| Abstrakt: |
The phase composition and the properties of the surface layer of the VT6 alloy subjected to various types of thermochemical treatment (TCT) (oxidation, nitriding, carburizing), including those with preliminary erosive cutting in water, have been studied by X-ray diffraction, optical microscopy, and microhardness measurements. After oxidation, the surface layer of the alloy contains the solid solution of oxygen in α-Ti; the Ti2O3 oxide; and a mixture of oxides Ti6O11, Ti3O5, Ti8O15, Ti9O17. Nitriding leads to the formation of solid solutions of nitrogen in α-Ti and the titanium nitrides TiN, Ti3N2, Ti2N, and Ti4N3. After carburizing, the solid solution of carbon in α-Ti and the TiC titanium carbide are found. After erosive cutting in water, the solid solution of oxygen in α-Ti; the Ti2O3, TiO, TiO2, and Ti2O oxides; and a mixture of the Ti6O11, Ti3O5, Ti8O15, and Ti9O17 oxides form in the surface layer of the alloy. However, the oxides formed during erosive cutting do not form a continuous layer on the surface of the alloy. As a result, mass transfer is not blocked during subsequent TCT and solid solutions and intermediate phases of titanium with O, N, or C are found. In this case, the oxide phases formed during erosive cutting are retained. Microhardness HV0.1 measurements showed that all types of TCT with preliminary erosive cutting in water lead to an increase in the surface hardness. This increase is maximal after oxidation with preliminary erosive cutting and is minimal after carburizing with preliminary erosive cutting. [ABSTRACT FROM AUTHOR] |
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