Type

Journal Article

Authors

Dermot Brabazon
Sumsun Naher
Evans Chikarakara

Subjects

Engineering

Topics
materials mechanical engineering lamellar and nodular structures316l laser spot size spinodal decomposition 316l stainless steel laser remelting stainless steel

Spinodal decomposition in AISI 316L stainless steel via high-speedlaser remelting (2014)

Abstract 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.
Collections Ireland -> Dublin City University -> Publication Type = Article
Ireland -> Dublin City University -> Status = Published
Ireland -> Dublin City University -> Subject = Engineering: Mechanical engineering
Ireland -> Dublin City University -> DCU Faculties and Centres = Research Initiatives and Centres: Advanced Processing Technology Research Centre (APTRC)
Ireland -> Dublin City University -> Subject = Engineering: Materials
Ireland -> Dublin City University -> Subject = Engineering
Ireland -> Dublin City University -> DCU Faculties and Centres = Research Initiatives and Centres

Full list of authors on original publication

Dermot Brabazon, Sumsun Naher, Evans Chikarakara

Experts in our system

1
Dermot Brabazon
Dublin City University
Total Publications: 162
 
2
Sumsun Naher
Dublin City University
Total Publications: 56