By Claude Brezinski
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When argon-ions sputtering was performed, the hydroxide contributions disappear but the oxide forms increase. 2 eV corresponding to the trivalent chromium hydroxide species . 8 eV which could be correspond to Cr in Cr4+ and Cr3+. Cr in the passive film was effective on improving the corrosion resistance . Figure 7: O1s XPS spectra for the chromium-passivated specimen. Figure 8: Cr2p XPS spectra for the chromium-passivated specimen. com, ISSN 1743-3533 (on-line) 34 Surface Effects and Contact Mechanics IX Figure 9: Fe2p XPS spectra for the chromium-passivated specimen.
Inoue, ASM International, Materials Park, Ohio, pp. 209-219, 2002. , Klepser, C. , Measurement and analysis of residual stress in ε-phase iron nitride layers as a function of depth, Advances in X-ray Analysis, 43, pp. 31-38, 2000. Sproge, L. , Analysis and control of nitriding and nitrocarburizing atmospheres. Proc. of the 2nd Int. Conf. On Carburizing and Nitriding with Atmospheres, eds. J. E. Morral, J. Grosch & M. Schneider, Elsevier: Cleveland, Ohio, 1995. com, ISSN 1743-3533 (on-line) This page intentionally left blank Surface Effects and Contact Mechanics IX 27 Dichromate effect on the passive layer of 316L stainless steel M.
The laser beam scanning speed influences the hardness inside laser tracks only slightly. Hardness of coatings is substantially higher than hardness of individual laser tracks made with the same laser beam scanning speeds that is probably raised by precipitation hardening presented during thermal cycling when laser tracks overlap occurs. The same thermal treatment leads to the substantial decrease of hardness inside HAZ, where a decomposition of martensite occurs. 0 Distance from subsrate/coating interface [mm] Vickers’ microhardness profiles measured on single laser tracks (left) and coatings prepared by different laser beam scanning speeds.