Ing. Kateřina Mouralová, Ph.D.
E-mail:   mouralova@fme.vutbr.cz  Dept.:   Institute of Automation and Computer Science Dept. of Automation Position:   Assistant Professor Room:   B2/411

Publications:

• MOURALOVÁ, K.; PROKEŠ, T.; BENEŠ, L.; SLIWKOVÁ, P.:
  Analysis of subsurface defects occurrence in abrasion resistant Creusabro steel after WEDM including the study of morphology and surface topography, Taylor & Francis Group
  journal article in Web of Science
• MOURALOVÁ, K.; ZAHRADNÍČEK, R.; BEDNÁŘ, J.:
  Study of vertical graphene growth on silver substrate based on design of experiment
  journal article in Web of Science
• MOURALOVÁ, K.; BENEŠ, L.; BEDNÁŘ, J.; ZAHRADNÍČEK, R.; PROKEŠ, T.; MATOUŠEK, R.; HRABEC, P.; FIŠEROVÁ, Z.; OTOUPALÍK, J.:
  Using a Design of Experiment for a Comprehensive Analysis of the Surface Quality and Cutting Speed in WED-Machined Hadfield Steel, Springer
  journal article in Web of Science
• MOURALOVÁ, K.; BENEŠ, L.; PROKEŠ, T.; ZAHRADNÍČEK, R.; BEDNÁŘ, J.; OTOUPALÍK, J.; FIŠEROVÁ, Z.; FIALA, Z.:
  Micro-milling machinability of pure molybdenum, Springer
  journal article in Web of Science
• MOURALOVÁ, K.; PROKEŠ, T.; BENEŠ, L.:
  Surface and subsurface layers defects analysis after WEDM affecting the subsequent lifetime of produced components, Springer
  journal article in Web of Science
• MOURALOVÁ, K.; BENEŠ, L.; ZAHRADNÍČEK, R.; BEDNÁŘ, J.; HRABEC, P.; PROKEŠ, T.; HRDÝ, R.:
  Analysis of cut orientation through half-finished product using WEDM, Taylor & Francis
  journal article in Web of Science
• MOURALOVÁ, K.; KLAKURKOVÁ, L.; MATOUŠEK, R.; PROKEŠ, T.; HRDÝ, R.; KAŇA, V.:
  Influence of the Cut Direction through the Semi-Finished Product on the Occurrence of Cracks for X210Cr12 Steel Using WEDM, Elsevier
  journal article in Web of Science
• MOURALOVÁ, K.; BENEŠ, L.; ZAHRADNÍČEK, R.; BEDNÁŘ, J.; HRABEC, P.; PROKEŠ, T.; MATOUŠEK, R.; FIALA, Z.:
  Quality of Surface and Subsurface Layers after WEDM Aluminum Alloy 7475-T7351 Including Analysis of TEM Lamella, Springer
  journal article in Web of Science
• MOURALOVÁ, K.; KOVÁŘ, J.; KLAKURKOVÁ, L.; PROKEŠ, T.:
  Effect of width of kerf on machining accuracy and subsurface layer after WEDM, ASM International
  journal article in Web of Science
• MOURALOVÁ, K.; KOVÁŘ, J.; KLAKURKOVÁ, L.; BLAŽÍK, P.; KALIVODA, M.; KOUSAL, P.:
  Analysis of surface and subsurface layers after WEDM for Ti-6Al-4V with heat treatment
  journal article in Web of Science
• MOURALOVÁ, K.; KOVÁŘ, J.; KLAKURKOVÁ, L.; BEDNÁŘ, J.; BENEŠ, L.; ZAHRADNÍČEK, R.:
  Analysis of the surface morphology and topography of pure aluminium machined using WEDM
  journal article in Web of Science
• MOURALOVÁ, K.; KOVÁŘ, J.; KLAKURKOVÁ, L.; PROKEŠ, T.; HORYNOVÁ, M.:
  Comparison of morphology and topography of surfaces of WEDM machined structural materials
  journal article in Web of Science
• MOURALOVÁ, K.; MATOUŠEK, R.; KOVÁŘ, J.; MACH, J.; KLAKURKOVÁ, L.; BEDNÁŘ, J.:
  Analyzing the surface layer after WEDM depending on the parameters of a machine for the 16MnCr5 steel
  journal article in Web of Science
• MOURALOVÁ, K.; KOVÁŘ, J.; HOUŠKA, P.:
  Experimental evaluation of WEDM machined surface waviness, Czech Technical University in Prague
  journal article in Web of Science

List of publications at Portal BUT

Abstracts of most important papers:

• MOURALOVÁ, K.; PROKEŠ, T.; BENEŠ, L.; SLIWKOVÁ, P.:
  Analysis of subsurface defects occurrence in abrasion resistant Creusabro steel after WEDM including the study of morphology and surface topography, Taylor & Francis Group
  journal article in Web of Science
  Unconventional wire electrical discharge machining technology (WEDM) is an indispensable part of the production of many industrial devices. Material separation takes place at very high local temperatures, and therefore some undesirable surface and sub-surface defects are formed. Not only the occurrence of defects but also the quality of the machined surface is very important for the end customer, so it is necessary to monitor it carefully. For this reason, a 33-round planned experiment was carried out for the study of the impact of the machine parameters setup (gap voltage, pulse on time, pulse off time, discharge current, wire speed) on the topography and morphology of the abrasion resistant steel Creusabro 4800. Metallographic preparations of all samples that allowed the study of subsurface defects using light and electron microscopy were produced. In order to investigate changes in the chemical composition of the surface and subsurface layers of the effects of WEDM machining a complex chemical composition analysis (EDX) was performed. A significant effect of the machine parameters setup on the occurrence of subsurface defects was demonstrated and the presence of burned cavities could be completely eliminated with machine parameters setup: gap voltage=60 V, pulse on time=8 μs, pulse off time=40 μs, wire speed=12 m•min-1 and discharge current=25 A.
• MOURALOVÁ, K.; BENEŠ, L.; BEDNÁŘ, J.; ZAHRADNÍČEK, R.; PROKEŠ, T.; MATOUŠEK, R.; HRABEC, P.; FIŠEROVÁ, Z.; OTOUPALÍK, J.:
  Using a Design of Experiment for a Comprehensive Analysis of the Surface Quality and Cutting Speed in WED-Machined Hadfield Steel, Springer
  journal article in Web of Science
  Wire Electrical Discharge Machining (WEDM) is an unconventional machining method used to manufacture complex-shaped, precise components. Considering the high-energy intensity of the wire erosion process, its effective implementation requires a maximum cutting speed while still ensuring the best possible quality of the machined surface. For this latter purpose, we conducted a design of experiment (DoE) comprising 33 cycles and five input factors, or machine setting parameters: gap voltage, pulse on time, pulse off time, discharge current, and wire feed. In this context, the present paper statistically evaluates the cutting speed in Hadfield steel, as related to machine setting parameters, and it also analyzes the machined surfaces of the applied samples. The actual experiment involved examining in detail the topography of the surfaces, using one contact and three non-contact profilers. The surface morphologies were observed via electron microscopy, and a lamella was prepared to facilitate the chemical composition analysis (EDX) with a transmission electron microscope (TEM). To study the subsurface layer and its defects, we produced metallographic specimens of all the samples; the observation of the items was performed by means of light and electron microscopes. With a maximum cutting speed the highest quality of the machined surface was achieved; however, the burned cavities can affect the life expectancy of the machined parts. The TEM lamella revealed that the individual alloying elements had segregated into regions, exhibiting high volumes of both manganese and the recast layer and, due to the use of WEDM, a manganese separation layer had formed at the boundary of the recast layer and the base material.
• MOURALOVÁ, K.; BENEŠ, L.; PROKEŠ, T.; ZAHRADNÍČEK, R.; BEDNÁŘ, J.; OTOUPALÍK, J.; FIŠEROVÁ, Z.; FIALA, Z.:
  Micro-milling machinability of pure molybdenum, Springer
  journal article in Web of Science
  As a result of the miniaturization of machined shapes, the conventional micro-milling technology has been widely used in many industrial areas. However, the machining of some types of materials proved to be very difficult. One of the hard-to-machine materials is also pure molybdenum, which, thanks to its high melting temperature, is used, besides others, in the energy industry and for physical applications. To ensure proper functionality of the manufactured parts, it is essential that they are machined without defects and with the required surface quality. The aim of this study was to find an optimal tool with a diameter of 0.8 mm and to set the machine parameters for machining of pure molybdenum with the highest quality of the surface layer possible without any defects. For this purpose, 26-round design of experiment (DoE) was carried out, in which the parameters, like cutting speed, feed and coating (yes/no) were systematically changed. The machined samples were evaluated for topography using a 3D profilometer, their morphology and burrs were studied using an electron microscope, and the microscopic implications on the microstructure of the subsurface layer were studied on the produced lamellae using transmission electron microscope (TEM). In addition, the tool wear curve was examined and evaluated. In this study, an optimal setup of machining parameters for pure molybdenum machining (cutting speed = 80 m/min, feed = 0.002 mm/tooth, non-coated tool) was found with which high-quality and defect-free surfaces can be machined.
• MOURALOVÁ, K.; PROKEŠ, T.; BENEŠ, L.:
  Surface and subsurface layers defects analysis after WEDM affecting the subsequent lifetime of produced components, Springer
  journal article in Web of Science
  Wire electrical discharge machining (WEDM) is an on-traditional technology of machining, which is used in many industries. This technology of utilizing electrical impulses to cut material at high temperatures tends to create many types of surface and subsurface defects on machined surfaces. The occurrence of defects in the form of cracks or burned cavities may represent a significant limitation of the functionality and lifetime of the component. For this reason, the analysis of the occurrence and formation of surface and subsurface defects was carried out in this study, depending on the type of material used and the parameters setup of the machine. The object of the study was 3 metallic and 3 non-metallic materials, 3 samples of which were produced with different parameters setting of the machine. The processed samples were analysed using both light and electron microscopy, and their cross sections as well. In addition, the topography of all samples was evaluated using a contactless profile meter, and the visualization of the 3D surface of the sample was performed using the semi contact atomic force microscope technique. On the basis of the analyses performed, materials have been found in which the occurrence of defects is influenced by the parameters setup and they can, therefore, be prevented.
• MOURALOVÁ, K.; BENEŠ, L.; ZAHRADNÍČEK, R.; BEDNÁŘ, J.; HRABEC, P.; PROKEŠ, T.; HRDÝ, R.:
  Analysis of cut orientation through half-finished product using WEDM, Taylor & Francis
  journal article in Web of Science
  Wire electrical discharge machining (WEDM) is anon-traditional technology utilized to manufacture parts of complex shapes or machining the materials conventionally difficult to process. It is also applied in the aerospace industry, where Inconel 625, which was the subject of the research in this study based on a DoE, is usually machined. In this way the experiment contained 33 rounds during which the settings of machined parameters were changed systematically. An identical experiment (33 rounds) was performed in which the semi-finished product was rotated by 90 ° to define the impact of the orientation direction of the cut on the speed of cutting and the quality of the surface and subsurface layers. Subsequently, a complex analysis of the machined surfaces of the individual samples was performed, including both the surface and subsurface layers. Topography was evaluated using a non-contact profilometer, including the creation of a colour-filtered 3D surface relief. The subject of further investigation was the analysis of morphology and surface defects including the chemical composition analysis (EDX). For a very detailed observation of the distribution of the individual elements in the material, lamella was prepared, which was subsequently studied using a Transmission Electron Microscope (TEM). For the subsurface layer study and its defects, metallographic preparations of all samples, which were observed using both light and electron microscopy, were prepared. On the basis of the analyses performed, the impact of the cutting direction on the cutting speed as well as the machined surface quality was determined.