Characterization of vein-like structures formed in nitrided layers during plasma nitriding of 8Cr4Mo4V steel

Niu, Jiahong; Zhang, X.H.; Ma, Xinxin; Liu, Y.; Wang, L.Q.; Wu, T.B.

doi:10.1016/j.mtla.2022.101378

Cited by 8 publications

(6 citation statements)

References 23 publications

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“…The vein-like nitrides on the surface layer of the QTNL sample after laser shock modification were refined [21] (Figure 12c), reducing the adverse effects of impact toughness. At the same time, after laser modification, the residual compressive stress on the surface of the sample increased [23] (Figure 11), and the impact toughness significantly increased from 5.2 J/cm 2 to 10.79 J/cm 2 . According to the X-ray diffraction pattern (Figure 9), the main phase in the carburized and nitrided CQTN sample is the α phase.…”

Section: Microstructure Analysismentioning

confidence: 94%

“…At the same time, the residu pressive stress increased, leading to an increase in the impact toughness of the CQ ple [22]. According to the X-ray diffraction pattern (Figure 9), the main phase in the nitrided QTN sample is α phase, but vein-like nitrides can be observed in the microstructure of the surface layer (Figure 12) [23]. Nitride has high hardness and brittleness, which increases the surface hardness of the sample.…”

Section: Microstructure Analysismentioning

confidence: 99%

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The Effects of High-Energy Composite Surface Layer Modification on the Impact Performance of the H13 Steel Cutter Ring for Shield Tunneling Machine

Xu,

Li,

et al. 2023

Coatings

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The service life of the cutter ring of the shield tunneling machine affects the efficiency and cost of its tunneling. However, traditional heat treatment processes cannot simultaneously optimize both impact toughness and surface hardness, often leading to cracks or excessive wear of the cutter ring, greatly reducing their service life. According to the above situation, this paper applies high-energy composite modification treatment to H13 steel samples commonly used for the cutter ring of the hob and analyzes the impact toughness, hardness, microstructure, residual stress, and morphology characteristics of fracture of the samples under different high-energy composite modification processes. The study also investigates the effects of high-energy composite modification processes on the hardness and impact toughness of the samples. The experimental results show that the high-energy composite modification process enables the specimens to have good impact toughness and surface hardness simultaneously. The H13 steel sample has the best performance after carburizing, quenching, and laser shock modification, with a maximum surface hardness of 1017.5HV0.2 and an impact toughness of 15.64 J/cm2. Laser shock modification improves the surface residual compressive stress and hardness of H13 steel samples and also improves their impact toughness.

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Section: Microstructure Analysismentioning

confidence: 94%

Section: Microstructure Analysismentioning

confidence: 99%

The Effects of High-Energy Composite Surface Layer Modification on the Impact Performance of the H13 Steel Cutter Ring for Shield Tunneling Machine

Xu,

Li,

et al. 2023

Coatings

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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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“…Physical vapor deposition (PVD) [14][15][16] and conventional plasma nitriding (PN) are used most. [17][18][19][20][21] PN is a thermochemical process that can promote the formation of a diffusion layer characterized by α N (martensita expandida por nitrogênio) formation. [22] Furthermore, a surface layer of iron nitride (ε-Fe 3 N e γ 0 -Fe 4 N) and steel alloy elements, called a composite layer, presents high mechanical strength and wear resistance in parts with complex geometries.…”

Section: Introductionmentioning

confidence: 99%

Influence of Quenching and Tempering on the Tribological and Corrosion Behavior of Plasma‐Nitrided Society of Automotive Engineers 52100

Souza dos Reis Junior,

Cristino de Sousa Brito,

Abreu de Oliveira

et al. 2024

steel research int.

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Society of automotive engineers (SAE) 52100 (100Cr6) steel, used in manufacturing bearings and shafts, deserves attention due to wear and corrosion problems that cause machine losses in the industry. To solve these problems, heat treatments such as quenching and tempering are adopted to reduce wear mechanisms. However, in this work, the effect of these previous heat treatments on the final properties of plasma nitrided steel at three different temperatures (400, 450, and 500 °C) is evaluated. Surface hardness, tribological behavior, and corrosion resistance are evaluated. In the results of Vickers hardness, wear, and electrochemical analysis, it is shown that performing plasma nitriding at 400 and 450 °C on previously heat‐treated SAE 52100 steel provides better mechanical resistance and chemical integrity in a corrosive environment, making the studied steel more comprehensive for important industrial applications.

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Characterization of vein-like structures formed in nitrided layers during plasma nitriding of 8Cr4Mo4V steel

Cited by 8 publications

References 23 publications

The Effects of High-Energy Composite Surface Layer Modification on the Impact Performance of the H13 Steel Cutter Ring for Shield Tunneling Machine

The Effects of High-Energy Composite Surface Layer Modification on the Impact Performance of the H13 Steel Cutter Ring for Shield Tunneling Machine

Leveraging Deep Neural Networks for Estimating Vickers Hardness from Nanoindentation Hardness

Influence of Quenching and Tempering on the Tribological and Corrosion Behavior of Plasma‐Nitrided Society of Automotive Engineers 52100

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