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 HV _0.1 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.

中文翻译：

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初步冲蚀切割对VT6合金热化学处理及扩散层结构的影响

通过X射线衍射研究了经过各种类型的热化学处理（TCT）（氧化，渗氮，渗碳）的VT6合金的相组成和性能，包括在水中进行初步腐蚀切割的过程，光学显微镜和显微硬度测量。氧化后，合金的表面层中含有氧在α-Ti中的固溶体。Ti ₂ O ₃氧化物；以及氧化物的混合物Ti ₆ O ₁₁，Ti ₃ O ₅，Ti ₈ O ₁₅，Ti ₉ O ₁₇。渗氮导致氮在α-Ti和氮化钛TiN，Ti ₃ N ₂，Ti ₂ N和Ti ₄ N _3中的固溶体形成。渗碳后，发现碳在α-Ti和TiC碳化钛中固溶。在水中腐蚀切割后，氧在α-Ti中固溶；Ti ₂ O ₃，TiO，TiO ₂和Ti ₂ O氧化物；以及Ti ₆ O ₁₁，Ti ₃ O ₅，Ti ₈ O ₁₅和Ti ₉ O ₁₇的混合物在合金的表面层中形成氧化物。但是，在腐蚀切削过程中形成的氧化物不能在合金表面上形成连续层。结果，在随后的TCT中不会阻止传质，并且发现了固溶体以及钛与O，N或C的中间相。在这种情况下，在侵蚀切削过程中形成的氧化物相得以保留。 HV _0.1的显微硬度 测量表明，所有类型的在水中进行初步腐蚀切割的TCT都会导致表面硬度增加。在初步侵蚀切割中氧化后，这种增加最大，而在初步侵蚀切割中渗碳后，这种增加最小。