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Purpose: The paper presents new knowledge from numerical modelling of porosity in heavy steel ingot using ProCAST software. The main aim of numerical modelling realized under the conditions of the Department of Metallurgy and Foundry and Regional Materials Science and Technology Centre at the VSB-TU Ostrava is the optimization of the production of heavy steel ingots produced at the companyVítkovice...
Purpose: The main aim of research was to analyse the exponents values assigned to operations in relative manufacturing costs estimation method based on the similarity theory. Design/methodology/approach: The manufacturing costs were calculated with similarity theory use. This method uses exponents assigned to operations. This exponents were estimated for such operations like: facing, inner and outer...
Purpose: The study analysed influence of the selected functional properties of metallic biomaterials on selected functional properties of coronary stents used in invasive cardiology. Design/methodology/approach: Pitting corrosion resistance tests were performed by means of potentiodynamic method. Corrosion resistance tests were performed on the ground of registered anodic polarisation curves and Stern...
Purpose: The objective of the present work was to study the effect of the microstructural banding on the thermal anisotropy of hot-work tool steel used for die for aluminium alloy die-casting. In particular, the major purpose of this research was to find possible correlation between geometrically oriented thermal expansion coefficient values and the presence of number of parallel cracks on the working...
Purpose: In this paper stages of project management taking into consideration many useful tools and methods were presented. The quality management in the project, the risk estimation, costs of the project realization and many others were discussed. The analysis of project management of an element using in an automotive industry was carried out. Design/methodology/approach: In this article classification...
Purpose: The paper describes the preparation, structure and thermal properties of ternary Ca-Mg-Zn bulk metallic glass in form of as-cast rods. Design/methodology/approach: The investigations on the ternary Ca-Mg-Zn glassy rods were conducted by using X-ray diffraction (XRD), scanning electron microscopy (SEM) which energy dispersive X-ray analysis (EDS). Findings: The X-ray diffraction investigations...
Purpose: In this paper an evaluation of the most important components of human resources management (HRM) which have a significant impact on increasing of the competitiveness of the company was presented. The procedure of employment and qualification of employees, training, evaluation and dismissal of workers were showed. Design/methodology/approach: The implementation of the employees remuneration...
Purpose: The study analyses influence of surface modification of Si:Ti on physical and chemical properties of samples made from AISI 316L steel in solution simulating blood-vascular system. Design/methodology/approach: Sol-gel layer was selected on the ground of data from literature. TEOS and TET made the ground for initial solution. Application of the layer on the surface of samples made of AISI...
Purpose: Purpose of this paper is presentation of observations on different kinds of wear and tear of biomaterials used in contemporary orthopaedic surgery. Design/methodology/approach: Types of prosthesis damage, encountered in medical practice, and their causes have been described. Results of many clinical studies were analysed to review prosthesis damage from the stage of implanting (such as intrusion...
Purpose: Aim of the paper is to propose a new approach for the assessment of passive safety of gymnastic equipment that allows technicians to optimize the choice of protection devices. Design/methodology/approach: According to different standard procedures, EN 913 and EN 1177 with an additional control on the acceleration parameter, experimental tests on polymer foam materials were performed using...
Purpose: The aim of the work is a semi-industrial physical simulation of thermomechanical rolling and controlled cooling of advanced high-strength steels with increased Mn and Al content. Design/methodology/approach: Four steels of various Mn and Nb concentration were thermomechanically rolled in 3 and 5 passes using a modern LPS line for physical simulation of hot rolling at a semi-industrial scale...
Purpose: Recently, manufacturing industries have been concentrated on selection an optimal of welding parameter and condition that reduces the risk of mechanical failures on weld structures should be required in manufactory industry. In robotic GMA (Gas Metal Arc) welding process, heat and mass inputs are coupled and transferred by the weld arc to the molten weld pool and by the molten metal that...
Purpose: The objective of this work was to determine the influence of microstructure changes on GJS-HV300(SiNiCr2-3) cast iron tribological properties. Modification of the investigated cast iron microstructure was carried out by the heat treatment. Design/methodology/approach: The tribological tests were performed on the T05 tester at a load of 100 N. Bearing steel 100Cr6 of a hardness of 57 HRC was...
Purpose: Alloys on intermetallic phase matrix of iron and aluminium are considered the future materials for high-temperature applications as they are highly resistant to oxidation to temperature of 1100°C. The paper presents results of tests concerning kinetics of corrosion processes of alloy on intermetallic phase matrix FeAl type Fe40Al5CrTiB after vacuum casting and plastic treatment with the use...
Purpose: The article presents an analysis of impact energy dissipation process with selected non-classical dynamic models. Design/methodology/approach: Identification of impact energy dissipation phenomena in mechanical systems with a layered structure (eg. composite ballistic shields) is quite a challenge, because on the one hand it is sought to the model, whose parameters are as much as possible...
Purpose: The goal of the study is to try find the influence of the heat treatment on the corrosion resistance of two base cobalt alloys used on dental prosthesis. Design/methodology/approach: The investigation was choosen two base cobalt alloys: Remanium 2000+ (Dentaurum) and Wirobond LFC (Bego). Corrosion resistance test were carried out at room temperature and use of the Potentiostat IPS AJ PGU...
Purpose: Characteristics of functional properties of austenitic- based steels used for construction of boilers with supercritical and ultra-supercritical steam parameters. Design/methodology/approach: For selected austenitic steels in as-received state and after long-term annealing microstructural investigations were carried out with scanning and transmission electron microscope. Findings: Selected...
Purpose: This work focuses on the studies of chemical and physical changes induced by ArF-laser irradiation leading to formation of surfaces catalytically highly active and fully prepared for the direct electroless metallization for the case of thermoplastic and thermosetting polymer composites. The only pretreatment method for surface to be activated was laser irradiation. There are compared two...
Purpose: Tree Parity Machines are specific artificial neural networks used to construct relatively secure key exchange protocol [12,15,24]. The level of networks’ compatibility is measured by weight vectors mutual overlap. However, to calculate such mutual overlap, one needs to be familiar with both weights’ vectors, which is impossible in practical key exchange. This paper discusses other schemes...
Purpose: The current study utilizes the Taguchi design methodology to optimize the EDM processing parameters for the machining of A6061-T6 aluminum alloy. The experimental trials consider four EDM parameters, namely the pulse current (PC), the pulse-on duration (ON), the duty cycle (DC), and the machining duration (MD). Design/methodology/approach: The machined specimens are observed using the surface...
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