Open Access Conference Proceedings

Abstract: Metal forming can be regarded as a process, during which materials are treated by “force” and “heating” under a certain external load and boundary condition (loading mode, rate of loading, constraint condition, geometry, contact friction condition, temperature field). Materials vary in formability and structure properties. [..] Read more

Abstract: Microstructure of the laboratory castings made from Fe-40at.%Al-Zr-B alloy was homogenized by the multi-pass hot rolling in protective capsules and subsequent lannealing. Based on the isothermal hot compression tests and EBSD analysis, the sufficiently accurate model describing the static recrystalization kinetics of the such prepared coarse-grained B2 iron aluminide after strain 0.2 was developed. [..] Read more

Abstract: The increase of susceptibility to plastic forming of magnesium alloys may be achieved by lithium addition in the amount of up to 15 % of alloy mass. At the same time by introduction of lithium which has density of 535 kg/m3 a significant weight decrease of the alloy is achieved. [..] Read more

Abstract: The Al-Mn-Fe-Si-Zr alloy was twin-roll cast and a part of the material was after casting annealed at 450 °C for 8 hours in order to allow the precipitation of the Al3Zr phase. Both modifications were further processed by equal channel angular pressing (ECAP) at room temperature. [..] Read more

Abstract: The development of deformable magnesium alloys and plastic forming methods has been strongly limited so far. Plastically worked magnesium alloys are very rarely used due to technological difficulties in plastic working and to high production costs. [..] Read more

Abstract: An in-line heat treatment of rolled materials is becoming frequently used by hot rolling plants. This method achieves the required material structure without the necessity of reheating. This paper describes a design procedure of cooling sections for obtaining the demanded structure and mechanical properties. [..] Read more

Abstract: The work roll surface in hot rolling mills suffers combined heat and mechanical load. The surface degradation leads to the formation of crack networks. [..] Read more

Abstract: Geometrically, there are two kinds of mould to achieve high-speed casting: funnel-shaped and parallel mould. The mould shape and high casting speed leads to higher mould temperatures and shorter mould life than in conventional slab casters. [..] Read more

Abstract: Simulation of the stress-strain state of the rolls with the active and the passive experiments needed to determine the stresses, strains and displacements of rolls of finishing stands UWRM -1700 used for the construction of the shape of the active generatrix of profiled work rolls needed to improve the profile and flatness hot rolling mills. The main deformation of four-roll systems is sag and elastic compression of the support and work rolls. Key influence on the quality of hire has a value of deflection of the work roll. The object of research is rolls of finishing stands of UWRM-1700 of JSC "ArselorMittal Temirtau". [..] Read more

Abstract: In the present study, the effects of TiB2 ceramic on the density, mechanical, tribological properties and microstructure were investigated. The austenitic stainless steel/TiB2 composites with various volume of TiB2were prepared by Spark Plasma Sintering (SPS). [..] Read more

Abstract: The paper deals with the problematic of weakening of the original austenite grain boundaries which often takes place during the processing of heavy forgings. This phenomenon occurs predominantly in regions of locally coarsened grains during the long dwell times at temperatures of forging or primary heat treatment and can cause development of intercrystalline fracture even before the final heat treatment of forgings. [..] Read more

Abstract: The influence of relatively high heating rates (100 - 300°C/s) and low soaking times (5s) on the microstructure and mechanical properties of a cold rolled low carbon steel was studied. Annealing treatments with different heating rates were performed on a 0.15C - 1.2Mn (wt.%) steel in order to study recrystallization, austenite transformation and growth of ferrite and austenite. [..] Read more

Abstract: High strength and ductility of the TRIP (Transformation Induced Plasticity) steels is attributed to the transformation induced plasticity effect resulting from the strain induced martensitic transformation of the retained austenite in the multiphase (ferrite, bainite) microstructure. The precise characterisation of the multiple microstructure of low alloyed TRIP steels is of great importance for interpretation and optimalization of their mechanical properties. [..] Read more

Abstract: The microstructure, with a particular focus on carbides, of Cr-V ledeburitic steel Vanadis 6 has been examined in various stages (soft-annealing, quenching, sub-zero treatment, tempering) of the heat treatment process. The characterization of the carbides was done using the scanning electron microscopy, transmission electron microscopy and X-ray diffraction. [..] Read more

Abstract: Several innovative methods of heat and thermo-mechanical treatment have been recently developed to improve mechanical properties of high strength low alloyed steels. On the base of the experience obtained during the development of TRIP (transformation induced plasticity) steels, other methods have been proposed which also use positive effect of multiphase microstructure with controlled amount of retained austenite to achieve excellent strength to ductility ratios. [..] Read more

Abstract: This work is a contribution to the research of modified heat resistant steel P92. This steel is currently one of the best modified chromium steels in terms of achieved values of creep rupture strength. [..] Read more

Abstract: The tensile behavior and bendability of B-bearing martensitic steels with carbon 0.15 and 0.29% were investigated. After austenitized at 900 °C for 6 min and quenched in the closed tool, full martensiticmicrostructure was obtained in the steels with 1.5mm in thickness. [..] Read more

Abstract: The paper deals with the study on creep behavior and minor phase evolution in two types of heterogeneous weld joints of P23 and P91 steels during long-term creep exposure at 550 °C. The filler material in Weld A corresponded to P91 steel and the filler metal in Weld B was similar to the chemical composition of P23 steel. [..] Read more

Abstract: Surface coatings protection is one of the most important processes ensuring efficient and economic use of basic materials, mostly of lower-quality. At interface of clad and basic material intermetallic phases are formed, representing quite different matrix with dissimilar properties unlike the welded materials. [..] Read more

Abstract: Changes in dislocation substructure were studied in solution annealed S235JR steel in relation to the number of symmetrical reversed stress cycles with the amplitude σa = 242 MPa and corresponding mean life Nf = 17 950 cycles. The microstructure of the steel consisted of ferrite with a small amount of pearlite. [..] Read more