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Search Results: 1 - 10 of 297485 matches for " J. Suchoń "
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Stereological parameters of carbides on section of casting made from modified chromium cast iron
A. Studnicki,J. Suchoń
Archives of Foundry Engineering , 2011,
Abstract: The analysis of stereological parameters of carbides on the section of the model castingmade from modified (the mixture FeNb+FeV+RE) wear resistance chromium cast iron was introduced in the article. The jump change of some stereological parameters of carbides in certain distance from the surface of the casting was observed.
Structure of low-alloy constructional cast steel - a quantitative analysis of impurities
D. Bartocha,J. Suchoń
Archives of Foundry Engineering , 2011,
Abstract: The mechanical properties of cast steel are primarily a function of chemical composition and solidification conditions i.e. primary structure, however, a significant role also plays its quality understood as purity metallurgical i.e. as small as possible content of harmful components of the structure. In work the results of porosity and non-metallic inclusions in steel cast structure quantity analysis are presented.A function which coefficient can be treated as parameters of unwontedstructurecomponent was statistically fittedto histograms of impurities distribution. The influence of O, N, P and S content on approximation function coefficients was analyzed.
The influence of chosen modifiers on stereological parameters of carbides of chromium cast iron
A. Studnicki,J. Suchoń
Archives of Foundry Engineering , 2011,
Abstract: The results of investigations of stereological carbides in the modified wear resistance chromium cast iron resistant were introduced in the article. There were following elements: boron, niobium, vanadium, cerium and lanthanum (RE), nitrogen in the composition of modifiers. The influence of used modifiers on such stereological parameters of carbides as: size, perimeter, shape coefficient and volume fraction was showed in tables and on diagrams.
Influence of pouring temperature on a thermal gradient
J. Suchoń,M. Cholewa
Archives of Foundry Engineering , 2010,
Abstract: In the thesis there are presented results of computer simulation of casting solidification process, characteristics of solidification rate in several points as well as course of gradient change between these points. Based on the obtained results, an influence of initial conditions on temperature gradient during the solidification process was determined.
Hard coal modified with silanes as polyamide filler
M. Rojek,J. Stabik,?. Suchoń
Journal of Achievements in Materials and Manufacturing Engineering , 2010,
Abstract: Purpose: This paper shows the influence of coupling agents, especially silanes, on mechanical properties of polyamide 6 filled with hard coal dust.Design/methodology/approach: Before preparing compositions, pulverised filler surface was modified with coupling agents. Then, it was compounded using a twin-screw extruder composite consisting of modified hard coal and polyamide 6. A blend was granulated later and test samples were subjected to injection moulding. Afterwards, mechanical properties were evaluated. These properties have essential meaning for applications of new composites as structural materials.Findings: Tests demonstrated that modification of powdered hard coal surface with coupling agents had not significant effect on mechanical properties of polyamide/hard coal composites.Research limitations/implications: Applied compounding procedure did not allow to achieve good compositions homogenisation. A new method to be applied is planned in future research. Simultaneously, it is necessary to investigate composites with other coupling agents which will improve filler’s adhesion to a polymer. Long-term test are also planned.Practical implications: Hard coal, cheap and widely available filler, used to modify thermoplastic polymers, enable to obtain new materials with attractive properties and many applications.Originality/value: Paper represents innovative polymer filler and methods to modify it.
Developing of chromium cast steel on sleeves of heavy machines
J. Kilarski,A. Studnicki,J. Suchoń
Archives of Foundry Engineering , 2010,
Abstract: The results of investigations of hardness, impact resistance, abrasive and corrosive wear of selected chromium cast steel with destination on sleeves of heavy machines were introduced in the article. First results of exploational investigations talked over on the end.
Stereology of carbide phase in modified hypereutectic chromium cast iron
J. Suchoń,A. Studnicki,M. Przyby?
Archives of Foundry Engineering , 2010,
Abstract: In paper are presented results of studies of carbide phase stereology modified hypereutectic wear resistance chromium cast iron which contains carbon about 3,5% and chromium about 25%. Three substances were applied to the modification: boron carbide (B4C), ferroniobium (FeNb) and mixture of ferroniobium and rare-earth (RE). The measurements of geometrical features of carbides were conducted on microsection taken from castings wich were cooled with various velocities.
Studies of the transition zone in steel – chromium cast iron bimetallic casting
S. Tenerowicz,J. Suchoń,M. Cholewa
Archives of Foundry Engineering , 2010,
Abstract: In this work authors presented the results of transition zone studies on steel – cast iron interface in bimetallic casting. During the investigations cylindrical castings with different diameter were prepared of cast iron with steel rods placed in the center. From each bimetallic casting a microsection was prepared for microhardness tests and metalographic analysis, consisting of transition zone measurement, point and linear analysis as well as quantitative analysis.
Examples of thermal derivative gradient analysis (TDGA) application
M. Cholewa,J. Suchoń,M. Kondracki
Archives of Foundry Engineering , 2009,
Abstract: The study presents the possibility of TDGA method based on multipoint measurement of temperature during crystallization of two test castings poured from different temperature. Sample castings have conical shape. Temperature measurement is carried out in six cone cross-sections between the heat axis and the surface of the mould cavity. The multichannel recording device allows describing the thermal derivative after time and direction. Presented examples of the assessment of kinetics of crystallization for alloys: AlSi11, CuSn8 and GJL 200 cast iron. Based on quantitative analysis of the microstructure (DAS, fig. 1 and tab.1) examples of relations were prepared, describing the mechanical and structural properties in function of crystallization kinetics parameters - DAS = f(vch ) DAS = f(Δ(dT/dt)/dt) HV = f(Gy) Rm = f(Δ(dT/dt)/dt) as shown in fig. 2 and 4. The evaluation of crystallization process was also conducted for AlSi11 skeleton castings. Pointed out was the universality of the method with respect to the mathematical interpretation of the results and its limitations due to data registration extracted from multiple thermocouples. Based on the conducted studies, the method can be applied in the industry as well as in the experimental practice.
Research on polyamide matrix composites filled with hard coal
M. Rojek,J. Stabik,M. Szymiczek,?. Suchoń
Archives of Materials Science and Engineering , 2012,
Abstract: Purpose: The aim of this paper is to present the summary results of studies on polyamide composites filled with hard coal. Research on the use of coal as a filler of polymers are conducted for many years in Division of Metallic and Polymeric Materials Processing, Silesian University of Technology. This paper summarizes results obtained in different research programmes preformed in recent years. Described materials are polyamide 6 composites filled with modified and unmodified hard coal powder.Design/methodology/approach: All the resulting compositions intended for research have been produced using twin screw extruder. The resulting mixtures of various compositions were then subjected to a process of granulation. The prepared composites have undergone a process of injection moulding which allowed to obtain samples for strength tests. Full statement of research results obtained for composites could help to predict the material with the best mechanical properties and hence the best material for construction.Findings: It has appeared from studies that in both a composite made of unmodified coal and of coal modified with coupling agents show a decrease in mechanical properties in comparison with the neat polymer. Apart from this these composites are interesting materials because of low prize of the filler.Research limitations/implications: It can be concluded from research that all types of obtained composites are characterized by a decrease in mechanical properties.Practical implications: Applications of hard coal as a filler of polymer composites is way to produce new materials. It is worth noting that the main features of the filler used is its prevalence, low cost and electrical conductance.Originality/value: The results describe new fillers of thermoplastic polymers and the possibility of its modification.
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