Metallurgical characterization of a sword blade dating from the second half of the 15th century found in central Slovenia was performed in order to determine its chemical composition, microstructure, microhardness, and to obtain insight into the methods of manufacture. The results show that the sword was manufactured from a single wrought iron billet. The surface of the sword was carburized. No evidence of quenching was found. The ferritic microstructure is concentrated in the core, and the pearlitic in the outer layer of the blade. This is nice example of bulk functionaly graded material.
F.27 Contribution to preserving/protecting natural and cultural heritage
COBISS.SI-ID: 1085534Process bases on the infiltration of metal melt in the pores of ceramic foam. Method of casting, sizing of mould, preheating of ceramic foam or mould, pouring temperature, use of insulating cover and vibrating enable complete filing the pores with metal. For manufacturing of composite plates the gravity casting and vibrating of total system during casting and solidification is used. Such composite plates are used in automotive, aircraft and military industry because composite plates have good mechanical properties, high break-through strength at low density and resistance to cutting.
F.32 International patent
COBISS.SI-ID: 17146902In Slovenia a new Centre of Excellence for Space Sciences and technologies SPACE-SI became operational in 2010 with members of our programme group having leading role with its foundation. The RTD goals of the SPACE-SI consortium consisting of academic institutions, high tech SMEs and large industrial and insurance companies are focused on nano and micro satellite technologies that are enabling high precision interactive remote sensing and precise maneuvering of small spacecraft in formation flying missions and development and testing of material for satellite structural parts.
F.05 Ability to launch new technological development cycle
COBISS.SI-ID: 7898708The problem of production of gradient castings has been addressed. The technology of production is a combination of the horizontal centrifugal casting of alloyed white cast iron (two sequences) and gravity casting of cores which occurs in third sequence. Working layer of the roll is made from chromium alloyed white cast iron. The core is made by spheroidal graphite cast iron (SGI). The main focus was on intermediate layer, which is made from flake graphite cast iron. Using numerical simulations the density of each microstructural constituent was determined. It was found that austenite and M7C3 type of carbides have difference in density for approximately 0,3 kg/dm3 which influences on the distribution of microstructural constituents in roll cross-section due to centrifugal forces.
F.06 Development of a new product
COBISS.SI-ID: 1501279In this work a new experimental procedure for physical simulation of the continuous casting process was developed. It was used for detail study of strain induced precipitation during continuous casting process. Temperature and deformation conditions to which the upper surface of the strand is submitted during casting, was precisely simulated. Parallel to experimental work a few different models to predict NbC precipitation were made. All of them are based on classical nucleation and growth theory. Models differ from each other on the treatment of nucleation process and diffusion transport of solute elements. We have developed a new model which, through the solution of diffusion equation in the vicinity of dislocation, deals with the influence of dislocations on both nucleation and the diffusion of solutes. The model, depending on the input parameters and the thermomechanical conditions, predicts time exponents between 1/3 and 1/5 for longer times for average precipitates size as a function of time, without explicitly modelling it, which was a positive surprise. Developed models were combined into a simulation tool for simulations of the kinetic of strain induced precipitation during very complex dinamical conditions during continuous casting of micro-alloyed steels.
F.17 Transfer of existing technologies, know-how, methods and procedures into practice
COBISS.SI-ID: 237264