Open Access Conference Proceedings

Abstract: Examination of structure-forming processes of HSLA steel with 0.025 % Nb was performed in relation with rolling of the heavy seamless tubes in the Big Mannesmann mill. Based on the dilatometry data, a DCCT diagram after deformation 0.35 at temperature of 900 °C was designed. [..] Read more

Abstract: Owing to its versatility and the ability to provide the final products with advantageous characteristics, rotary swaging is widely used in automotive industry for production of various components. The focus of this study was to perform numerical prediction of rotary swaging of a steering tube. [..] Read more

Abstract: The aim of our study was to investigate the cold rotary swaging on the Ti6Al4V alloy with a finite element modelling (FEM) and subsequently by experimental verification of the model predictions. The experimental examination was evaluated both cast and swaged material states. [..] Read more

Abstract: The abnormal prices of copper and aluminum over the last decade have led to increasing substitution of copper with aluminum. This is mainly possible due to the favorable relation of the strength properties of aluminum to its density with respect to copper. [..] Read more

Abstract: Trend in the area of boiler tubes in the energy sector specifically characteristics of the tube properties, not only from the perspective of material properties, but focuses mainly on the internal tube surface. For the inner surface is primary substance to lead heat transfer medium in the most efficient manner. [..] Read more

Abstract: The work presents the results of a study on drawability evaluation methodology of thin sheet metals of high strength. Materials of high strength are used for the construction of car and aircraft components. [..] Read more

Abstract: Deformation characteristics of carbon steel are studied in the temperature range 900 - 1200 °C and strain rates 0.1 - 100 s-1 on the plastometr Gleeble using compression tests on cylindrical samples. Processed a single dissipation maps in the field of forming are developed on the basis of changes in the effectiveness of dissipation, depending on temperature and deformation resistance, taking into account the strain rate. [..] Read more

Abstract: The article presents the influence of the metallurgical process condition on the parameters of drawing M95 brass rods obtained in the continuous casting process. This work has investigated the effect of input material composition (scrap selection), diversified casting speed (various feeding and stopping time) to allow for crystallization and cooling intensity on cast quality, including solid particles removal. [..] Read more

Abstract: One solution to overcoming these challenges is to optimize by tailoring microstructures of the copper plates used in the new tundish plate’s critical components. An approach that has proven effective in improving the thermal resistance of material to intergranular degradation is grain boundary junction in copper (GBJC) [1]. [..] Read more

Abstract: Cold-drawn high-carbon steel wire with pearlite microstructure is one of the most popular raw material for modern reinforcing ropes. Lamellae thinning, changes in interlamellar interface and metallographic texture, strain localization are the main property-forming phenomena in the wire drawing process. [..] Read more

Abstract: Since thermomechanical treatments favors increased mechanical resistance characteristics of steels, their degree of alloying is lower than that of any found in normalized steel with the same strength.This is extremely beneficial for the weldability of steel.To prevent the emergence of unwanted micro-structural transformations in welded joint areas (softening HAZ, excessive growth of grain, cold cracking), the present paper aims to implement the narrow gap MAG welding of steel X65M intended for the fabrication of pipeline used for the transportation of natural gases and liquid hydrocarbons.Root and hot layers have been welded using MAG spray arc and the fill layers in pulsed current.The equipment used is composed by an internal welding machine for the root pass and external one with two welding torches for the fill layers, where the pipe is fix and the welding equipment make an downward vertical orbital movement around the pipe.Assessments of the quality of the welds are done through macro- and micrographic analyzes in conjunction with sclerometer examinations. Read more

Abstract: The CMT/CMTP braze-welding process is characterized by interruption of a short-arc at low welding current values, which is controlled by an invertor source. Thereby, the used energy is lowered by short time (about 1 μs) before reignition of the electric arc. [..] Read more

Abstract: Mechanical testing and cyclic fatigue testing belong to the important material examinations. Standard fatigue testing is mostly time-consuming and needs a number of identical samples that makes the testing expensive. [..] Read more

Abstract: Paper deals with the martensitic stainless steel (MSS) after reversed extrusion and broaching, quenching into polymer from austenitization temperature of 1130 °C and subsequently tempered at 480 °C with final cooling in the air. Wall thickness of cylinders corresponded to 5 mm. [..] Read more

Abstract: Nanoporous ceramic products from pure aluminum oxide were fabricated by plasma spraying method. The deposition process consists of passing of sprayed material particles with high velocity through plasma flow and subsequent coating of these particles on the surface of rotating metal forming mandrel. [..] Read more

Abstract: Favourable impact of sub-zero treatment on variety of important properties of tools is known over a long period. Alternatively, metallurgical principles responsible for elevated hardness, improved wear performance, changes in the tempering response and toughness, and better dimensional stability are known only over the last few years, and they have never been presented in all their complexity. [..] Read more

Abstract: Electro-slag remelting is one of the ways to produce high-strength metal. For this reason, the machining of electro-slag metal is difficult. [..] Read more

Abstract: Heat treatment is the most widespread treatment of metal products. The modes of heat treatment are developed for most existing metals. [..] Read more

Abstract: The microstructure, the phase constitution and hardness of Cr-V ledeburitic tool steel Vanadis 6 subjected to sub-zero treatment with several soaking time in nitrogen vapors have been investigated. The metallurgical aspects include reducing the amount of retained austenite and increasing carbide count, so wear resistant and dimensional stability are better as compared to conventionally heat treated material. [..] Read more

Abstract: The key characteristic of austenitic Hadfield steel is high resistance to the abrasion wear. Different applications mean various operating conditions and different types of abrasive wear.This paper compares the two abrasive resistance testing methods on rolled sheets of manganese (Hadfield) steel. [..] Read more