Table of Contents
Laser Chemistry
Volume 13, Issue 2, Pages 121-128
http://dx.doi.org/10.1155/1993/72409

Excimer Laser Used as a Materials Characterization Tool: Sulphide Inclusion Printing in Steel

1University of Illinois, Urbana 61801, IL, USA
2MIRTEC S.A., A’ Industrial Area of Volos, Volos GR-385 00, Greece
3University of Thessaly, Volos GR-38334, Greece
4FORTH-IESL, P.O. Box 1527, Heraklio GR-711 10, Greece

Received 5 September 1992

Copyright © 1993 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

An application of the excimer laser in the area of material characterization making use of its ablative ability to perform surface sulphur printing is presented. It is shown that the differential ablative and surface melting capability of the excimer laser is useful in microetching sulphide inclusions in flat polished steel samples and rough fracture surfaces. An optimum laser fluence is found to be that which melts the sulphide particles without significant melting of the steel matrix or causing overlap of the characteristic halo formed by the out-flowing liquid from the sulphides. The geometric similarity of the sulphide inclusions is maintained and its spatial extent is amplified about 10 times. This brings sub-micron sulphide particles into optical resolution range. The liquid wetting behavior of the sulphide liquid is variable with Mn/Fe ratio and determines the extent of the halo formation.