Influence of laser processing of the low alloy medium carbon structural steel on the development of the fatigue crack

Szkodo, Marek; Bień, Anna

doi:10.1016/j.surfcoat.2016.04.032

Cited by 10 publications

(3 citation statements)

References 20 publications

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“…Studies in the past six decades have tried to innovate a practical solution to this problem with limited implications for the shaft-hub interference, the elastic-plastic deformation calculations, and design. Surface modification has been shown in the literature to allow for the production of components with higher hardness (Yasavol et al, 2013), wear resistance (Rosenkranz et al, 2014), and fatigue life (Szkodo and Bie, 2016). These treatments have a variety of applications in industry and biomedical implants.…”

mentioning

confidence: 99%

Laser surface texturing of stainless steel 316L cylindrical pins for interference fit applications

Obeidi

McCarthy

Kailas

et al. 2018

Journal of Materials Processing Technology

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This study is focused on the development of a novel method for designing high-end interference fit fasteners. In this work, a new surface laser treatment process was utilized to enable enhanced usability and bond strength control of press-fit connections. Cylindrical 10 mm diameter pins of 316L were textured over a 10 mm length using a pulsed CO2 laser beam focused one millimeter below the surface, with the thermal energy adjusted to bring the surface to just above the melting point of the metal. The pin surface morphology and dimensions were precisely controlled by controlling the laser processing parameters specifically the laser beam power, the pulse repetition frequency, and the overlap between scan tracks. The pin was inserted into a hub hole diameter of 10.05±0.003 mm and pull out joint bond strengths were examined. The results of this study showed that surface thus altered provided improved control of the bond strength which is a particular novelty of this new interference fit joining method. Surface roughness, Ra, from 40 to 160 µm, melt pool depths from 0.4 to 1.7 mm, increases in the pin outer diameter from 0.5 to 1.1 mm, and pull out forces of up to 7.51 kN were achieved. The bond joint was found to re-grip before final failure providing a more secure joint and increased safety. This joining method allows for the possibility of joining different materials. The pulse repetition frequency was measured to be the most significant processing parameter for control of the resulting mechanical properties and the bond strength with a clear inverse relationship.

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confidence: 99%

Laser surface texturing of stainless steel 316L cylindrical pins for interference fit applications

Obeidi

McCarthy

Kailas

et al. 2018

Journal of Materials Processing Technology

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“…Our previous studies demonstrated that the corner frequency is found similar to average decay length, and hence to average grain diameter [28,29]. As a quick characterization tool, fractal analysis proved to be useful in studies of morphology and mechanical properties of various surface structures upon heat treatment [30][31][32], nanomechanical processing [33,34], in contact with body tissues and fluids [35][36][37][38]. Obtained results established a bridge between specific geometry of residual surface and its tribological and physical characteristics [39][40][41].…”

Section: Surface Texture Analysis From Afmmentioning

confidence: 78%

Micromorphology analysis of sputtered indium tin oxide fabricated with variable ambient combinations

et al. 2018

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“…The microstructure and phase transformations in steel are affected by alloy composition system, minor differences in the content of certain alloy elements, rolling process and cooling process and so on. There could be ferrite, pearlite, widmanstatten ferrite, troostite, granular bainite and others in the microstructure [7][8][9][10][11][12][13][14][15]. The CCT curve of steel reflects the transformation rule of undercooled austenite in continuous cooling process, which has important guiding significance for heat treatment and post-rolling control technology [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Continuous Cooling Phase Transformation Rule of 20CrMnTi Low-Carbon Alloy Steel

Li¹,

Liao³

et al. 2019

MSF

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Gear steel is a ferritic steel. In the rolling process, the ideal structure is ferrite + pearlite, and bainite or martensite is not expected. However, due to the high alloy content, the hardenability is good, and the bainite or martensite structure is very likely to be generated upon cooling after rolling. In this paper, phase transformation rules during continuous cooling of 20CrMnTi with and without deformation were studied to guide the avoidance of the appearance of bainite or martensite in steel. A combined method of dilatometry and metallography was adopted in the experiments, and the dilatometer DIL805A and thermo-simulation Gleeble3500 were used. Both dynamic and static continuous cooling transformation (CCT) diagrams were drawn by using the software Origin. The causes of those changes in starting temperature, finishing temperature, starting time and transformation duration in ferrite-pearlite phase transformation were analyzed, and the change in Vickers hardness of samples with different cooling rate was discussed. The results indicate that with different cooling rate, there are three phase transformation zones: ferrite-pearlite, bainite and martensite. Deformation of austenite accelerates the occurrence of transformation obviously and moves CCT curve to left and up direction. When the cooling rate is lower than 1 °C/s, the phases in samples are mainly ferrite and pearlite, which is the ideal microstructure of experimental steel. As the cooling rate increases, starting temperature of ferrite transformation in steel decreases, starting time reduces, transformation duration gradually decreases, and the Vickers hardness of samples increases. Under the cooling rate of 0.5 °C/s, ferrite transformation in deformed sample starts at 751.67 °C, ferrite-pearlite phase transformation lasts 167.9 s, and Vickers hardness of sample is 183.4 HV.

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Influence of laser processing of the low alloy medium carbon structural steel on the development of the fatigue crack

Cited by 10 publications

References 20 publications

Laser surface texturing of stainless steel 316L cylindrical pins for interference fit applications

Laser surface texturing of stainless steel 316L cylindrical pins for interference fit applications

Micromorphology analysis of sputtered indium tin oxide fabricated with variable ambient combinations

Continuous Cooling Phase Transformation Rule of 20CrMnTi Low-Carbon Alloy Steel

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