Abstract
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 results show that the behaviors of wear, corrosion and oxidation resistance were improved obviously for four kinds of ion implantation into H13 steel. The oxidation resistance of single Y implantation at 25 μA cm −2 is better than at higher fluxes. The wear and oxidation resistance of Y + C are better than those of Cr, Y and Y + Cr implantation. The corrosion resistance of high dose implantation is better than that of low dose implantation. The structural changes of the implanted layer before and after oxidation were measured by X-ray diffraction. An improvement in the above-mentioned properties is closely related to the structural change of yttrium-iron alloy and yttrium-iron oxidation compounds. The compounds were formed during a short-time (10 min) oxidation. Because of the compound formation, a strong Y atom concentration profile appeared. The shape of the profile is constant during oxidation at 800 °C for 40 min. Finally, the mechanism of influence of the oxidation compounds and the strange shape of the profile on the properties of the implanted layer is discussed.
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