Open Access Conference Proceedings

Abstract: The key characteristic of austenitic Hadfield´s steel is its toughening (hardening) under mechanical loading (during operation). By the influence of mechanical loading austenite transformed to martensite, resulting in surface hardening (curing) with a good toughness. [..] Read more

Abstract: Recent research by the steel industry focuses mainly on the high strength steels with excellent formability. A new look at the role of individual elements generally used for steels and the possibility of new metallurgical technologies application have led to the development of steels with a wide range of mechanical properties and formability used in automotive industry. [..] Read more

Abstract: A study of fatigue crack initiation and growth in 316L austenitic stainless steel is reported. Fatigue experiments were performed at room temperature on full cylindrical specimens cycled axially (tension-compression) and on hollow cylindrical specimens tested in reversed torsion. [..] Read more

Abstract: The high alloyed austenitic manganese steel, the Hadfield steel (C = 1.2 %, Mn = 12 %, Si = 0.45 %), thanks to its good wear resistance of the running surface and maintaining the high toughness of the internal material, is successfully applied for casted crossings. The crossings are the most dynamic stressed components in the railway turnouts. [..] Read more

Abstract: The aim of the paper was to determine the influence of used technology on the tribological properties and the erosive resistance of X2CrNi18-9 base sintered materials. In the work was made the analysis of processes the high temperature isostatic pressing and sintering in deep vacuum. [..] Read more

Abstract: This work presents the comparative results of twin-spot laser welding of complex phase and transformation induced plasticity steels. Both steels include Nb and Ti microalloyed elements. [..] Read more

Abstract: In this study, the quantity, size and type of non-metallic inclusions occurring in laser welded transformation induced plasticity (TRIP) and complex phase (CP) steel joints were identified using SEM and EDS techniques. Both steels include Al, Ti, and Si additions which are characterized by high chemical affinity to oxygen. [..] Read more

Abstract: A hot rolled TRIP steel was selected for the laboratory scale process simulation. The ferrite and bainite transformation kinetics on the run out table and during coiling were mapped as a function of temperature and austenite conditioning by Leblond and Devaux’s concept. [..] Read more

Abstract: Grain oriented electrical steels (GOES) produced by the AlN + Cu technology usually contain ca 0.5 wt. % of Cu. [..] Read more

Abstract: In this study, the impact of corrosion in S400 grade of reinforcing steel bar as for the mechanical performance on seismic loads (low-cycle fatigue LCF) was investigated. The mechanical performance and life expectancy of S400 grade of reinforcing steel bar on seismic loads was evaluated based on the strength degradation (reduction of maximum strength) during its loading time period, under corrosion or not circumstances. [..] Read more

Abstract: Shape memory polymers are a special type of polymer, which can recover the permanent shape upon the application of external stimulus. The main advantage of shape memory polymer is the ability of recovering a large amount of strain (usually >400%) in comparison to shape memory alloys (SMP-up to 15%) and shape memory ceramics (2-3%).The material used in this research is Shape Memory Polymer due to its excellent shape recoverability. [..] Read more

Abstract: Laser cladding is a progressive technology enabling to deposit coatings in thickness higher than 1 mm. In comparison with the conventional overwelds it offers the advantage of thinner heat-affected zone in the substrate material and lower and better controlled inner residual stress and related deformation. [..] Read more

Abstract: In the paper, the technologies of thermal spraying and laser cladding are briefly described. The traditional methods are reminded and compared with lately developed ones. [..] Read more

Abstract: The paper summarizes the result of laser cladding experiments design to observe the influence of the mutual angle of the cladding head and treated sample. The system, combining solid state disc laser with power up to 5,3 kW and cladding head with coaxial powder feeding, was used. [..] Read more

Abstract: Technological lasers are a useful tool for laser welding as well as other material treatment and production processes. Lasers with an optical scanning head are the important group of technological lasers. [..] Read more

Abstract: The paper solves the cause and character of the damages of tubes, or evaporator tubes made of refractory carbon steel L290NB, used for the evaporators of combustion chambers of steam boilers used for production of steam, and necessary for subsequent production of electricity. Based on the evaluation of steel samples defected by perforation with incrustation deposit, the mechanism degrading the material of evaporator boiler tubes was discovered. [..] Read more

Abstract: Laser surface texturing (LST) is one of the methods for obtaining surfaces with specific properties. In this paper the influence of initial surface state of sliding bearing steel on laser texturing of this material was studied. [..] Read more

Abstract: This study examines the relation between surface condition and its response to interaction with a laser. The surface character is modified by the creation of oxide layer. [..] Read more

Abstract: The paper presents the influence of the forming way of test pieces on measured values of the mechanical properties of steel for plastic cold processing. During research the two-dimensional samples were analysed after forming by die shearing, milling and electrical discharging, at an angle: 0, 45 and 90 o with reference to the rolling direction. [..] Read more

Abstract: The paper shows the evaluation of delamination of HDG coating. The HDG coating adhesion was evaluated by impact test and by pull-off test. [..] Read more