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

Ahmed Obeidi, Muhannad orcid logoORCID: 0000-0003-2733-3828, McCarthy, Éanna, Kailas, Lekshmi and Brabazon, Dermot orcid logoORCID: 0000-0003-3214-6381 (2017) Laser surface texturing of stainless steel 316L cylindrical pins for interference fit applications. Journal of Materials Processing Technology, 252 . pp. 58-68. ISSN 0924-0136

Abstract
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.
Metadata
Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:Interference fit; Press fit; CO2 laser processing; Stainless steel; Surface texturing; Moiré pattern.
Subjects:Engineering > Mechanical engineering
DCU Faculties and Centres:Research Institutes and Centres > Advanced Processing Technology Research Centre (APTRC)
DCU Faculties and Schools > Faculty of Engineering and Computing > School of Mechanical and Manufacturing Engineering
Publisher:Elsevier
Official URL:https://doi.org/10.1016/j.jmatprotec.2017.09.016
Copyright Information:© 2018 Elsevier
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:Enterprise Ireland under grant CF/2014/2619.
ID Code:22307
Deposited On:29 Mar 2018 14:57 by Thomas Murtagh . Last Modified 12 Aug 2021 09:43
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