Study of the physico-thermomechanical properties of the Ti-4.25Al-2V dispersion-hardened metal ceramics with SiC addition manufactured by the direct laser growing

Development of the additive technologies application in metals envisages an increasing interest in research aimed at improving functional characteristics of the aircraft parts. One of the main approaches is addition of the ceramic particles (oxide, carbide and nitride ceramics) to the metal powders and development of the technological modes. The paper presents results of the conducted research to forecast physical and mechanical characteristics of the dispersion-hardened composite material manufactured using the direct laser growing technology. The research object is the Ti-4.25Al-2V titanium alloy with the addition of 1% SiC ceramic particles. The paper considers a multiscale approach to simulation at the micro- and macro-levels. At the micro-level, a representative element of the dispersion-hardened composite material volume is constructed taking into account the SiC particles shape to forecast the rigidity and strength characteristics, including their dependence on the temperature. At the macro-level, numerical simulation is applied to study the features of plastic deformation and fracture of the samples made of the Ti-4.25Al-2V titanium alloy with addition of the 1 % SiC ceramic particles produced using the direct laser growing technology. Simulation is performed using the ANSYS and MSC.Digimat commercial software packages. The paper shows that addition of the SiC particles leads to an increase in the alloy physical and mechanical properties, including those at the temperatures of up to 450 °C. Simulation results are in good agreement with the experimental data. The error in forecasting the tensile elastic modulus is 5 %, and the tensile strength is 8%. The proposed approach in forecasting physical and mechanical characteristics of the dispersion-hardened composite material made of the Ti-4.25Al-2V titanium alloy with addition of the 1 % SiC ceramic particles could also be of interest in studying the other metal-matrix composite materials manufactured using the direct laser growing technology.
EDN: LDBHWI, https://elibrary/ldbhwi

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