Application of massive laser shock processing for improvement of mechanical and tribological properties

Trdan, Uroš (author), Skarba, M. (author), Porro, Juan Antonio (author), Ocaña, José Luis (author), Grum, Janez (author)

The present paper aims to investigate topographical, microstructural, mechanical and tribological behaviour of precipitation hardened Al alloy subjected to massive laser shock processing (LSP) without protective coating at 2500 pulses/cm2, using three beam diameters. Wear tests under dry sliding conditions resulted in severe wear, whereas the main wear mechanisms were adhesion accompanied by abrasive wear. Nevertheless, LSP with optimal processing parameters reduce the friction coefficient and wear rate with lower degrees of adhesion and abrasion inside the wear track in comparison to the untreated sample. The enhanced tribological performance is attributed to the positive influence of LSP induced surface topography, surface compressive residual stresses (RS) and dense dislocation arrangements, as the result of high-pressure shock waves. Nonetheless, due to the narrow window of optimal parameters reduced wear resistance as a consequence of undesired thermal/softening effect due to laser ablation and melting was detected with non-optimal processing parameters.

• Language: English
• Keywords: laser shock processing, aluminium alloy, wear, microhardness, residual stress, microstructure
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Author Accepted Manuscript
• Submitted for review: 15.11.2017
• Article acceptance date: 21.02.2018
• Publication date: 15.03.2018
• Year: 2018
• Number of pages: Str. 1-11
• Numbering: Vol. 342
• PID: 20.500.12556/RUL-127244
• UDC: 620.1(045)
• ISSN on article: 0257-8972
• DOI: 10.1016/j.surfcoat.2018.02.084
• COBISS.SI-ID: 15941915
• Publication date in RUL: 28.05.2021

Record is a part of a journal

• Title: Surface & coatings technology
• Shortened title: Surf. coat. technol.
• Publisher: Elsevier
• ISSN: 0257-8972
• COBISS.SI-ID: 3084815

Licences

• License: CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Description: The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
• Licensing start date: 25.05.2018

Secondary language

• Language: Slovenian
• Keywords: lasersko udarno utrjevanje, aluminijeva zlitina, obraba, mikrotrdota, zaostale napetosti, mikrostruktura

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0270
• Name: Proizvodni sistemi, laserske tehnologije in spajanje materialov