Open Access Conference Proceedings

Abstract: On the surface of a 17-4 PH stainless steel, powders from the cermet group were submitted, using the plasma thermal spray technique on a METCO SULZER installation. Thereafter, a part of the sprayed samples were remelted at the surface withu the Nd:YAG laser beam, on a Trumpf HL 123 LCU installation. [..] Read more

Abstract: This work contains a detailed description of the influence of continuous heating from as-quenched state on microstructure development in the 17-4PH steel. The temperature ranges of the phase transformations occurring during heating from the as-quenched state (tempering) were determined from dilatometric tests. [..] Read more

Abstract: For many years, low alloy CrMo(V) creep-resistant steels are applied for parts in the construction of energy and chemical structural units working under creep conditions (temperature about 550 °C and pressure about 15 MPa). These steels most often include creep-resistant steel 13CrMo4-4 (ČSN 15 121), 14MoV6-3 (ČSN 15 128), 10CrMo9-10 (ČSN 15 128). [..] Read more

Abstract: The microstructure of sub-zero treated Vanadis 6 tool steel has been examined with reference to the same material without the application of sub-zero treatment. Changes in the microstructure were recorded using light microscopy, scanning electron microscopy and transmission electron microscopy. [..] Read more

Abstract: Today’s advanced steels are required to possess high strength and ductility. One way of achieving a favourable ductility level and a very high ultimate strength is to stabilize retained austenite in martensitic matrix. [..] Read more

Abstract: This work presents results of the analysis of phases formed in a SUPER 304H steel during a medium-term static isothermal ageing (675 °C/15000 h). The investigations of the precipitates were especially focused on the occurrence of sigma-phase because its formation leads to the serious embrittlement.The evaluation and distribution of brittle sigma-phase were determined on macroscopic level by using light microscopy/colour etching. [..] Read more

Abstract: The hereby work presents the influence of an additional annealing prior to heat treatment on the final properties of investigated steel. Often companies despite softened conditions of ordered materials are performing further annealing. [..] Read more

Abstract: This paper assesses the possibilities of graphitic cast iron parts and components of hydraulic turbines. The experimental program evaluated the behavior of spheroidal and vermicular graphite under conditions which simulated challenging work environment hydraulic machines. [..] Read more

Abstract: Hydrogen diffusion characteristics were studied in C-Mn-Si TRIP 800 steel containing 0.05 mass % of phosphorus. The steel was tested in as-received state and also in states corresponding to 5 and 10 % tensile deformation. [..] Read more

Abstract: Creep test to the rupture of the dissimilar weld joint made of COST FB2 and COST F martensitic steels was carried out at temperatures ranging from 550°C to 650°C in the stress range from 70 to 220 MPa. Creep rupture strength was evaluated using Larson-Miller parameter. [..] Read more

Abstract: A series of high entropy alloys (HEAs), Cr1-xCuxMnFeNi, was produced by a vacuum arc-melting method. The multi-element systems can crystallize as a single phase, despite containing multiple elements with different crystal structures which often exhibit unusual properties. [..] Read more

Abstract: Active thermography is an advanced experimental procedure, which uses a non-contact measurement of tested materials thermal response after their external excitation. The material can be excited by a direct heating or using thermo-physical effects. [..] Read more

Abstract: The wear resistance of the material and the wear mechanism are considered as the most important properties of tool materials. Changes in microstructures of tool materials may also results in the wear mechanism changes. [..] Read more

Abstract: Residual stress is an elastic stress in remaining part after the various stages of production. If residual stress values in rails are known, mechanical properties of rails and their effects in railway can be predicted. [..] Read more

Abstract: Subject of this article are the results of gradient tubes analysis (material of the shell: 347H, material of the body: 11CrMo9-10) based on Amec Foster Wheele specifications requirement. The aim of the analysis was the determination of mechanical and technological properties of gradient tubes in order to install the gradient tubes in a commercial boiler. [..] Read more

Abstract: A failure analysis has been performed to investigate the root cause for the rejection of the H10 (DIN 1.2365) hot work tool steel of the Hatebur forging machine. The punch is subjected to intensive thermal shocks, cyclically variable loads and high pressure at high temperatures. [..] Read more

Abstract: Soft annealing is an important and time demanding part of bearing steel treatment process. The experimental program of accelerated carbide spheroidisation deals with significant shortening of the time necessary for producing steel microstructure consisting of ferritic matrix and globular carbides. [..] Read more

Abstract: Steel 34CrMo4 is world widely used steel type for the variety of products, for example forgings, castings, shafts, bars etc. Desired mechanical properties of mentioned steel can be achieved by various treatments such as in a metallurgical process by titanium, niobium, vanadium, zircon or nitrogen microalloying. [..] Read more

Abstract: The subject of the research is study of an elastic-plastic behavior of the materials, S355N steel and Domex700MC steel, which are used in welded construction parts of car bodies, the Domex700MC steel is used with the intention of decreasing the weight of the parts. The solved problem is to determine the local static parameters of the steels without the possibility to use the standard mechanical testing. [..] Read more

Abstract: Delamination or laminar flaws were sometimes detected during manufacturing and/or plant operations. A laminar flaw is a subsurface flaw parallel to the rolling direction of the plate. [..] Read more