²,

Liang³

et al. 2023

Mater. Res. Express

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In this study, the responses of 20CrNi2Mo steel to carburizing (C) and carburizing-nitriding (C+N) duplex treatment and the effects of these treatments on the friction and wear properties were systematically studied. The 20CrNi2Mo surface layers were characterized by optical microscopy (OM), laser scanning confocal microscopy (LSCM), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Vickers microhardness tests and high-speed reciprocating friction and wear testing. The results showed that after the carburizing and nitriding duplex treatment, an approximately 5 μm-thick compound layer (CL) consisting of the γ′-Fe4N and ε-Fe2-3N phases had formed on the surface, and the diffusion layer depth was approximately 220 μm. The carbides (MC) stored during carburizing were easily converted to nitrides (MN) during the nitriding process. Furthermore, the surface microhardness (879 HV) was increased by a factor of 2 compared with the substrate (420 HV), the surface residual compressive stress (-652 MPa) was increased significantly, and the surface roughness also increased. Wear analyses under different loads showed that specimen C exhibited the worst wear resistance, and its wear mechanism was mainly abrasive wear. The C+N with CL samples showed excellent wear resistance under a 20-N load; after removing the CL samples (C+N with CL), they showed excellent wear resistance under a 40-N load, and the wear mechanism was mainly adhesive wear. This work showed that the wear resistance was improved significantly by the carburizing and nitriding duplex treatment, but the CL had different effects on the wear performance under different loads.

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“…M50NiL bearing steel is widely used in the aerospace eld because of its strength and plasticity matching, high-temperature resistance, and good fatigue performance [1,2]. e few available studies on M50NiL steel have mainly focused on carburizing, nitriding, and thermal deformation processes [3][4][5][6][7][8][9][10]. In recent years, with the advances in iron and steel metallurgy and progress of social science and technology, numerous alloying elements have been introduced into iron and steel materials to develop new steel grades [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Elimination and Control of δ Ferrite in M50NiL Bearing Steel

Lang

et al. 2022

Advances in Materials Science and Engineering

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In this study, the effects of the annealing temperature and holding time on the δ ferrite content in M50NiL bearing steel are evaluated. The results indicate that when the temperature increases from 900°C to 1200°C, the δ ferrite content increases as a result of the increase in the Cr equivalent in the matrix, which decreases the stability of austenite and promotes the transformation of γ ⟶ δ. At 1300°C, the δ ferrite content sharply increases because the austenite transforms into δ ferrite in large quantities when heated to the γ + δ phase region. When the steel is annealed at 1200°C, the content of δ ferrite first decreases and then increases with increasing holding time (0.5–50 h). Meanwhile, the δ ferrite content reaches the lowest value of 3.5% after 30 h of annealing. The decrease in the δ ferrite content is attributed to the increase in the Ni equivalent in δ ferrite, which promotes the transformation from δ ferrite to austenite. The increase in the δ ferrite content is attributed to the diffusion of Mo and V ferrite-forming elements into grains, resulting in the nucleation of a large amount of δ ferrite.

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Study of M50NiL steel under carburizing and nitriding duplex treatment

Cited by 31 publications

References 26 publications

Effect of Pre-Modification by Water Jet Blasting Prior to Nitriding Vein-Like Precipitates in the Composite Diffusion Layer of M50NiL Steel

Effect of Pre-Modification by Water Jet Blasting Prior to Nitriding Vein-Like Precipitates in the Composite Diffusion Layer of M50NiL Steel

Effect of carburizing and nitriding duplex treatment on the friction and wear properties of 20CrNi2Mo steel

Elimination and Control of δ Ferrite in M50NiL Bearing Steel

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