Effect of nitriding on the transformation of alloy carbides (VC and Mo2C) in 8Cr4Mo4V steel

Niu, Jiahong; Qureshi, Muhammad Waqas; Ding, Zongye; Ma, Xinxin; He, Yihui

doi:10.1016/j.apsusc.2022.155561

Cited by 21 publications

(5 citation statements)

References 40 publications

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“…Plasma nitriding treatment ensued, conducted within a glow ion nitriding furnace, an item of equipment custom-built by our research group. Plasma nitriding was facilitated through the active screen nitriding technique, thereby achieving a remarkably uniform nitriding layer [ 53 , 54 , 55 ]. A pulsed power supply (bias of 800 V, 40 kHz, adjustable duty cycle) was utilized for nitriding treatment.…”

Section: Methodsmentioning

confidence: 99%

Leveraging Deep Neural Networks for Estimating Vickers Hardness from Nanoindentation Hardness

Niu,

Miao,

Guo

et al. 2023

Materials

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This research presents a comprehensive analysis of deep neural network models (DNNs) for the precise prediction of Vickers hardness (HV) in nitrided and carburized M50NiL steel samples, with hardness values spanning from 400 to 1000 HV. By conducting rigorous experimentation and obtaining corresponding nanoindentation data, we evaluated the performance of four distinct neural network architectures: Multilayer Perceptron (MLP), Convolutional Neural Network (CNN), Long Short-Term Memory network (LSTM), and Transformer. Our findings reveal that MLP and LSTM models excel in predictive accuracy and efficiency, with MLP showing exceptional iteration efficiency and predictive precision. The study validates models for broad application in various steel types and confirms nanoindentation as an effective direct measure for HV hardness in thin films and gradient-variable regions. This work contributes a validated and versatile approach to the hardness assessment of thin-film materials and those with intricate microstructures, enhancing material characterization and potential application in advanced material engineering.

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Section: Methodsmentioning

confidence: 99%

Leveraging Deep Neural Networks for Estimating Vickers Hardness from Nanoindentation Hardness

Niu,

Miao,

Guo

et al. 2023

Materials

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“…Still, improvements and prospects are expected in the near future, with an observed large activity in the field [ 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 ]. Overall, a more detailed picture of the complex nitriding process could be obtained.…”

Section: Conclusion and Prospectsmentioning

confidence: 99%

Low Temperature Nitriding of Metal Alloys for Surface Mechanical Performance

Drouet

Bourhis

2023

Materials

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Metallic alloys are, by essence, ductile and stiff and can support loads without sudden rupture. This ductility becomes a disadvantage when applications require wear resistance. In this case, the hardening of the surface is required while retaining a core performance. Here, nitriding at low temperatures has proven to be beneficial and has potential. In fact, any phase transitions or unwanted compound precipitations that occur at higher temperatures have to be avoided as they would have a deleterious effect on the chemical homogeneity and mechanical properties. The present contribution summarizes the achievements made with such treatments on metallic alloys. We considered the most popular treatments, namely plasma, implantation, and gas nitridings.

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“…In these instances, appropriate surface treatments are required to improve the tribological performance. Research on 20CrNi2Mo steel has been focused mainly on conventional thermochemical treatments, including gas carburizing [4], plasma nitriding [5,6], and carbonitriding [7,8]. However, these single methods are not sufficient to afford the surface performance required for industry applications.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, compared to gas nitriding and salt bath nitriding, the plasma nitriding treatment time is shorter, the microstructures are more uniform, the deformation magnitudes are smaller, the energy cost is lower, and there is less pollution; thus, this method has received much attention for thermochemical surface modifications of steel. Most studies [19][20][21][22][23][24] on the wear behaviors of nitrided steels have shown a significant improvement in wear resistance; however, there are conflicting results suggesting that the presence of a CL forms hard particles that reduce the resistance to frictional wear.…”

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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Effect of nitriding on the transformation of alloy carbides (VC and Mo2C) in 8Cr4Mo4V steel

Cited by 21 publications

References 40 publications

Leveraging Deep Neural Networks for Estimating Vickers Hardness from Nanoindentation Hardness

Leveraging Deep Neural Networks for Estimating Vickers Hardness from Nanoindentation Hardness

Low Temperature Nitriding of Metal Alloys for Surface Mechanical Performance

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

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