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Laser surface modification of H13 die steel using different laser spot sizes

Aqida, S.N. and Naher, Sumsun and Brabazon, Dermot (2011) Laser surface modification of H13 die steel using different laser spot sizes. In: THE 14TH INTERNATIONAL ESAFORM CONFERENCE ON MATERIAL FORMING (ESAFORM 2011), 26-27 April 2011, Belfast, UK.

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Abstract

This paper presents a laser surface modification process of AISI H13 tool steel using three sizes of laser spot with an aim to achieve reduced grain size and surface roughness. 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). Metallographic study and image analysis were done to measure the grain size and the modified surface roughness was measured using two-dimensional surface profilometer. From metallographic study, the smallest grain sizes measured by laser modified surface were between 0.51 3m and 2.54 3m. The minimum surface roughness, Ra, recorded was 3.0 3m. This surface roughness of the modified die steel is similar to the surface quality of cast products. The grain size correlation with hardness followed the findings correlate with Hall-Petch relationship. The potential found for increase in surface hardness represents an important method to sustain tooling life.

Item Type:Conference or Workshop Item (Paper)
Event Type:Conference
Refereed:Yes
Uncontrolled Keywords:laser spot size; grain size; surface roughness
Subjects:Engineering > Materials
Engineering > Mechanical engineering
DCU Faculties and Centres:Research Initiatives and Centres > Materials Processing Research Centre (MPRC)
DCU Faculties and Schools > Faculty of Engineering and Computing > School of Mechanical and Manufacturing Engineering
Published in:Proceddings of the 14th International ESAFORM Conference on Material Forming. AIP Conference Proceedings 1353. American Insystute of Physics.
Publisher:American Insystute of Physics
Official URL:http://dx.doi.org/10.1063/1.3589660
Copyright Information:© 2011 American Institute of Physics
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
ID Code:16682
Deposited On:10 Nov 2011 16:03 by Fran Callaghan. Last Modified 10 Nov 2011 16:03

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