Surface transformation of DF-2 steel after continuous mode laser irradiation

M. Hua; null SeDao; T. M. Shao; H. Y. Tam

doi:10.1016/j.jmatprotec.2007.04.037

Author(s)

M. Hua
SeDao
T. M. Shao
H. Y. Tam

Detail(s)

Original language	English
Pages (from-to)	89-96
Journal / Publication	Journal of Materials Processing Technology
Volume	192-193
Publication status	Published - 1 Oct 2007

Link(s)

DOI	DOI https://doi.org/10.1016/j.jmatprotec.2007.04.037 Final Published version
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Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-34547515046&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(3a77073c-3e10-477c-8de7-37ed60ad2a4e).html

Abstract

Successive irradiation of DF-2 cold work tool steel was performed using a Nd:YAG millisecond pulsed laser with different feed rates in the range of 1-4 mm/s. Influence of the laser feed rate on the surface morphologies of the irradiated area was investigated by scanning electron microscopy (SEM), energy dispersion spectroscopy (EDX) and three-dimensional Talysurf surface profilometer. Results showed the changes of surface morphology were depended on (i) the interactive nature of the surface with the irradiating laser; (ii) the feed rate of the laser; (iii) surface melting or phase transformation. Correlation of the changes of morphology with the measurements of surface roughness indicated that surface smoothening was normally obtainable at a relatively higher irradiating laser feed rate, and phase transformation would likely be an important mechanism in coalesce of original machining furrows for smoothening the irradiated surface. © 2007 Elsevier B.V. All rights reserved.