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Purpose: of this paper is to study the chip formation to obtain the optimal cutting conditions and to observe the different chip formation mechanisms. Analysis of machining of a hardened alloy, X160CrMoV12-1 (cold work steel: AISI D2 with a ferritic and cementite matrix and coarse primary carbides), showed that there are relationships between the chip geometry, cutting conditions and the different...
Purpose: The reason for this research is to test the intermetalic alloy with coatings Al2O3and AlCrN improved oxidation resistance in air at temperatures 950°C, typical for working conditions of highly loaded parts of gas turbine. Design/methodology/approach: The objectives were achieved using several techniques including conventional metallography, SEM, BSE, EDX and precision measurements of mass...
Purpose: The aim of the work is to investigate the microstructure of the heat treated and cold rolled commercial CuTi4 copper alloy. Design/methodology/approach: Observations an investigations of the structure were made on the JOEL transmission electron microscope (TEM), scanning electron microscope (SEM) Zeiss SUPRA 25 and diffractometer X’Pert Panalytical. Findings: Decomposition of supersaturated...
Purpose: The paper presents a structural relaxation process of Fe78Si9B13metallic glasses and structure and properties changes in a temperature range up to 300°C after annealing from 2 to 16 hours. Design/methodology/approach: The relaxation and crystallization of Fe78Si9B13metallic glasses were examined by mechanical test, relaxation test, scanning electron microscopy (SEM) and transmission electron...
Purpose: In paper the problem concerning inoculation of pure aluminum primary structure, which is realized by introducing into metal bath of specified substances, called inoculants is presented. Design/methodology/approach: In paper the influence of different inoculants introduced to metal bath in form of master alloy sort AlTi5, AlB3, AlTi5B1, AlTi5B3 and AlTi3C0.15 on refinement of primary structure...
Purpose: The aim of this study is to investigate the influence of accelerator-vulcanizing agent system and the vulcanization temperature on the properties of vulcanizates based on Natural rubber/Polybutadiene rubber (NR/ BR) compounds. This preliminary study will allow optimizing the composition for improving the mechanical properties and understanding the damage behaviour. Design/methodology/approach:...
Purpose: Variations of a flow stress vs. true strain illustrate behavior of material during plastic deformation. Stress-strain relationship is generally evaluated by a torsion, compression and tensile tests. Design/methodology/approach: Compression tests were carried out on precipitations hardenable nickel based superalloys of Inconel 718 and X750 at constant true strain rates of 10-4, 4x10-4, s-1...
Purpose: The paper presents a structural and magnetic characterization of selected Fe-based metallic glasses in as-cast state. Design/methodology/approach: The studies were performed on Fe(80-x)B20Nbxmetallic glasses in form of ribbons with Nb addition of 0, 4, 6, 10 at.%. The amorphous structure of tested samples was examined by X-ray diffraction (XRD) and Mossbauer spectroscopy methods. The Mossbauer...
Purpose The main purpose of the work is the description of the low-cycle fatigue process of mine powered roof supports working under mechanical high loading. The work focuses on the chosen component strain-stress characteristics. The issue of modelling the stress-strain behaviour of powered roof supports components during low-cycle fatigue has been discussed. Design/methodology/approach: The FEM modelling...
Purpose: The article examines the concept and the way to meeting the requirements implemented health and safety management system in industrial enterprise like Coking Plant. Based on analysis proposed improvements, which would aim to improve working conditions in the company. Design/methodology/approach: The proposed improvements are designed for specificity of work, production scale and nature of...
Purpose: of the current research is to develop a reliability assessment method with an extension of the existing ones and pooling them to a common framework. The system must identify the most unreliable parts of a production process and suggest the most efficient ways for the reliability improvement. Design/methodology/approach: FMEA is in the centre of the proposed framework,a reliability analysis...
Purpose: The purpose of the paper is to show and compare of modern method composite materials with aluminium alloy matrix reinforced by Ti(C,N) particles manufacturing. Design/methodology/approach: Powders of the starting materials were wet mixed in the laboratory vibratory ball mill to obtain the uniform distribution of the reinforcement particles in the matrix. The mixed powders were then dried...
Purpose: Automotive industry constantly demands high-strength steels which are characterized by the energy absorption possibilities during a collision. Such materials may, in the future, replace the currently used conventional steels. The groups of steels which meet these criteria are the austenitic steels and austenitic-ferritic steels with high manganese content (15-30%) and high aluminium content...
Purpose: This work presents the results of microstructure investigations which were carried out on Ni-base Rene 80 polycrystalline superalloy. Design/methodology/approach: Polycrystalline cast rods have been used in the studies. The heat treatment processes were conducted in ALD High Temperature Vacuum Furnace at 1204°C for 2 h, in Ar atmosphere followed by cooling to room temperature. The aluminizing...
Purpose: In this paper the results of high temperature cyclic oxidation tests of the protective diffusion coatings were presented. One of the main purposes of this work was to produce three different types of protective coatings by three different methods, i.e. slurry method, vapour phase aluminizing (VPA) and chemical vapour deposition (CVD), applied on nickel based Rene 80 superalloy substrate....
Purpose: The aim of the paper is to investigate the influence of plastic deformation and cooling conditions on a structure and a shape of CCT-diagrams of new-developed Nb-Ti-V microalloyed steel. Design/methodology/approach: The diagrams of undeformed and plastically-deformed supercooled austenite transformations for Nb-Ti-V microalloyed steel were determined. A part of the specimens were austenitized...
Purpose: Rapid solidification (RS) of metallic melts is important for the development of the advance metallic materials, because enables the production of new alloys with superior properties according to conventionally treated alloys. In practice it turned out, that single roll melt spinning process has one of the highest melt cooling rates among all continuous casting processes. But, because very...
Purpose: In this paper the occupational risk assessment in the selected work stations in the company which operates in the mining industry was carried out. The legal requirements relating to work safety and occupational risk assessment were showed. Design/methodology/approach: In this article three selected positions in the company were analysed and a comprehensive risk assessment was made for them...
Purpose: The aim of this work was to verify the usefulness of high-energy milling, using electromagnetic mill, as a method for obtaining tetragonal (red) form of PbO, alternative to standard methods. Design/methodology/approach: Experiments were held to compare samples of the yellow form of PbO after milling in electromagnetic mill with the ones milled in high-energy planetary ball mill as a function...
Purpose: This work presents methods of reduction of the vibration of mechanical systems by means of passive and active elements as well as examples of implementation of active reduction of vibration by means of electrical elements and mechanical elements in the form of kinematic excitation. Design/methodology/approach: This work also describes a structural and parametric synthesis, which can be defined...
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