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| Modelovanie fázových diagramov systémov s bórom | |
| Modeling of phase diagrams of systems with boron | |
| Program: | Inter-academic agreement |
| Project leader: | RNDr. Homolová Viera, PhD. |
| Annotation: | The project deals with modelling of phase diagrams of systems containing boron by CALPHAD method. Main aim of the project is the development of reliable database for thermodynamic calculations of phase diagrams of studied systems. The ternary subsystems of Fe-B-Cr-V-C-Mn system are the main subject of the investigation. Known unary and binary data from literature together with results of our experimental program, based on long term annealing at high temperatures and consequent study of samples by electron microscopy, X-ray diffraction (XRD), X-ray analysis (EDX, WDX, EBSD), DTA-DSC, and also available experimental data from the literature will be used for modelling of the systems. Developed database will allow predict phase equilibria in more complex systems and can be used for modelling of diffusion processes. The results of the project will contribute to the knowledge about phase chemical composition, structure and morphology in thermodynamic equilibrium in the mentioned systems. |
| Duration: | 1.1.2015 – 31.12.2017 |
National
| Termodynamické modelovanie ternárneho systému B-Nb-Ta | |
| Thermodynamic modeling of B-Nb-Ta ternary system | |
| Program: | VEGA |
| Project leader: | RNDr. Homolová Viera, PhD. |
| Annotation: | The project focuses on the study of phases, phase equilibria and thermodynamic properties of the ternary B-Nb-Ta system suitable as part of materials for high-temperature and ultra-high-temperature applications in the aerospace industry and in nuclear energy. The aim is to obtain knowledge about the existence of phases, their chemical composition, structure and phase equilibria in a given system using experimental methods of differential thermal analysis, X-ray diffraction and electron microscopy, and subsequently by the semi-empirical methodCalphad to develop a database of thermodynamic parameters and model phase diagram and thermodynamicproperties of the system. The results of the project will allow extending the possibility of designing new materialsfor high-temperature use by computational methods without the need for time-consuming experimental testing. |
| Duration: | 1.1.2024 – 31.12.2026 |
| Výskum odolnosti a prevencie moderných konštrukčných materiálov voči vodíkovému krehnutiu | |
| Research of the resistance and prevention of modern structural materials against hydrogen embrittlement | |
| Program: | VEGA |
| Project leader: | Ing. Falat Ladislav, PhD. |
| Annotation: | The aim of the project is to investigate the susceptibility to hydrogen embrittlement (HE) of structural metallicmaterials based on Fe (i.e. modern grades of carbon and alloy steels) as well as selected alloys or compositesbased on non-ferrous metals (e.g. Al, Cu, Mg, etc.) by the method of electrochemical hydrogen charging andmechanical testing in laboratory conditions. The microstructural conditionality of hydrogen embrittlement will be investigated on defined material states with characteristic microstructural parameters (grain size, phase composition, etc.). The possibilities of HE prevention will be investigated using available methods of surface modification (layers and coatings, surface alloying, formation of gradient structures, etc.) of basic materials inorder to apply a barrier effect against hydrogen permeability. |
| Duration: | 1.1.2022 – 31.12.2025 |
| Modelovanie fázových diagramov a termodynamických vlastnosti systémov pre vysoko teplotné aplikácie | |
| Modelling of phase diagram and thermodynamic properties of the systems for high temperature applications | |
| Program: | VEGA |
| Project leader: | RNDr. Homolová Viera, PhD. |
| Annotation: | The project focuses on the study of phases, phase equilibria and phase diagrams in systems forhigh-temperature applications. The aim is to refine the uncertainty of phase diagrams and investigate unknownparts of selected binary systems by experimental methods of differential thermal analysis, X-ray diffraction andelectron microscopy and then to model their phase diagrams and thermodynamic properties using thesemi-empirical Calphad-method. The subject of the study are binary systems with iridium. Iridium is an elementwhich, due to its thermodynamic properties, is very interesting for use in the aerospace industry and due to itshigh corrosion resistance even at very high temperatures, it may potentially be suitable for use as part of gasturbine materials. The results of the project will allow to extend the possibility of designing new materials forhigh-temperature use by computational methods without the need for time-consuming experimental testing. |
| Duration: | 1.1.2021 – 12.12.2023 |
| Predikcia zvariteľnosti a lisovateľnosti kombinovaných laserom zváraných prístrihov z vysokopevných ocelí s podporou CAE systémov | |
| Prediction of weldability and formability for laser welded tailored blanks made of combined high strength steels with CAE support | |
| Program: | VEGA |
| Project leader: | Ing. Kepič Ján, PhD. |
| Annotation: | The aim of the project is to verify the virtual engineering techniques when design and production of prototypes of molds and dies for the production of thin-walled automotive components from tailored laser welded blanks. Based on the results obtained on physical models of selected thin-walled car components, applied CAD/CAE/CAM techniques will be verified. The core of the project consist of CAE analyses and predictions of laser welds microstructure, weldability and formability of laser welded blanks made of combined steels. Verified methodologies for the weldability and the formability prediction should contribute to include more knowledge and less material when design thin-walled car-body components. Thus, low emissions at car operation is reached, production time shortening and production costs decrease as well. |
| Duration: | 1.1.2019 – 31.12.2022 |
| Prehodnotenie vplyvu intermetalickej fázy na procesy krehnutia žiarupevných ocelí | |
| Re-evaluation of the effect of intermetallic phase on embrittling processes of creep-resistant steels | |
| Program: | VEGA |
| Project leader: | Ing. Falat Ladislav, PhD. |
| Annotation: | The project intention is to investigate the effect of intermetallic Laves phase in thermally exposed 9Cr creep-resistant steels on degradation of their mechanical and brittle-fracture properties. Microstructure evolution aimed at kinetics of precipitation and coarsening of Laves phase will be studied in dependence of the conditionsof initial heat treatment. Apart from comparison of the properties of long-term thermally exposed states (i.e. with presence of Laves phase) with the properties of initial material states without long-term thermal exposition (i.e. without Laves phase), the key task will be the study of the effect of supplemental heat treatment of thermally-exposed states (without notable effect on Laves phase precipitation/coarsening) on potential modification of the properties of creep-resistant steels. The main aim of the project is to re-evaluate and eventually complete up-to now generally accepted opinion on the Laves phase considered as the main embrittling factor in creep-resistant steels. |
| Duration: | 1.1.2019 – 31.12.2021 |
| Termodynamické modelovanie ternárneho systému B-Fe-W a extrapolácia ternárnych dát pre termodynamické výpočty polykomponentných zliatinových systémov | |
| Thermodynamic modelling of the B-Fe-W ternary system and extrapolation of ternary data for thermodynamic calculations of poly-component alloy systems | |
| Program: | VEGA |
| Project leader: | RNDr. Homolová Viera, PhD. |
| Annotation: | The project links to the previous projects dealing with modelling of Fe-B-X (X= V, Cr, C, Mn) ternary systems. It is focused on the study of the phases and phase equilibria in B-Fe-W ternary system. The research results will contribute to the knowledge on the phases existence, their chemical composition, structure and equilibria in thementioned system. The main goal of the project is a creation of reliable parameter database for thermodynamic calculations in B-Fe-W ternary system by Calphad method. This database will contribute to the creation of complex thermodynamic parameter database allowing predictions of phase equilibria for wide range of systems. In the scope of the project, also poly-component alloy systems, mainly creep-resistant steels with boron, will be investigated. The investigation will be focused on phase existence and phase equilibria. For the poly-component materials, phase diagrams will be calculated using the newly-developed thermodynamic databases for ternary systems with boron. |
| Duration: | 1.1.2018 – 31.12.2020 |
| AMEMAT – Rozvoj poznatkovej bázy v oblasti pokročilých kovových materiálov s využitím moderných teoretických, experimentálnych a technologických postupov | |
| Advancement of knowledge in area of advanced metallic materials by use of up-to-date theoretical, experimental, and technological procedures | |
| Program: | SRDA |
| Project leader: | RNDr. Homolová Viera, PhD. |
| Annotation: | The project is focused on the acceleration of progress in gaining knowledge about advanced metallic materials. In the related research the representative part of the Slovak scientific basis will be involved, namely the SlovakUniversity of Technology (STU) in Bratislava, the Institute of Physics (IP) of the Slovak Academy of Sciences (SAS), and the Institute of Materials Research (IMR) of SAS. To fulfil project tasks, the top-level recently provided equipment will be used, available at the university scientific parks of STU located in Bratislava and Trnava as well as at the scientific centres of SAS located in Bratislava (IP) and Košice (IMR). The experimental research will be combined with calculations from first principles (IP SAS) and thermodynamic predictions (IMR SAS), both the procedures, which the involved researchers reached a world-wide acceptance in. From thethematic point of view, the project implies theoretic and experimental studies of advanced metallic materials mainly related to phase equilibria (new phase diagrams will be proposed and the existing will be refined on),characterization of crystal structures of un- and less-known complex phases, electrochemical and catalytic properties of surfaces, and innovations in production of thin layers, coatings, and ribbons. Expected results will be published in stages in relevant scientific journals, used by the involved researchers in educational process,and consulted eventually with industrial partners to consider the transfer of technological findings in praxis. All the involved institutions have a huge experience with the science promotion and are ready to exert it in the project. |
| Duration: | 1.7.2016 – 30.6.2020 |
| Vplyv mikroštruktúry TOO v modifikovaných 9Cr oceliach na porušovanie | |
| Influence of the HAZ microstructure on degradation of modified 9Cr steels | |
| Program: | VEGA |
| Project leader: | RNDr. Ševc Peter, PhD. |
| Annotation: | The project is focused on the study of the processes operating on the microstructure and substructure levels in modified 9Cr steels and their influence on the failure of the material. Its intention is to investigate the interconnections among the microstructure, substructure, secondary phase precipitation and hydrogen environment influence in the individual parts of the weld HAZ during degradation processes. The research results could be used at the degradation evaluation of the experimental materials and their welds in connection with the research group former projects results performed on the real weld joints from the view of their sensitivity to the failure during the thermal and mechanical straining. |
| Duration: | 1.1.2016 – 31.12.2018 |
| Vplyv parametrov laserového zvárania na štruktúru a vlastnosti zvarových spojov moderných ocelí pre automobilový priemysel | |
| Influence of laser welding parameters on microstructure and properties of welded joints of advanced steels for automotive industry | |
| Program: | VEGA |
| Project leader: | Ing. Kepič Ján, PhD. |
| Annotation: | The project is focused on prediction of laser welded joint behaviour at different strain rates. Mentioned simulatedthe real crash tests by creating new and cost-efficient test methods available in the laboratory. The strength anddeformation properties of high-strength steel sheets, laser welded tailored blanks and composites will beinvestigated by tensile, 3-point bending and cyclic bending tests. The measured characteristics of these materialswill be compared with the characteristics of progressive materials such as aluminium alloys and composites. Thethermodynamic calculations will be performed before welding in order to predict phase composition ofpolycomponent welds depending on welding conditions (power, welding rate and focus position). To reach theobjectives the method of design of experiment, experimental tests and numerical simulations based on finiteelements metod will be used. |
| Duration: | 1.1.2016 – 31.12.2018 |
| Termodynamická analýza a modelovanie fázového diagramu ternárneho systému Fe-B-Mn a verifikácia databázy pre termodynamické výpočty komplexných systémov experimentálnou analýzou zliatin typu Fe-B-X-Y (X, Y=V, Cr, C, Mn). | |
| Thermodynamic analysis and modelling of phase diagram for Fe-B-Mn ternary system and verification database for thermodynamic calculations of complex systems by experimental analysis of Fe-B-X-Y (X,Y=V, Cr, C, Mn) alloys. | |
| Program: | VEGA |
| Project leader: | RNDr. Homolová Viera, PhD. |
| Annotation: | The project links to the previous projects dealing with modelling of Fe-B-X (X= V, Cr, C) ternary systems. It is focused on the study of the phases and phase eqiulibria in Fe-B-Mn ternary system. The research results contribute to the knowledge on phases existence, their chemical composition, structure and eqiulibria in the mentioned system. The main goal of the project is creation reliable parameter database for thermodynamic calculations in Fe-B-Mn ternary system by Calphad method. This database contributes to the creation of complex thermodynamic parameter database allowing more exact phase equilibria predictions for wide range of systems.Another task of the project is the experimental investigation of quaternary alloys of the Fe-B-X-Y (X, Y=V, Cr, C, Mn) type which will be used for the verification of our complex database. The complex database will be createdby merging of the databases of the Fe-B-Mn system, Fe-B-X (X= V, Cr, C) ternary systems and other existing databases. |
| Duration: | 1.1.2015 – 31.12.2017 |
| Modifikácia štruktúr teplom-ovplyvnenej oblasti zvarových spojov moderných 9Cr feritických žiarupevných ocelí s bórom za účelom zlepšenia ich creepovej odolnosti a húževnatosti | |
| Modification of the heat-affected zone microstructures of welded joints of advanced 9Cr ferritic creep-resistant steels with boron for the purpose of their creep-resistance and toughness improvement | |
| Program: | VEGA |
| Project leader: | Ing. Falat Ladislav, PhD. |
| Annotation: | Ferritic 9Cr creep-resistant steels are used in energy industry for the construction of highly efficient supercritical boilers. The problems during creep of welded joints of these steels include degradation of their properties and premature type IV failure in heat-affected zone (HAZ). The most recent research results worldwide indicate the possibility of solution of mentioned problems by boron alloying which effect is not completely understood. The aim of present project is to study the boron effect in base materials and the influence of post-weld heat treatment on the HAZ microstructures and properties modification. Different HAZ microstructural states will be prepared by simulation heat treatment and thermophysical simulation of base materials. The individual material states will be characterised with respect to their microstructure and phase stability supported by thermodynamic modelling using Calphad method and also with regard to their mechanical properties and creep resistance. |
| Duration: | 1.1.2013 – 31.12.2015 |
| Termodynamický opis systémov B-Cr a Fe-B-Cr | |
| Thermodynamic description of B-Cr and Fe-B-Cr systems | |
| Program: | VEGA |
| Project leader: | RNDr. Homolová Viera, PhD. |
| Annotation: | The project connects with the project:"Thermodynamic analysis of binary and ternary systems with boron" and deals with study of phases and phase equlibria in Fe-B-Cr system and in B-Cr subsystem. Main goal of the project is the development of reliable database of parameters for thermodynamic calculations for Fe-B-Cr ternary system and the extension of knowledge on the existence of chromium borides, their chemical composition, structures and phase equilibria in the investigated systems. This system is one of subsystems of complex steels containing boron, including white iron, austenitic stainless steels, hard layers, number of soft magnetic alloys etc. The new-created database contributes to the development and reassessment of extensive database of thermodynamic parameters for prediction of phase equilibria for wide range of systems. Achieved data alow the application of thermodynamic and kinetic modelling at the study and development of new materials, as well. |
| Duration: | 1.1.2012 – 31.12.2014 |
| Degradácia a porušovanie heterogénnych zvarových spojov P92/316H s prídavným materiálom na báze Ni | |
| Degradation and filure of dissimilar weld joints P92/312H with Ni-based filler metal | |
| Program: | VEGA |
| Project leader: | Ing. Výrostková Anna, CSc. |
| Annotation: | Description of microstructure degradation and failure mechanism of dissimilar weld joints ferrite/Ni-base filler metal/austenite in creep conditions after two kinds of PWHT. Detailed study of interfacial localities. Thermodynamic and kinetic modelling of the microstructure evolution. |
| Duration: | 1.1.2010 – 31.12.2012 |
| Technológia prípravy elektrotechnických ocelí s vysokou permeabilitou určených pre elektromotory s vyššou účinnosťou | |
| Technology of preparation of electrotechnical steels possessing high permeability for high affectivity electromotors. | |
| Program: | EU Structural Funds Research & Development |
| Project leader: | RNDr. Kováč František, CSc. |
| Annotation: | The project is focused on oriented research and development of progressive electrotechnical steel possessing goal-directed microstructures, textures and substructures parameters that provide excellent application properties. The application is aimed on high efficient electrical gears used in electrotechnical, energetic and automobile industry areas. This bears a great importance not only on Slovak Republic but in whole Europe Union scale. Within connection with knowledge transfer to economic area, an increase of produced product quality is expected. The quality improvement could be achieved at recent or even lower production costs that will lead to increasing of product competitiveness. |
| Duration: | 1.1.2010 – 30.6.2012 |
| Termodynamický opis systémov B-C a Fe-B-C | |
| Thermodynamic description of the B-C and Fe-B-C systems | |
| Program: | VEGA |
| Project leader: | RNDr. Homolová Viera, PhD. |
| Annotation: | The project knots on project: ” Thermodynamic analysis of binary and ternary systems with boron”, and deals with study of phase and phase equilibria in the Fe-B-C system and in B-C subsystem. It contributes to the extension of knowledge about existence of stable and metastable phases (borides, borcarbides, carbides of boron), their chemical compositions, structures and phase equilibria in the investigated systems. The main goal of the project is development of reliable database of parameters for thermodynamic calculations for Fe-B-C ternary system, which is subsystem of all steel containing of boron and also subsystem of some amorphous magnetic materials. The new-created database contributes to the development of extensive database of thermodynamic parameters for prediction of phase equilibria for wide range of systems. Acquired data will have wide application for thermodynamic and kinetic modelling at the study and development of new materials. |
| Duration: | 1.1.2009 – 31.12.2011 |
| Vplyv parametrov žíhania na mikroštruktúru a vlastnosti heterogénnych zvarových spojov a ohybov progresívnych ocelí | |
| Influence of annealing parameters on the microstructure and heterogene ous weld joints and bends of progressive streels | |
| Program: | VEGA |
| Project leader: | Ing. Výrostková Anna, CSc. |
| Annotation: | The project deals with the influence of the cold deformation and annealing of bends on precipitation processes in new, advanced martesitic steels of P92 and E911 grades and in heterogeneous weld joints P92, E911 – TP 347 H (stabilized austenitic steel). The steels and welds have been planned for the construction of USCB-ultra-super-critical-boilers. Joints will be prepared at various technology conditions (weld metal, heat input) with two approaches of the post weld heat treatment (PWHT), namely: austenitization+tempering and tempering without austenitization. On the base of the microstructural evaluation, calculations of residual stresses, and results of mechanical tests (hardness, tensile tests at 20 adn 600°C, short trem crep test) the possibility of the omission of austenitization will be judged, that could result in decisive economical effect – energy savings and avoiding using of a large furnace for the treatmet at the temperatures above 1000°C. Experimental assesment of phase composition and thermodynamic calculations of equilibrium phases enable the investigated steels phase evolution diagrams constuction. The study of the influence of deformation on precipitation of phases in tube bends in relationship with the heat treatment used and resulted property changes is the second scope of the project, aimed to the HT optimization. |
| Duration: | 1.1.2007 – 31.12.2009 |
| APVV99-045105 – Zvariteľnosť žiarupevných ocelí novej generácieí pre energetické celky s vyššou účinnosťou | |
| Weldability of new generation creep steels for high efficiency power plant units | |
| Program: | SRDA |
| Project leader: | Ing. Výrostková Anna, CSc. |
| Annotation: | The project is focussed on the study of new creep strength steels weldability and possibilities of their application. It is devided in three tasks (ČÚ). The first one is devoted to the question of weldability and welding of new creep strength steels, the second deals with the study of residual stresses evolution during the production and repair of energy components. The last task deals with the mechanisms of cracking of the weld joints of the new generation. The result of ČÚ 1 will be a proposal of suitable heterogeneous weld combinations to be used in innovated energy units. ČÚ 2 will lead to the suggestion of the welding technology and selection of filler metals ensuring minimal level of residual stresses during the production and repair of energy units, respectivelly. The mechanism of cracks originating in weld joints in the service at supercritical conditions will be a result of the ČÚ 3. |
| Duration: | 1.5.2006 – 30.9.2009 |
| AMOD – Analyticko-počítačová metóda predikcie životnosti viacfázových materiálov | |
| Analytical-computational method of lifetime prediction for multiphase materials | |
| Program: | SRDA |
| Project leader: | Ing. Mgr. Ceniga Ladislav, DrSc. |
| Duration: | 1.1.2007 – 31.3.2009 |
| Termodynamická analýza binárnych a ternárnych systémov s bórom | |
| Thermodynamic analysis of binary and ternary systems with boron | |
| Program: | VEGA |
| Project leader: | RNDr. Homolová Viera, PhD. |
| Annotation: | The scientific project is oriented to extension of knowledge about influence of boron on formation and development of phases. The using of boron as an alloying element in alloys for different proposes has had an increasing tendency. In the proposed project the systems B-V and Fe-B-V will be studied, in which vanadium as a strong boride-forming element forms stabile borides with high melting temperatures, high hardness, and wear resistance. Main aim of the project is to develop the set of thermodynamic data on the base the experimental and theoretical study of phase and phase equilibria, allowing to calculate phase equilibria and phase diagrams for the investigated systems. It contributes to the development of extensive database of thermodynamic data for prediction of phase equilibria for wide range of systems. Acquired data will have wide application for thermodynamic and kinetic modelling at the study and development of materials. |
| Duration: | 1.1.2006 – 31.12.2008 |