Title: Observation and characterisation of the surface hardness enhancement of the laser remelted NiCrBSi coating
Authors: Jiangwei Liu; Song Chen; Yan Wang; Hu Li
Addresses: Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education, Shandong University, 250014 Jinan, China; Université de Technologie Belfort-Montbéliard, LERMPS, 90000 Belfort, France ' Department of Engineering Sciences, Uppsala University, 75121 Uppsala, Sweden ' Université de Technologie Belfort-Montbéliard, LERMPS, 90000 Belfort, France ' Department of Engineering Sciences, Uppsala University, 75121 Uppsala, Sweden; School of Electrical and Electronic Engineering, University of Manchester, M13 9PL Manchester, UK
Abstract: The hardness enhancement on the surface of the laser remelted NiCrBSi coating was observed and characterised by employing X-ray photoelectron microscopy and nanoindentation techniques. The result indicates that, under the line energy density of 80 J/mm, there is an agglomeration of the borides on the top 20 μm of the remelted coating that significantly enhanced the surface hardness as high as 1.5-fold stronger to 13 GPa than that of the main body of 8.5 GPa. Owing to the high concentration of the borides, the elemental distribution of the remelted surface has been modified significantly. In addition by varying the laser energy, the depth of the surface enhanced regions can be modified.
Keywords: laser remelting; NiCrBSi coating; surface hardness; tuneable depth.
International Journal of Surface Science and Engineering, 2018 Vol.12 No.4, pp.336 - 346
Received: 16 Mar 2018
Accepted: 01 Jul 2018
Published online: 07 Nov 2018 *