Open Access Conference Proceedings

Abstract: The paper presents experimental results concerning changes in strength and fracture toughness characteristics of Hardox-400 high-strength steel in brittle-to-ductile temperature range from -100 °C to +20 °C. It was shown that the values of strength properties increased linearly with the lowering of the temperature during the test. [..] Read more

Abstract: The Selective Laser Melting (SLM) is an advanced technology of producing three-dimensional solid objects by 3D printing from a digital file. The article deals with fatigue push-pull testing of SLM samples to determine the dependence of their fatigue characteristics on the orientation of laser melted layers to the loading axis, the hatch spacing of the laser beam and the surface roughness of 3D printed objects. [..] Read more

Abstract: This research is concerned with the effect of titanium in the range 0.01 to 0.13 wt. % on the base plate and weldability properties of laboratory hot-rolled cold-formable steels with yield strengths in the range 500 – 900 MPa (S500MC - S900MC). [..] Read more

Abstract: The microstructures of complex phase 780C steel and TRIP 690T steel joints with thickness of 1.5 mm welded using fibre laser process were evaluated. The microstructures and microhardness of butt joints were characterized in the fusion zones and heat affected zones. [..] Read more

Abstract: Proposition of a Cellular Automata (CA) model of carbonitride precipitation to simulate image of microstructure in microalloyed niobium steels is presented in the paper. CA model proved to be very efficient in modeling various phenomena in material science. [..] Read more

Abstract: The susceptibility to the hydrogen embrittlement of commercial heat of TRIP 780 steel of the type C-Mn-Si was studied on previously hydrogenated samples by a slow strain rate tensile tests (SSRT) in the initial state and in the state after 5% deformation in the longitudinal and transverse directions relative to the rolling direction. Samples were hydrogenated in 0.1N sulfuric acid solution with the addition of KSCN. [..] Read more

Abstract: Mould powders significantly influence the correct course of steel continuous casting process, the surface quality and subsurface structure of round billets. For many users of continuous casting equipment the choice of proper mould powder for the local condition of casting process is still the essential problem. [..] Read more

Abstract: This work deals with the proposal for the new evaluation system of calibration data in the VÍTKOVICE STEEL Testing laboratories. The main purpose of this work is the best possible use of the information obtained during regular calibrations of Charpy impact machine performed according to standard ČSN EN ISO 148-2:2010 - Metallic materials – Charpy pendulum impact test – Part 2: Verification of testing machines, and ASTM E23 – 16 Standard test methods for notched bar impact testing of metallic materials. [..] Read more

Abstract: The subject of the study is theoretical modeling for analysis of the microstructure development in progressive droughts of the forging sequence aimed at prediction of the parameters of austenite in as-forged condition, prior to and after direct cooling. Based on numerical calculation of temperature, strain and strain-rate, dynamic recrystallization kinetics were analyzed with use of Johnson-Mehl-Avrami-Kolmogorov (JMAK) model, and the transformed ferrite grain size was calculated, with the use of Hodgson-Gibbs and Sellars-Beynon models. [..] Read more

Abstract: The article deals with the evaluation of chosen parameters of surface roughness on the square section samples from stainless steel 316L (1.4404), manufactured by the additive technology with using Selective Laser Melting method (SLM). As part of the experiment was measured (scanned) and compared of chosen parameters of surface roughness on plane area of the samples printed in the same process parameters with a difference of power of the laser. [..] Read more

Abstract: The article deals with the study of verification and evaluation of selected mechanical properties of stainless steel 316L (1.4404) after the production of additive technologies (3D printing) by Selective Laser Melting (SLM). For the purpose of the experimental testing were printed two sets of samples from the powder metal by the laser-sintering process at different process parameters. [..] Read more

Abstract: The paper deals with the use of small samples for fatigue tests of two types of steels used for power plant components. The main advantage of small fatigue samples is the possibility of their use in cases, where sufficient amount of material is not available for standard test specimens manufacturing. [..] Read more

Abstract: The paper deals with the development of new clamping jaws which are designed for static tensile tests of miniature test specimens. The jaws are used to hold specimen of dimensions 2 x 1 - 20 mm. [..] Read more

Abstract: Paper deals with evaluation of effect of high pressure hydrogen environment with actual pressure of hydrogen up to 30 MPa on fatigue crack growth rate properties of structural steel used for cylinders production. 34CrNiMo6 grade steel was used for experimental programme. [..] Read more

Abstract: This paper concerns the mathematical and numerical modeling of thermal phenomena in the laser-arc hybrid welding process with the motion of liquid steel in the welding pool taken into considerations. Developed models are used in computer simulations of hybrid welding process with assumed different relative arrangement of heat sources in the process. [..] Read more

Abstract: This paper discusses the wear of the turning tool bit in face turning under lubricated friction conditions. The test results obtained after wet turning, i.e. [..] Read more

Abstract: Fracture toughness (KIC) is the one of the most important parameters for evaluating the fracture resistance of the machine elements or structural parts subjected to cyclic loading. These cyclic stresses can cause damage or premature failure. [..] Read more

Abstract: The subject of the work is to present the possibility of using a non-contact optical system for measuring strains. Dantec's multi-unit Q-400 3D image correlation system was used. [..] Read more

Abstract: Steels in the cooling water circuits are most vulnerable to localized corrosion, crevice corrosion or deposit corrosion, intergranular corrosion. Austenitic steels excel in their resistance to corrosive environments. [..] Read more

Abstract: This paper concerns computer analysis of stress states and numerical prediction of the formation of deformations in T-joint welded by a laser beam technique. Numerical analysis of thermomechanical phenomena are carried out in Abaqus / FEA commercial engineering software, which is based on finite element method (FEM). [..] Read more