A comparative assessment of the effects of laser shock peening and ultrasonic shot peening on surface integrity and ratcheting fatigue performance of HSLA steel

Dwivedi, Pushpendra Kumar; Sivateja, Chinnam; Rai, Arun Kumar; Ganesh, P.; Basu, Anindya; Dutta, Krishna

doi:10.1016/j.ijfatigue.2023.107902

Cited by 22 publications

(2 citation statements)

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“…The results showed that the weight percentage of carbon element in the melt zone reached 13.87%, which is much higher than that of 22CrMoH steel, and the content of carbon element in the three zones gradually decreased as a gradient until the change is uniform This indicated that the organization morphology changed significantly during the treatment. In addition, a distinct aggregation of carbon occurs in the scanned layer [32,33]. To investigate the elemental distribution of GC specimens under SEBP conditions, an elemental analysis of 22CrMoH steel was performed [31].…”

Section: Xrd and Energy-dispersive Spectroscopy (Eds) Analysismentioning

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: Xrd and Energy-dispersive Spectroscopy (Eds) Analysismentioning

confidence: 99%

“…This indicated that the organization morphology changed significantly during the treatment. In addition, a distinct aggregation of carbon occurs in the scanned layer [32,33].…”

Section: Xrd and Energy-dispersive Spectroscopy (Eds) Analysismentioning

confidence: 99%