Open Access Conference Proceedings

Abstract: In the stamping process, springback causes geometrical inaccuracies in the final shape of metal stampings. Springback behavior is highly influenced by mechanical properties of the material, by the geometrical complexity of the shape and also by stamping process itself. [..] Read more

Abstract: The critical strain for initiation of dynamic recrystallization is an important value in case of thermomechanical process design. In this research, different models have been utilized to describe hot compression flow curves of C45 carbon steel up to the peak point. [..] Read more

Abstract: This article describes problems related to the lifetime of tools used for hot forging. The results of industrial tests, involving the application of ZeroFlow nitriding for the purpose of improving tool lifetime, are presented. [..] Read more

Abstract: The paper presents the results of the outer surface quality examinations of Zr-1%Nb alloy tubes after the process of pilger rolling with a deformation of ε=72% on a KPW rolling mill. For the analysis of the effect of the strain rate and the degree of deformation of the magnitude of the yield stress σp of the investigated alloy, an experiment was programmed based on the industrial conditions and physical modelling of the rolling process was carried out. [..] Read more

Abstract: The paper presents the results of numerical modelling of fixed-end hot torsion testing for conditions characteristic of the STD 812 torsion plastometer. The material used for the tests was a hard deformable aluminium alloy in grade 5019. [..] Read more

Abstract: In this paper, influence of initial structure of C45 medium-carbon steel on the value of its flow stress was examined. The research was based on comparison of experimental stress-strain curves acquired using uniaxial compression tests of two initial structural states. [..] Read more

Abstract: The forming properties and simulated side impact crash tests of two types of B-pillar reinforcements were analysed. The first B-pillar was drawn from simple blank made of dual phase steel DP600 with thickness of 1.2 mm. [..] Read more

Abstract: Indefinite chill cast iron rolls are commonly used in the finishing stands in hot strip rolling mills. Due to characteristic rolling conditions in these stands and due to a hypoeutectic ledeburitic microstructure with graphite inclusions in the working layer, the mechanism of thermo-mechanical wear is different from earlier stands. [..] Read more

Abstract: Due to environmental concerns and safety regulations in the automotive industry the development of strong and lightweight cars has been a very significant topic in the last years. One of possible solutions to this matter is to use materials with lower density or lower thickness. [..] Read more

Abstract: The paper deals with comparison of forging technology and selected forming factors on structure of the steel EN X160CrMoV 12 1.Steel under investigation is a high-alloyed Cr-Mo-V tool steel for exploitation both in hot and cold conditions. The steel is characterizsed by difficult formability and high resistance to deformation in the whole range of the forging temperatures. [..] Read more

Abstract: The influence of two variants of initial soaking at 1120 °C / 2 h and 1180 °C / 2 h and parameters of hot plastic working on the deformability of an IN 718 type superalloy have been presented. The hot deformation characteristics of alloy were investigated by hot torsion tests. [..] Read more

Abstract: The hot deformation behaviour of Ni55Cr45 alloy was investigated by isothermal compression test on the GLEEBLE 3800 thermo-mechanical simulator in the wide range of temperatures (750 – 1150 °C ) and strain rates (1 – 100 s-1). The experimental stress-strain data were employed to develop the constitutive equation and activation energy of the investigated Ni-Cr alloy. [..] Read more

Abstract: The hot deformation behavior of a modified nickel-based Nimonic 263 superalloy, based on the physical simulation using torsion tests at different deformation temperatures (1200°C, 1050°C and 900°C) and strain rates (0.01, 0.1 and 1 s-1) has been studied. The flow stress curves showed an initial strain-hardening followed by a peak stress revealing the occurrence of dynamic recrystallization. [..] Read more

Abstract: Modern high-efficiency heat exchangers used in renewable energy systems are more and more often based on light metals and their alloys. The reasons for this are both economic and technical. [..] Read more

Abstract: The experimental results of the combination extrusion process for ENAW-1050A aluminium alloy are presented. Depending on the punch and die sizes used, the tests were performed for three different values of relative strain in backward direction, 2, and a constant strain in forward direction, 1. [..] Read more

Abstract: The paper presents the results of neural network sensitivity analysis used in prediction system of tool durability in die forging processes. Data collected during many experiments, tabulated in the form of knowledge vectors, has been used as a source of training data for artificial neural networks. [..] Read more

Abstract: Within this work an experimental set-up was designed and constructed. It allows axial vibrations application to replaceable punches with a frequency of 20 kHz. [..] Read more

Abstract: One of the modern industry trends is to be able to manufacture components of relatively small size using traditional or new technologies. Smaller components usually need special assembly techniques. [..] Read more

Abstract: The paper contains results of fractal analysis of oxide layers formed on steels used in the power industry. The studies were carried out on elements taken from three steel grades: 13CrMo4-5 (T = 470 °C, t = 190000 h), X10CrMoVNb9-1 (T = 535 °C, t = 75000 h), 10CrMo9-10 (T = 575 °C, t = 100000 h). [..] Read more

Abstract: The article describes the state of the art computer simulation in the field of metal forming processes the main problem points of traditional methods were identified. The method, that allows predict the deformation distribution in the volume of deformable metal with taking into account of microstructure behavioral characteristics in deformation load conditions, was described. [..] Read more