H. Haferkamp et al., LASER ALLOYING OF PLASMA-SPRAYED MOLYBDEN UM LAYERS INTO STEEL SURFACES TO INCREASE WEAR-RESISTANCE, Metall, 49(7-8), 1995, pp. 516-522
Investigations were carried out concerning laser alloying of molybdenu
m on steel surfaces for increased weer. During the investigations, mol
ybdenum was pre-deposited on the steel surfaces by plasma spraying and
subsequently fused by means of Nd:YAG laser radiation (cw). To gain a
n extended process understanding, a video camera; sound emission analy
sis and a bond pyrometer were used for process monitoring. The alloyed
zones produced were examined using different test methods, such as el
ectron disperse X-ray analysis (EDX). Adhesive wear tests were carried
out with a pin-on-disc apparatus. In this paper, the employed process
equipment and results concerning laser alloying of different pre-depo
sited molybdenum coatings will be presented. The process monitoring sy
stem used is a suitable medium for defining the beam/material interact
ion. Using the sound emission analysis, for example, if was possible t
o qualitatively evaluate the crack intensity during allaying. The meas
urements of the leading surface temperature of the molten pool using a
pyrometer permits a correlation to the molybdenum content in the allo
yed rone, which plays an important role with regard to crack intensity
and wear behavior.