G. Lallemand et al., Influence of laser cladding on the surface hardness of small-diameter metallic wire substrates, MAT SCI E A, 277(1-2), 2000, pp. 192-197
In this study, a laser beam is used to clad stellite or cermet on various m
etallic wires. One aim is to realize a coating with a high volume compared
with that of the substrate (ratio about 1/5) without the use of auxiliary c
ooling. The thermal treatment induced during the coating can modify the pro
perties of the wire, for instance the restoration of the structure of the i
nitially cold drawn wire. This change of structure depends on the temperatu
re reached in the wire and on the cooling rate. In order to control the hea
t-affected zone (HAZ) in the wire, the thermal gradient in the cross-sectio
n is calculated under the laser beam, and results are correlated with micro
hardness profiles. It is shown that the HAZ is limited by the temperature o
f restoration, beginning at about 1300 K. (C) 2000 Published by Elsevier Sc
ience S.A. All rights reserved.