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Title: Laser surface modification of various tool steels for improving hardness and corrosion resistance
Authors: Kwok, CT
Cheng, FT
Man, HC 
Leong, KI
Keywords: Hardness and corrosion
Laser surface modification
Tool steels
Issue Date: 2008
Publisher: Scientific.Net
Source: Key engineering materials, 2008, v. 384, p. 125-155 How to cite?
Journal: Key engineering materials 
Abstract: Laser surface modification of nine tool steels, namely, plastics mold steels (PMSs), high-speed steels (HSSs) and cold/hot-work steels (CHWSs), was achieved by means of a CW Nd:YAG laser. The microstructure and the phases present in the surface of the specimens were analyzed by optical microscopy, scanning-electron microscopy and X-ray diffractometry. The surface hardness of the specimens was measured using a Vickers microhardness tester. The corrosion characteristics of the laser surface-melted steels in 3.5 wt% NaCl solution at 25°C were studied by potentiodynamic polarization technique. The microstructures of the surface of the steels were changed completely after laser surface melting. Some steels showed improved corrosion resistance compared with the conventionally hardened specimens due to dissolution of the alloying elements in solid solution. The hardness and corrosion characteristics of all the laser surface-melted specimens are strongly dependent on the amount of passivating elements in solid solution and also on the morphology of the re-precipitated carbides. Both these factors depend on the laser processing parameters and the substrate compositions.
ISSN: 1013-9826
EISSN: 1662-9795
DOI: 10.4028/0-87849-372-7.125
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