FZD MTF STU (01.01.2007-31.12.2008)
Doc. Ing. Jozef Janovec, DrSc.
Slovakion - Research of cluster structures and nanomaterials
The Faculty of Materials Science and Technology of STU acquired from the Forschungszentrum Dresden-Rosendorf a high-resolution transmission electron microscope PHILIPS CM300 with acceleration voltage of 300 kV, LaB6 cathode, and lateral resolution of 0.14 nm. It enables also nanodiffraction and EDS. After small modifications of the microscope the electron tomography presenting 3D-images of nanoparticles will also be available. The microscope is unique equipment in Slovakia from the technical parameters point of view. The microscope will be used mainly for the characterization of thin layers, nanolayers, multilayers, interfaces, complicated cluster structures in complex metallic alloys and ceramics, and 3D-nanopartricles of various types. A complex nanoscale analysis of the material possible in the microscope will also extend the state of knowledge about conventional materials (e.g. high-strength low-alloy steels, aluminium and titanium alloys, nickel superalloys).
IFW MTF STU (04.07.2008-31.12.2010)
prof. Ing. Jozef Janovec, DrSc.
Investigation of fine structures in metallic materials using TEM
With the intention to improve the investigation of fine metallic structures at the Faculty of Materials Science and Technology of STU, the IFW provided financial resources for purchase ancillary units for TEM (Delta Abrasiment).
COST MP0602 (COST) (05.08.2008-15.05.2011)
Prof. Ing. Jozef Janovec, DrSc.
Preparation and characterisation of lead-free solders
The project is focused on processing and investigation of properties of novel lead-free solders for high-temperature applications. New solders developed in the frame of the project will consist of various combinations of tin, zinc, cobalt, silver, copper and rare earth elements. Thermodynamic and kinetic aspects of soldering will be studied. Phase equilibria and formation of intermetallic phases at the solder/substrate interface will also be investigated.
EUREKA E!3437 (01.01.2005-01.01.2008)
Ing. Mária Hudáková, PhD.
Progressive surfacing of metals
The main and general goal of the project is to improve and optimize surface properties of advanced metallic materials through the physical and chemical deposition of thin and hard layers and their combinations. The efforts leading to the reduction of wear, corrosion, and generally to the prolonging of the service-time of tools and engineering parts is the main driving force for development of suitable surface technologies for the metallic materials.
No. S-13-2005 (01.09.2005-31.12.2050)
Ing. Martin Kusý, PhD.
Visegrad Scholarship-Structure and properties of X40CrMoV5-1 hot-work steel melted and alloyed by tungsten carbide WC with the high power diode laser (HPDL)
It was found out, based on the research carried out, that it is feasible to develop the surface layers on the X40CrMoV5-1 hot-work tool steel by remelting and alloying with the tungsten carbide using the high power diode laser (HPDL). The structure of the material solidifying after laser remelting is characteristic of the diversified morphology connected with the repeated changes of the crystals' growth direction, from small dendrites, whose principal axes are oriented in accordance with the heat removal directions at the boundary between the solid and liquid phases, clusters of carbides arranged in accordance with the swirls caused by the metallic liquid convection motion, and partially non-remelted WC conglomerates as alloying material in the central zone. The very fast heat removal from the remelting zone by the material core with the much larger thermal capacity, decides the martensitic transformation of the austenite originated due to crystallization, and the lathe martenzite developed in this process, partially twinned, is characteristic of the significant refinement of the martenzite with the martenzite lathes' length several times smaller that than of the ones of the martenzite developed during the conventional quenching. Laser remelting and alloying with the tungsten carbide results in the refinement of the structure in the entire laser power range and in the remelted zone is about twenty times smaller compared to the conventionally heat treated material. Increase of the steel surface hardness to 66.5 HRC occurs due to refinement of the structure. The research results indicate to the feasibility and purposefulness of the practical use of the remelting and alloying with the tungsten carbide using the high power diode laser, e.g. for making new tools or for regeneration of the used ones from the X40CrMoV5-1 hot-work tool steel.
Bekaert, Zwevegem, Belgium (26.05.2008-25.05.2010)
Ing. Martin Kusý, PhD.
Progressive materials, processing and automation
