2022
Quantitative Estimation of Formation of Shrinkage Porosity by the Niyama Criterion
2020
Development of Promising Technology for Manufacturing Parts of Gas Turbine Engines
2017
Mechanism of Competitive Grain Growth in a Curvilinear Channel of Crystal-Sorter during the Orientational Solidification of Nickel-Based Heat-Resistant Alloy
Source: Physics of Metals and Metallography, 2017, Vol. 118, No. 7, pp. 652–658. © Pleiades Publishing, Ltd., 2017.
Abstract: Using numerical simulation in the ProCAST program complex, the conditions of the solidification of heat-resistant nickel alloy in curvilinear channels of a ceramic mold have been investigated. It has been shown that, in practically important cases, the vector of the temperature gradient is oriented along the axis of the curvilinear channel. In a spiral crystal selector, a cyclic change in the preferred direction of growth occurs because of the cyclic change in the direction of the vector of the temperature gradient. The fact that the vector of the temperature gradient is almost always directed along the axis of the curvilinear channel makes it possible to govern the orientation of the vector of the temperature gradient in space and, therefore, to obtain a grain with the preferred crystallographic orientation. Based on the results of this investigation, a method of the grain selection with a desired azimuthal orientation is proposed.
2016
Production of Railcar Cast Wheels in Sand Molds
2015
Computer Modelling of Castings Quality with Taking Into Account the Differentiation of Structure-Dependent Cores and Molds Material Properties
Simulation of Competitive Grain Growth upon the Directional Solidification of a Ni-Base Superalloy
Source: The Physics of Metals and Metallography, 2015, Vol. 116, No. 1, pp. 63–71. © Pleiades Publishing, Ltd., 2015.
Abstract: Using the numerical simulation in the CA[1]FE module of the ProCAST simulation program, a systematic investigation of competitive growth of grains in a thin plate has been performed over a wide range of values of the temperature gradient and solidification rate. It has been established that the result of the simulation in the case of converging grains depends on the only parameter, i.e., the ratio of the value of the overgrowth of the grain with the preferred orientation to the size of the cell of the computational grid. Thus, the size of the cell is an important adjusting parameter of the model and must be coordinated with the parameters of the dendritic structure under given growth conditions. The grain with the preferred orientation always displaces neighboring diverging grains. The converging grains are eliminated if their deviation from the vector of the temperature gradient exceeds 20°. At the smaller angles of deviation, the result of the competitive growth depends on the size of the computational cell and varies from their joint growth (at the cell size of 5 μm) to the displacement of grains with the preferred orientation (at the cell size of 20 μm). However, all of the results of the simulation agree with the experimental data available in the literature. For the efficient selection of grains with the preferred orientation, regimes with a low temperature gradient and high growth rate are favorable.
2011
Computer modelling of casting processes for heavy steel ingots
2007
Using of the casting simulation system “PoligonSoft” for analysis of a temperature field of aluminum alloys.
Authors: J.Bast, Y.Kotova
A source: Freiberger Forschungshefte A 892, ISBN 978-3-86012-319-5 (2007), p. 107 – 113.
Annotation: Today a great number of modeling systems in mechanical engineering are being used, the gain of their using is obvious in comparison with experiments. One of these systems is a simulation system “PoligonSoft”. This system allows improving some of the most important process variables not using of real casting, but using of computer modeling.
Computer modelling of casting processes for heavy steel ingots