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Department of Materials Engineering and Production §Ystems Lodzuniversity of Technology * Sumrnary of seiontific achievements Tomłsz Sąrmcz*I! PhD. Eng. , Department of Materials Engineering ' and Production §ystems LodzUniversity of Technology * Ann€x 2 Tońasż Szymczak Contents 1. Name: 3 2. Diplomas and degree§ .............. 3 ł J. Employment in scientific institutions......... ...............3 4. A scientific achievement pursuant to Ań. 16 par.2 of the act14 March 2003 on Academic Degrees and §cientific Titles and I)egrees and Titles in the Field of Arts (Journal of Laws, 20l7,item 1789): ......4 a) Title of scientific achievement......... ................4 b) Discussion of scientific achievements..........,...... ...............5 c) Description of scientific achievement application. ...........15 5. Teaching activity .............2L Important scientific indicators: ...........23 .......24 'i Annex 2 Tomasz Szymczak 1. Name: Tomasz Szymczak 2. Diplomas and degrees 22.06.2007 Doctor of Philosophy in Materials Engineering. PhD thesis: ,rThe model of the coat growth on iron alloys obtaining by immersion in the Al-Si bath and its connection with multi-component silumin", Lodz University of Technology, Faculty of Mechanical Engineering Dissertation advisor: Prof. Stanisław Pietrowski, Lodz University of Technology. Reviewer: Prof. Edward Guzik, AGH University of Science and Technology in Krakow. Reviewer: Prof. Piotr Kula, Lodz University of Technology. 22.02.2002 Master of Science. Engineer of Mechanical Engineering M.Sc. thesis: ,rComparative analysis of the manufacturing costs of the ventilated brake disk with various casting technologies" Lodz University of Technology, Faculty of Mechanical Engineering Dissertation advisors : Prof. Andrzej Jopkiewicz 3. Employment in scientific institutions 2007 - Lodz University of Technology, Department of Materials Engineering and Production Systems - assistant professor. Annex 2 Tomasz Szymczak 4. A scientific achievement pursuant to Art. 16 par,2 of the act14 March 2oo3 on Academic Degrees and Scientific Titles and Degrees and Titles in the Field of Arts (Journal of Laws, 20|7,item 1789): a) Title of scientific achievement As "a scientific achievement made after receiving the doctor's degree which constitutes the author's significant contribution into the development of a specific scientific field" I point to the monograph and a series of three publications under the same title: Hypoeutectic silumins with the addition of Cr, Mo, V and Wfor the casting under high pressure of machine parts with increased mechanical properties Bl. Szymczak T., Monograph: The ffict of Cr, Mo, V and W on the crystallization process and mechanical properties of hypoeutectic Al-Si alloys, Lodz University of Technology Publishing House, 2019. and a series publications: B2. Szymczak T., Szymszal J., Gumienny G.: ,,Statistical methods used in the assessment of the influence of the Al-Si alloy's chemical composition on its propeńies", Archives of Foundry Engineering, Volume 18, Issue l (2018)203-21l. 83. Szymczak T., Szlłnszal J., Gumienny G.: ,,Evaluation of the effect of the Cr, Mo, V and W content in an Al-Si alloy used for pressure casting on its proof stress", Archives of FoundryEngineering, Volume 18,Issue 2(2018) 105-1l1. B4. Szymczak T., Szymszal J., Gumienny G.: ,,Evaluation of the effect of Cr, Mo, V and W on the selected properties of silumins", Archives of Foundry Engineering, Volume 18,Issue 4 (2018) 77-82. Annex 2 Tomasz Szymczak b) Discussion of scientific achievements Aluminium is an element widely used in the foundry industry. In foundry engineering, this element is used as a construction material. Due to the relatively low mechanical properties of pure aluminium, mainly alloys made on its basis are used in the foundry industry. In recent years, after iron alloys, aluminium alloys have been the most often used group of alloys for the production of castings [1-8]. There is also an increased interest in Al alloys, which is reflected in the increasing global production of aluminium alloy castings in recent yeafs. The quantity of aluminium alloys processed in the foundry industry increased from 10.2 million tons in 2009 to 17.9 million tons in2016. During this period, the share of the production of castings from these alloys also increased in the global production of castings, from 12.7Yoto 17.Ioń. The high interest shown in Al alloys results in the necessity to undertake research aimed at maximising their development and extending the scope of application in various areas of processing and industry. Silumin is one of the most popular A1 alloys used in the foundry indusĘ. It's an aluminium-silicon alloy, which may also contain alloy additives. Silumins feature good castability, resistance to corrosion, machinability, heat resistance, electrical and thermal conductivity, low density (p = Z.l el"Ń), thermal expansion as well as a small casting shrinkage. They also have high strength properties in the group of low density alloys. Thanks to these properties, silumins have found a wide range of applications, especially in the automotive, aerospace and electrical machinery industry, as well as in the manufacture of household appliances. A problematic feature of silumin is the abili§ to form a coafse microstructure in it with relatively slow heat dissipation from the casting. For this reason, these alloys are generally not used for casting in sand and ceramic moulds. For this reason, it is best to use technologies in which metal moulds are used for casting silumin. Such technologies include die casting and pressure casting. Due to the relatively small thickness of the walls of pressure castings (s ś6 mm), this technology is characterised by very intense heat removal from the casting. For this reason, silumins after casting under pressure have significantly higher values of tensile strength R., proof stress Rpo.z and slightly higher HBW hardness compared with silumins cast into sand moulds, as well as die moulds. The fragmentation of the silumin microstructures, and thus the increase of their strength properties, can also be obtained due to their modification. The broadly understood properties of silumin can also be irqproved by incorporating alloy additions. Commonly used additions Annex 2 Tomasz Szymczak to silumin allow for carrying out heat treatment called precipitation hardening (e.g. Mg and Cu), increasing corrosion resistance (e.g. Ni) and strengthening solid solutions (e.g. Zn). Both the precipitation hardening, the strengthening of solid solutions and the modification have the greatest impact on increasing the strength properties of silumin. A special group of additives that can be introduced into silumin are so-called high-melting elements, such as Cr, Mo, V and W. The equilibrium systems Al-Cr [9], Al-Mo [10], Al-V I11, 12] and Al-W [11,13] show that the analysed high-melting elements have a lack of solubility or insignificant solubility in aluminium in the solid state. As a consequence, many intermetallic phases crystallize in these systems. High-melting elements (Cr, Mo, V and W) form numerous intermetallic phases also in double equilibrium systems with silicon [II,14-17l. The analysis of two-component equilibrium systems Cr-Mo, Cr-V, Cr-W, Mo-V, Mo-W and VW [l1, 18- 22] shows the mutual unlimited solubility of these elements or the formation of solid solutions. The data presented above indicates that the potential intermetallic phases, which may be formed in silumin after the addition of Cr, Mo, V and W additives, will crystallize in systems with Al or Si. In multi-component silumins, we have to take into account the possibility of creating more complex phases containing components other than those analysed. The intermetallic phases can significantly increase the brittleness of A1 alloys and reduce their strength and plastic properties. The danger of separation of intermetallic phases in silumins containing Cr, Mo, V and W increases with the decreasing rate of heat dissipation from the crystallized casting. The high rate of heat removal from the casting to the pressure mould makes it possible to supersaturate solid silumin solutions with these additives. This should lead to strengthening solid solutions of silumin and, consequently, improving its strength properties. Therefore, the addition of Cr, Mo, V and W to silumin intended for pressure casting seems to be the most favourable. Papers [Bl-B4], constituting the described scientific achievement, are devoted to the introduction of these additives to silumins casts under pressure in order to increase their mechanical properties. The analysis of the current state of knowledge presented in the monograph [B1] shows the small number of research papers on the use of Cr, Mo, V and W additives to silumin. This knowledge indicates two main goals for introducing these additives to silumin. They are: strengthening the effect of precipitation strengthening and reducing the harmful influence of iron on the properties of silumin. It has been shown that the addition of Cr, Mo or V into the silumin cast into die moulds can enhance the effect of precipitation strengthening, resulting in Annex 2 Tomasz Szymczak an increase in the mechanical properties of silumin at both ambient and elevated temperatures. Chromium and molybdenum appear to be the most effęctivę in this area. The effectiveness in reducing the harmful effect of iron on the mechanical propeńies of silumin is demonstrated by all high-melting additives tested. The iron causes the formation of the B-Al5FeSi intermetallic phase with plate morphology in the silumin microstructure. This phase significantly increases the brittleness of the alloy. The Cr, Mo, V or W introduced into silumin causes a decrease in the size of precipitates of this phase or crystallization, instead of a phase with plate morphology, of other phases having a morphology considered less harmful. The addition of Cr, Mo, V or W to silumin can cause the crystallization of intermetallic phases in the Al-Fe- Si-X system, where X means any high- melting addition tested. In silumins containing manganese, this element also enters the described phase. This phase may have divęrse morphology: "Chinese script", block, polygon, star or dendritic morphology.
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