Open Access Conference Proceedings

Abstract: This paper deals with the influence of die surface orientation of roughness and die surface excitation on friction in metal forming processes. A way to evaluate friction coefficients from the flattening of long rectangular specimen was used for aluminium specimens with different die surface orientation of roughness. [..] Read more

Abstract: Accumulative roll bonding (ARB) is one of the severe plastic deformation methods of producing ultrafine grained laminated metal composites (LMCs). In order to obtain one‐body solid material, the rolling in ARB is not only a deformation process but also a roll-bonding process. [..] Read more

Abstract: Thermo mechanical treated steel API 5LX65 has high mechanical characteristics and is intended for the welding of main pipelines for the oil and natural gas transportation.The pipes made of this steel have a diameter of 42 '' (1066.8mm) and a wall thickness of 31.75mm.They were welded by narrow gap MAG welding selecting a filler metal for the root layer and another filler metal for the filling layers. Testing of the plastic deformation behavior of the welded joints was done by cold bending tests on both specimens in which the longitudinal axis of the welded joint is perpendicular to the axis of the support rollers and parallel to the direction of application of the force as well as on the notched specimens. [..] Read more

Abstract: This paper deals with influence of austenitizing and tempering temperature on microstructure, substructure and mechanical properties of creep resistant 9CrNB steel. Austenitizing temperature of 1050 °C was used with holding time of 15 min (state N1) and 45 min (state N3). [..] Read more

Abstract: A low pressure superheated hydrogen steam system has been used to accelerate the oxidation kinetics while keeping the electrochemical conditions similar to those of the primary water in a pressurized water reactor. A special corrosion apparatus was built in cooperation with University of Manchester and Škoda JS for the purpose. [..] Read more

Abstract: The microstructure and mechanical properties of Vanadis 6 ledeburitic tool steel, which was subjected to sub-zero treatment in liquid helium, has been examined with reference of the same material after conventional room temperature quenching. It has been found that the sub-zero treatment considerably reduces the amount of retained austenite, and increases the number and population density of carbides. [..] Read more

Abstract: Influence of sub-zero treatment and tempering on the microstructure of Cr-V ledeburitic steel Vanadis 6 has been examined. The samples were austenitized at the temperature of 1050 °C in a vacuum furnace, held at the final temperature for 30 min. [..] Read more

Abstract: The contribution deals with a thermographic method for a determination of fatigue limit of a cyclically loaded sample. Infrared thermography is a method for a noncontact temperature measurement. [..] Read more

Abstract: Metal Matrix Composites (MMC) combined with the concept of Functionally Graded Materials (FGM) offer potential to adjust the material properties based on the local load conditions. In this study, a sinter-forging process was deployed to produce an MMC wear component, consisting of a steel matrix and Fused Tungsten Carbide (FTC) particles, for later use in a hot forging tool. [..] Read more

Abstract: Nowadays, automobile emissions are one of the leading causes of air contamination. In this regard, the weight reduction of the vehicles structures and parts is vital, while the passenger’s safety is the first issue. [..] Read more

Abstract: During thermomechanically controlled processing (TMCP) of carbon steels, controlled rolling in no-recrystallization regime followed by directing quenching results in excellent mechanical properties, besides enabling cost-saving in respect of energy costs normally incurred during reheating and quenching procedure. The effects of three different combinations of Cr with 0.06 wt.% of Nb on the microstructures and mechanical properties of thermomechanically rolled and direct-quenched low-carbon (0.035 wt.%) microalloyed steel plates have been investigated to obtain balanced mechanical properties. [..] Read more

Abstract: One of the intensively studied issues regarding hydrogen embrittlement of advanced high strength steels (AHSS) is the absorption and diffusion of hydrogen produced by atmospheric corrosion. Scanning Kelvin Probe (SKP) is a tool sensitive enough to detect low amounts of hydrogen formed during atmospheric corrosion. [..] Read more

Abstract: The work is designed for the establishment of experimental techniques for replicating of highly-active neutron irradiated samples in SUSEN hot-cells. Using the most sensitive devices for dimensions and defects measurements of irradiated materials is limited due to the negative effect on their operation lifetime and accuracy. [..] Read more

Abstract: The carbide in X90CrMoV18 martensitic stainless steel governs both hardness and fracture toughness, which are the key performance of tool steels. Optimizing these opposite properties results in longer tool life by increasing the wear resistance. [..] Read more

Abstract: Dual phase steel has been significantly used in the automotive industry for the outer body parts. It has high strength, good formability and high toughness. [..] Read more

Abstract: This paper describes a methodology of small sample test technique for fracture toughness determination in the upper shelf region. The effect of size and strain rate has been investigated and described. [..] Read more

Abstract: Laser Powder Bed Fusion (LPBF) is an Additive Manufacturing technology in which a defined metal powder thickness is selectively melted with a laser, according to the geometry of the part being produced. The layer-by-layer approach allows manufacturing functional complex shaped components, with high structural integrity at low cost. [..] Read more

Abstract: Quenching and Partitioning method of steel heat treatment (Q&P) [1-4] consists of two steps: partial martensitic quenching (Q) followed by short annealing i.e. partitioning step (P). [..] Read more

Abstract: The aim of the work was to determine the influence of the quantity and distribution of carbides on the bainitic transformation process that takes place in 90SiCrMn6-4 steel. The kinds of possible carbides that can be formed in steel and the kinetics of their precipitation were examined by the use of computer simulations. [..] Read more

Abstract: The paper focuses on a detailed analysis of chemical heterogeneity of Inconel 625 overlays with an increased molybdenum content deposited by laser cladding. Fifteen samples of laser overlays on S355J2 steel were prepared, each with an area of 90×140 mm. [..] Read more