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Spinodal decomposition in AISI 316L stainless steel via high-speedlaser remelting

Chikarakara, Evans orcid logoORCID: 0000-0002-0974-532X, Naher, Sumsun orcid logoORCID: 0000-0003-2047-5807 and Brabazon, Dermot orcid logoORCID: 0000-0003-3214-6381 (2014) Spinodal decomposition in AISI 316L stainless steel via high-speedlaser remelting. Applied Surface Science, 302 . pp. 318-321. ISSN 0169-4332

A 1.5 kW CO2 pulsed laser was used to melt the surface of AISI 316L stainless steel with a view to enhancing the surface properties for engineering applications. A 90 m laser beam spot size focused onto the surface was used to provide high irradiances (up to 23.56MW/cm2) with low residence times (as low as 50 s) in order to induce rapid surface melting and solidification. Variations in microstructure at different points within the laser treated region were investigated. From this processing refined lamellar and nodular microstructures were produced. These sets of unique microstructures were produced within the remelted region when the highest energy densities were selected in conjunction with the lowest residence times. The transformation from the typical austenitic structure to much finer unique lamellar and nodular structures was attributed to the high thermal gradients achieved using these selected laser processing parameters. These structures resulted in unique characteristics including elimination of cracks and a reduction of inclusions within the treated region. Grain structure reorientation between the bulk alloy and laser-treated region occurred due to the induced thermal gradients. This present article reports on microstructure forms resulting from the high-speed laser surface remelting and corresponding underlying kinetics.
Item Type:Article (Published)
Uncontrolled Keywords:Laser remelting; Spinodal decomposition; Lamellar and nodular structures316L; Stainless steel
Subjects:Engineering > Materials
Engineering > Mechanical engineering
DCU Faculties and Centres:Research Institutes and Centres > Advanced Processing Technology Research Centre (APTRC)
Official URL:http://dx.doi.org/10.1016/j.apsusc.2013.10.099
Copyright Information:© 2014 Elsevier
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
ID Code:20543
Deposited On:01 Apr 2015 13:22 by Fran Callaghan . Last Modified 18 May 2023 13:10

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