Login (DCU Staff Only)
Login (DCU Staff Only)

DORAS | DCU Research Repository

Explore open access research and scholarly works from DCU

Advanced Search

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

Aqida, S.N., Brabazon, Dermot orcid logoORCID: 0000-0003-3214-6381 and Naher, Sumsun orcid logoORCID: 0000-0003-2047-5807 (2013) An investigation of phase transformation and crystallinity in laser surface modified H13 steel. Applied Physics A: Materials Science & Processing, 110 (3). pp. 673-678. ISSN 1432-0630

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.
Metadata
Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:Laser surface modified H13 steel
Subjects:Physical Sciences > Chemistry
DCU Faculties and Centres:Research Initiatives and Centres > Materials Processing Research Centre (MPRC)
Publisher:Springer Verlag
Official URL:http://dx.doi.org/10.1007/s00339-012-7149-2
Copyright Information:© 2013 Springer. The original publication is available at www.springerlink.com
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
ID Code:20530
Deposited On:27 Mar 2015 11:45 by Fran Callaghan . Last Modified 20 Sep 2018 08:50
Documents

Full text available as:

[thumbnail of _Aqida_S_Applied_Physics_A_2013_Phase_transformation_in_laser_processing_of_H13.pdf]
Preview
PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
372kB
Downloads

Downloads

Downloads per month over past year

Archive Staff Only: edit this record