doc. Ing. Libor Pantělejev, Ph.D.

E-mail:   pantelejev@fme.vutbr.cz  Dept.:   Institute of Materials Science and Engineering Position:   Director of Institute Room:   A3/414 Dept.:   Institute of Materials Science and Engineering Dept. of Mechanics and Design of Materials Position:   Deputy Head Dept.:   Institute of Materials Science and Engineering Dept. of Mechanics and Design of Materials Position:   Associate Professor Room:   A3/414 Dept.:   NeTME Centre NCC MESTEC - Advanced Materials Division Position:   Head of Subdivision Dept.:   NeTME Centre NCC NaCCAS - Advanced Materials Division Position:   Head of Subdivision

Supervised courses:

• Analysis of Machine-part Failures (GA0)
• Analysis of Machine-part Failures (GA0-K)
• Degradation of Materials and Service Life Prediction (WDM)
• Degradation Processes in Engineering Materials (EDE)
• Deposition and Additive Technologies (9DAT)
• Diploma Project (M-MTI) (WD5)
• Engineering Materials and Heat Treatment (HMT)
• Engineering Materials and Heat Treatment (HMT-K)
• Fractography (WFR)
• Fractography and Micromechanisms of Failures (9FMP)
• Materials and Processes for Production (YMV)
• Testing of Materials and Structures (WZM)

Publications:

• PANTĚLEJEV, L.; ŠTĚPÁNEK, R.; MAN, O.:
  Thermal stability of bimodal microstructure in magnesium alloy AZ91 processed by ECAP, Elsevier
  journal article in Web of Science
• FINTOVÁ, S.; PANTĚLEJEV, L.; KUNZ, L.:
  Microstructure and mechanical properties of ultrafine-grained magnesium AZ91 alloy,
  Metallography XV, pp.384-389, ISBN 9783038350729, (2014), Thomas Wohlbier, TTP USA
  conference paper
  akce: 15th International Symposium on Metallography , Stará Lesná, 24.04.2013-26.04.2013
• KUNZ, L.; LUKÁŠ, P.; PANTĚLEJEV, L.; MAN, O.:
  Stability of Microstructure of Ultrafine-Grained Copper Under Fatigue and Thermal Exposition,
  STRAIN, Vol.47, (2011), No.6, pp.476-482, ISSN 0039-2103, Blackwell Publishing Ltd
  journal article - other
• PANTĚLEJEV, L.; MAN, O.; KUNZ, L.:
  Microstructural stability of ultrafine grained copper at elevated temperature,
  Acta Metallurgica Slovaca, Vol.17, (2011), No.3, pp.158-162, ISSN 1335-1532, Technická universita Košice
  journal article - other
• KUNZ, L.; LUKÁŠ, P.; PANTĚLEJEV, L.; MAN, O.:
  Stability of ultrafine-grained structure of copper under fatigue loading,
  Procedia Engineering, Vol.10, (2011), No.ICM11, pp.201-206, ISSN 1877-7058, ELSEVIER
  journal article - other
• MIKMEKOVÁ, Š.; HOVORKA, M.; MÜLLEROVÁ, I.; MAN, O.; PANTĚLEJEV, L.; FRANK, L.:
  Grain Contrast Imaging in UHV SLEEM,
  MATERIALS TRANSACTIONS, Vol.51, (2010), No.2, pp.292-296, ISSN 1345-9678, The Japan Institute of Metals
  journal article - other
• MAN, O.; PANTĚLEJEV, L.; KUNZ, L.:
  Study of Thermal stability of Ultrafine-grained Copper by means of Electron Back Scattering Diffraction,
  MATERIALS TRANSACTIONS, Vol.51, (2010), No.2, pp.209-213, ISSN 1345-9678, The Japan Institute of Metals
  journal article - other

List of publications at Portal BUT

Abstracts of most important papers:

• SUCHÝ, J.; PANTĚLEJEV, L.; PALOUŠEK, D.; KOUTNÝ, D.; KAISER, J.:
  Processing of AlSi9Cu3 alloy by selective laser melting, Taylor & Francis
  journal article in Web of Science
  Additive manufacturing of Al-alloys allows the production of components with a complicated structured shape, geometry composed by lattice structures, internal cooling, etc. The portfolio of Al-alloys for metal additive manufacturing is still under development and is strongly limited, compared to the conventional technology. The alloy AlSi9Cu3 is used in many applications, but its processing details are still missing. The main aim of this paper is to describe the laser process parameters for AlSi9Cu3, processed by SLM technology and manufactured from two powders of different shapes and particle sizes. The tested process parameters were laser power, laser speed, and hatch distance in the range of 100–400 W, 200–1500 mm · s−1 and 90–150 µm. These were tested using a single-track and cube test. Microstructure, mechanical properties and the fatigue of SLM samples were analysed and compared with as-casted material.
• PANTĚLEJEV, L.; ŠTĚPÁNEK, R.; MAN, O.:
  Thermal stability of bimodal microstructure in magnesium alloy AZ91 processed by ECAP, Elsevier
  journal article in Web of Science
  The changes in microstructure of equal channel angular pressing (ECAP) processed magnesium alloy AZ91 during thermal exposure were studied in this paper. The microstructure stability was investigated by means of electron backscatter diffraction (EBSD), which allowed measuring the changes in grain size, mutual ratio of low-angle boundaries (LABs) to high-angle ones (HABs) and local lattice distortion evaluated by the kernel average misorientation (KAM) parameter. It was found experimentally that the threshold temperature at which significant grain coarsening takes place is 350 centigrade. No modification to mean grain diameter occur below this temperature, nonetheless, some changes in LAB and HAB fraction, as well as in local lattice distortion, can be observed.
• FINTOVÁ, S.; PANTĚLEJEV, L.; KUNZ, L.:
  Microstructure and mechanical properties of ultrafine-grained magnesium AZ91 alloy,
  Metallography XV, pp.384-389, ISBN 9783038350729, (2014), Thomas Wohlbier, TTP USA
  conference paper
  akce: 15th International Symposium on Metallography , Stará Lesná, 24.04.2013-26.04.2013
  Microstructure, mechanical properties, cyclic plastic deformation behavior and fatigue strength of ultrafine-grained (UFG) magnesium alloy AZ91 processed by equal channel angular pressing (ECAP) were investigated. ECAP of originally cast alloy results in development of bimodal structure, improved yield stress, tensile strength and ductility when compared to the as-cast state. Endurance limit based on 107 cycles is also improved, however exhibits large scatter. Initiation of fatigue cracks takes place in regions of large grains in the bimodal structure, where the content of Mg17Al12 particles is low.
• KUNZ, L.; LUKÁŠ, P.; PANTĚLEJEV, L.; MAN, O.:
  Stability of Microstructure of Ultrafine-Grained Copper Under Fatigue and Thermal Exposition,
  STRAIN, Vol.47, (2011), No.6, pp.476-482, ISSN 0039-2103, Blackwell Publishing Ltd
  journal article - other
  Effect of cyclic loading and thermal exposition on microstructure of bulk ultrafinegrained Cu prepared by equal channel angular pressing was experimentally investigated by means of electron backscattering diffraction and by transmission electron microscopy. Stability of the microstructure under stress-controlled cyclic loading with a tensile mean stress of 200 MPa was shown to be high. Neither dynamic grain coarsening nor development of bimodal microstructure was observed. However, annealing at 250 C for 30 min resulted in formation of bimodal microstructure. Consequently, fatigue strength of annealed specimens was low.
• KUNZ, L.; LUKÁŠ, P.; PANTĚLEJEV, L.; MAN, O.:
  Stability of ultrafine-grained structure of copper under fatigue loading,
  Procedia Engineering, Vol.10, (2011), No.ICM11, pp.201-206, ISSN 1877-7058, ELSEVIER
  journal article - other
  Stability of microstructure of ultrafine-grained materials under cyclic loading is a crucial condition for their good fatigue performance. Changes of microstructure due to fatigue in bulk, localization of cyclic plasticity into cyclic slip bands and related development of microstructure were experimentally studied on ultrafine-grained copper prepared by equal channel angular pressing. Different reaction of ultrafine-grained structure to plastic strain-controlled and load-controlled tests was found. The different susceptibility to dynamic grain coarsening under load and plastic strain-controlled tests reported in literature cannot be explained by differences in purity or details of equal channel angular pressing. The localization of the cyclic plasticity and the development of cyclic slip bands resulting in fatigue crack initiation take place in material volumes which can be characterized as -near by oriented- regions. They correspond to the shear bands, which are characteristic for ultrafine-grained structure after equal channel angular pressing.