Abstract
A computational and experimental method is proposed to determine the medium model for describing the mechanical properties of powder particles of a high-strength VT-22 titanium alloy obtained by plasma spraying in an inert gas jet. The method is based on the indirect determination of the σs ~ ε strain hardening diagram (yield stress dependence on plastic deformation). A specimen for fullscale tests was prepared as a section of powder particles filled into a special resin. The paper provides the results of Vickers indentation into VT-22 powder particles and the results of computer simulation of this process by the finite element method. The average value of the maximum indentation depth was hmax = 6,56 μm with a maximum loading value of 2 N. The Johnson-Cook elasto-plastic model of a material with nonlinear hardening was used for the volume element considered during the computer simulation. An algorithm for searching coefficients by computational experiment multistage planning was proposed to identify the parameters of the equation sought. Estimated maximum coincidences of experimental and calculated data were chosen as selection criteria, in particular, based on maximum indentation depth. As a result of the study, material model coefficient values that meet search conditions best were chosen from a possible set of such values. According to the algorithm proposed, the result was achieved in 4 calculation cycles. Powder metallographic study was carried out. It was found that particles have a coarse intragranular structure with the dominating b phase formed during plasma spraying. This probably led to a decrease in VT-22 alloy deformation resistance in the powder particles.
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Schedule a callMore From: Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional’nye Pokrytiya (Universitiesʹ Proceedings. Powder Metallurgy аnd Functional Coatings)
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