Journal Article


Sumsun Naher
Dermot Brabazon
S.N. Aqida



laser surface modified h13 steel diffraction analysis x ray diffraction laser surface modification phase transformation chemistry peak power aisi h13 tool steel

An investigation of phase transformation and crystallinity in laser surface modified H13 steel (2013)

Abstract This paper presents a laser surface modification process of AISI H13 tool steel using 0.09, 0.2 and 0.4 mm size of laser spot with an aim to increase hardness properties. A Rofin DC-015 diffusion-cooled CO2 slab laser was used to process AISI H13 tool steel samples. Samples of 10 mm diameter were sectioned to 100 mm length in order to process a predefined circumferential area. The parameters selected for examination were laser peak power, overlap percentage and pulse repetition frequency (PRF). X-ray diffraction analysis (XRD) was conducted to measure crystallinity of the laser-modified surface. X-ray diffraction patterns of the samples were recorded using a Bruker D8 XRD system with Cu K α (λ=1.5405 Å) radiation. The diffraction patterns were recorded in the 2θ range of 20 to 80°. The hardness properties were tested at 981 mN force. The laser-modified surface exhibited reduced crystallinity compared to the un-processed samples. The presence of martensitic phase was detected in the samples processed using 0.4 mm spot size. Though there was reduced crystallinity, a high hardness was measured in the laser-modified surface. Hardness was increased more than 2.5 times compared to the as-received samples. These findings reveal the phase source of the hardening mechanism and grain composition in the laser-modified surface.
Collections Ireland -> Dublin City University -> Publication Type = Article
Ireland -> Dublin City University -> Subject = Physical Sciences: Chemistry
Ireland -> Dublin City University -> Status = Published
Ireland -> Dublin City University -> Subject = Physical Sciences
Ireland -> Dublin City University -> DCU Faculties and Centres = Research Initiatives and Centres: Materials Processing Research Centre (MPRC)
Ireland -> Dublin City University -> DCU Faculties and Centres = Research Initiatives and Centres

Full list of authors on original publication

Sumsun Naher, Dermot Brabazon, S.N. Aqida

Experts in our system

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