INFLUENCE OF THE STRUCTURE OF IMPLANTED STEEL WITH Y, Y-RESISTANCE(C AND Y+CR ON THE BEHAVIORS OF WEAR, OXIDATION AND CORROSION)

New methods were studied to improve the properties of corrosion, wear and oxidation resistance of implanted H13 steel using ions of Y, Cr, Y + C and Y + Cr, produced by a pulsed metal ion source (MEVVA). The re sults show that the behaviors of wear, corrosion and oxidation resista nce were improved obviously for four kinds of ion implantation into H1 3 steel. The oxidation resistance of single Y implantation at 25 mu A cm(-2) is better than at higher fluxes. The wear and oxidation resista nce of Y + C are better than those of Cr, Y and Y + Cr implantation. T he corrosion resistance of high dose implantation is better than that of low dose implantation. The structural changes of the implanted laye r before and after oxidation were measured by X-ray diffraction. An im provement in the above-mentioned properties is closely related to the structural change of yttrium-iron alloy and yttrium-iron oxidation com pounds. The compounds were formed during a short-time (10 min) oxidati on. Because of the compound formation, a strong Y atom concentration p rofile appeared. The shape of the profile is constant during oxidation at 800 degrees C for 40 min. Finally, the mechanism of influence of t he oxidation compounds and the strange shape of the profile on the pro perties of the implanted layer is discussed.