Study on the process optimization and wear resistance of electron beam cladding AlCoCrFeNi coating on 253MA austenitic stainless steel surface

Zhao, Guanghui; Zhang, Yu; Zhao, Hao; Li, Juan; Li, Huaying; Ma, Lifeng

doi:10.1016/j.matchar.2023.113341

Cited by 8 publications

(2 citation statements)

References 18 publications

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“…Figure 4a shows that the peak surface temperature immediately decreases from 1750 K to 1080 K at the cooling time of t = 12.5 s, i.e., the surface temperature of the specimen decreases by 690 K within 0.5 s, and the cooling rate reaches 1380 K/s. As the simulation process was conducted in vacuum, the surface of the 22CrMoH steel was free from the influence of gases and impurities during the scanning and cooling processes and generated a large amount of martensite [17]. Figure 4b,c reveal that the cooling rate of the surface temperature of the specimen decreases with increasing time.…”

Section: Numerical Simulation Model Of the Scanning Electron Beammentioning

confidence: 99%

“…This study mainly focuses on the changes in the microstructures and mechanical properties of gear steel after carburization under SEBP. The temperature field change of the scanning electron beam is analyzed by using the software of finite element analysis [17] to determine the optimal scanning parameters. The accuracy of the numerical simulation results usually affects the melting state of the material surface and the changes in the layer organization, wherein the influencing factors include the accelerating voltage [18], beam current magnitude, scanning rate process parameters, elemental distribution, grain size, and microstructure of influence of the regularity.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Scanning Electron Beam Pretreatment on Gas Carburization of 22CrMoH Gear Steel

Jiang,

Qu,

Liu

et al. 2024

Coatings

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22CrMoH was selected for the gear steel material in this work, and the temperature field change in the scanning electron beam was analyzed to determine the optimal scanning parameters and explored the effect of scanning electron beam pretreatment (Abbreviated as: SEBP) on gas-carburizing (GC) efficiency and organizational properties of gear steel. The results showed that the scanning electron beam caused the material to form a thermally deformed layer 110 μm thick, and it promoted the adsorption of carbon atoms on the surface and their inward diffusion. Under the same gas-carburizing conditions, the carburizing efficiency was improved, and the thickness of the carburized layer increased from 0.78 to 1.09 mm. Furthermore, the hardness of the GC specimens with the SEBP increased from 615 to 638 HV0.05 at 0.1 mm of the sample surface, whereas the hardness of the cross-sectional region decreased gradually, indicating that the scanning electron beam enhanced the adhesion between the carburized layer and matrix zone. A comparative analysis of the microstructures of the GC specimens with and without the SEBP showed that the carbide particles in the surface layer of the samples become smaller and that of volume fraction of residual austenite reduced in size. In terms of the mechanical properties, the surface friction coefficient decreased from 0.87 to 0.46 μ and the GC specimen with the SEBP had a higher cross-sectional hardness gradient. Its friction coefficient was reduced from approximately 0.8 to almost 0.45 μ, and the wear amount of the specimens with SEBP was 47.7% of that of the matrix specimens.

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Section: Numerical Simulation Model Of the Scanning Electron Beammentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%