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By A. Niku-Lari and B. L. Mordike (Eds.)

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In this paper are some of the results obtained using the two different processes. EXPERIMENTAL Laser treatments were carried out using e cw C O 2 AVCO laser, at RTM Institute, Vico Canavese, Italy. The uniformity of the energy distribution on the spot was optimized by using a biaxial scanning system of the beam, with 1 0 * 1 0 mm mask to cut off lateral broadening. Argon was used as shielding gas, and all samples were coated by graphite dag in alcohol. Actual incident energy on treated surface was measured before and after any laser 49 50 run by a cone calorimeter.

6 and 5 um thicknesses proved to be unsuitable. - Pulsed wave: the tests with a pulsed wave laser beam, done with pulses of various durations and peak energies, gave very interesting results. In the treated zones a layer of surface alloying was obtained with structures containing between 40 % and 10 % chromium. The visual inspection did not show up any thermal or colour alterations in the copper. The Laser path on the chromium was regular and narrower than in the case with continuous wave 66 4 V Fig.

36 Fig. 8. Wear induced martensite near surface. A lower wear rate is measured for laser-melted tungsten steel. In Fig. 9 the wear volume is plotted against the number of turns. The variations in hardness across the surface cause only little difference in wear volumes. The plotted wear volumes are averaged values. Although hardnesses for different laser treatments vary, no large differences in wear rates are measured. In Table 3 the wear rates are summarized. Only the material that is melted at a scan speed of 5 cm/s results in a lower wear rate, although it has a worse running in performance.

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