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The paper discusses a method of chemical polishing of Ti6Al4V samples and presents the results of our study. The samples were produced by selective laser melting, which is an increasingly popular method of producing thin-walled, geometrically complex products. The document analyzes how polishing with solutions featuring a varying content of hydrofluoric and nitric acids affects the etching rate and alters the superficial roughness of the samples in both the longitudinal and the transverse directions. We have thus formulated the recommendations on the optimum composition and concentration of such acidic solutions for polishing Ti6Al4V products made by selective laser melting.

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Continuous development of additive technologies and fast prototyping methods makes it possible to use them in manufacturing of complex shape models to a high precision. The traditional technological manufacture process of critical hot gas path parts by investment casting is expensive and time consuming in view of its technological complexity. It is related to the wax casting process which provides complex profiles with high geometrical accuracy. The acceleration of the investment casting process should increase the productivity of the manufacturing process of such hot gas path parts as the turbine stator, however, it is not allowed to decrease the geometric accuracy of the finished product. The aim of this work is to compare technological processes for manufacturing turbine stator parts at various temperatures using the fast prototyping method (wax casting in silicone molds). The dimensional analysis of the stator castings showed that casting in silicone molds provides the required geometric accuracy. Thus, silicone molds can be viewed as a good cost-effective solution for small-scale or pilot production of high-precision complex parts in gas turbine engines. This article describes the procedure for the integrated application of additive technologies and thermographic analysis to accelerate the investment casting process by determining the optimal temperature conditions and cooling period. Ultimately, it reduces the duration of the production cycle and the cost of the finished product while retaining the quality characteristics.