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Solidification of castings by pouring into shell moulds in vakuum furnaces
Odložil, Jan ; Ňuksa, Petr (referee) ; Roučka, Jaromír (advisor)
Heat transfer during metal pouring and its solidification in the vacuum furnace have been investigated by experiments using model set of castings of different diameters and insulations. The pouring metal was Inconel 713LC alloy based on nickel. The found data have been used for optimization of the numerical simulation of the thermal regime during the both pouring and solidification phases of the process in vacuum. Numerical simulation of the alloy structure in individual castings has been made by the CAFE module of the ProCast software and obtained results compared with the real structure. The optimized boundary conditions can be used for simulation of real castings.
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Optimization of macrostructure of nickel-based alloys castings
Šmíd, Michal ; Ňuksa, Petr (referee) ; Roučka, Jaromír (advisor)
This diploma thesis is focusing on possibilities of influencing casting’s structure of nickel superalloy Inconel 713LC by force effects caused by vibration and rotation during crystallization. In this research were cast three test castings of turbine wheels with different solidification conditions that have affected the size and distribution of the grains. The aim was to compare the different microstructure and macrostructure of castings and then compare the dependence of grain refinement on mechanical properties. Changes in the structure were analyzed by means of light and electron microscopy methods after the fracture of test bars.
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Use of Additive Technology for the Production Concept of Turbocharger Components
Robl, Jan ; Ňuksa, Petr (referee) ; Sedlák, Josef (advisor)
The thesis deals with possible use of additive technology in heat-resistant aplications. The rapid improvement of additive technology in recent years has brought more advanced materials such as nickel based superalloys, opening new oportunities for the use of this additive technology. First part of the thesis is dedicated to nickel based superalloys processing, precision casting and metal additive manufacturing. Other part analysed the results of mechanical properties and textures of the surface followed by a comprehensive assessment of DMLS technology. Part of the thesis is also the analysis of fracture surfaces on transmission and electron microscopy. Based on acquired nowledge, the conclusion is made about the possible use of DMLS in the future of heat-resistant applications.
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Application of Metal Additive Technology in Production of a Blisk for Turbine Engine of a Auxiliary Power Unit
Robl, Jan ; Ňuksa, Petr (referee) ; Sedlák, Josef (advisor)
The thesis deals with the possible use of additive technology in the production of strong thermally exposed components of turbine engines. The first part of the thesis is dedicated to the issue of processing heat-resistant materials by SLM method, introduction of conventional production of selected part and outline of currently used progressive methods in precision casting technology. These theoretical findings are further applied in the practical part of the thesis, which deals with the analysis of mechanical properties of cast and printed material IN 939. Experimental part also includes production of the blisk of the first stage turbine of the auxiliary power unit S5L by SLM additive technology. The thesis also includes analysis of fracture surfaces and metallographic analysis of samples using light and scanning electron microscopy. The thesis ends with the evaluation of the achieved results.
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Application of Metal Additive Technology in Production of a Blisk for Turbine Engine of a Auxiliary Power Unit
Robl, Jan ; Ňuksa, Petr (referee) ; Sedlák, Josef (advisor)
The thesis deals with the possible use of additive technology in the production of strong thermally exposed components of turbine engines. The first part of the thesis is dedicated to the issue of processing heat-resistant materials by SLM method, introduction of conventional production of selected part and outline of currently used progressive methods in precision casting technology. These theoretical findings are further applied in the practical part of the thesis, which deals with the analysis of mechanical properties of cast and printed material IN 939. Experimental part also includes production of the blisk of the first stage turbine of the auxiliary power unit S5L by SLM additive technology. The thesis also includes analysis of fracture surfaces and metallographic analysis of samples using light and scanning electron microscopy. The thesis ends with the evaluation of the achieved results.
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Use of Additive Technology for the Production Concept of Turbocharger Components
Robl, Jan ; Ňuksa, Petr (referee) ; Sedlák, Josef (advisor)
The thesis deals with possible use of additive technology in heat-resistant aplications. The rapid improvement of additive technology in recent years has brought more advanced materials such as nickel based superalloys, opening new oportunities for the use of this additive technology. First part of the thesis is dedicated to nickel based superalloys processing, precision casting and metal additive manufacturing. Other part analysed the results of mechanical properties and textures of the surface followed by a comprehensive assessment of DMLS technology. Part of the thesis is also the analysis of fracture surfaces on transmission and electron microscopy. Based on acquired nowledge, the conclusion is made about the possible use of DMLS in the future of heat-resistant applications.
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