Based on the research work done in the field of materials characterization and development of new mwthod for the determination of fracture toughness of brittle metallic materials dr. Podgornik and dr. Leskovšek were invited to act as guest editors for special issue of Materials Performance and Characterization journal devoted to Fracture toughness. In this special issue 30 contributions from the field of fracture toughness modeling, measurement and analysis were edited and published. In this special issue also contribution from dr. Podgornik, describing nonstandard circumferentially notched and precracked specimen used for measuring fracture toughness of brittle materials, like tool steels.
C.03 Guest-associated editor
COBISS.SI-ID: 1081002Research in the field of high and ultra high strength steels indicates that appropriate modification of spring steel with increased content of Si, Mo, Ni and Cr, and the addition of B and Ti gives the possibility of producing steels with yield strength of over 1600 MPa and decarburization depth below 0.3 mm. It was found that Si and Cr have the biggest influence on mechanical, as well as on dynamic properties of spring steel, with their high content providing sufficient resistance to decarburization, high yield strength and good dynamic properties. Research results led to the development of a new series of highstrength spring steel with a tensile strength of over 2000 MPa, and high level of impact and fracture toughness.
F.06 Development of a new product
COBISS.SI-ID: 110429822th International Conference on Materials and Technology, 20th-22nd October 2014, Portorož, Slovenia, GODEC, Matjaz (Editor) The main organizer of the international conference.
B.01 Organiser of a scientific meeting
COBISS.SI-ID: 275977472Based on microstructural and microchemical analyzes, we made observations and assessment of why they have a comparative commercially available magnets better mechanical strength and are less crumbly during their manipulation. The results of the analysis made it possible to change the parameters of manufacturing magnets and thereby improve the mechanical properties.
F.07 Improvements to an existing product
COBISS.SI-ID: 1109418The book covers the characterization and modeling of polycrystalline metallic material (spring steel) microstructures, with the aim being to better understand the complex problem of predicting material properties based on a knowledge and representation of the microstructure. The microstructure features of the spring steel were studied on numerous samples in order to understand the basic geometrical characteristics needed to build the model. An overview of light microscopy, scanning electron microscopy, and Auger electron spectroscopy techniques is provided. Some general aspects of the methods used for the microstructure modeling are provided. The method using neural networks and genetic algorithms is an original breakthrough contribution and provides the foundation for a completely new approach to the modeling of metallic materials. The representation of a random grain structure (as an object) is realized using the neural networks. The manipulation and optimization of the randomly generated grain shape is achieved by the genetic algorithms. The established concept of the 2D modeling is designed and can be directly used in the 3D space.
B.06 Other
COBISS.SI-ID: 1024170