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The Structure and Properties of Austenitic Steel Prepared by the Cold Spray Method and Selected Laser Melting Technology
Osička, Filip ; Šmíd, Miroslav (referee) ; Hutařová, Simona (advisor)
This bachelor's thesis focuses on the comparison of two different technologies, specifically Cold Spray (CS) and Selective Laser Melting (SLM), and their effects on the properties of austenitic unstabilized stainless steel AISI 304L. The difference between these technologies is determined by the difference in their physical principles and thus their different practical applications. The theoretical part of the thesis describes in detail the principles of CS and SLM technologies applied to stainless steel. The experimental part describes the procedures for evaluating samples that were created using CS and SLM technologies, with each sample being produced under different process parameters. The analysis included not only the samples prepared by these methods but also the input material in its original state. The microstructure of the produced materials was extensively examined under a light and scanning electron microscope. Furthermore, porosity, microhardness, and flexural strength were determined. The results of the individual measurements are compared and subsequently discussed in the context of the available scientific literature.
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Optimizing the Properties of the Coatings prepared by the Cold Spray Method using Heat Treatment
Bartošík, Vojtěch ; Šmíd, Miroslav (referee) ; Hutařová, Simona (advisor)
This bachelor's thesis deals with the choice of heat treatment parameters of the metal coating of austenitic unstabilized stainless steel AISI 304L applied by the Cold spray method. With the help of suitable heat treatment, it is possible to adjust the mechanical properties, reduce the porosity and, last but not least, also remove high residual stresses in the material. The theoretical part of the work is devoted to literature research on the topic of Cold spray technology, corrosion and corrosion-resistant steels. The experimental part describes the procedures for measuring samples that have undergone heat treatment. This took place in the temperature range of 500 to 1100 °C, always with an hour's holding time at the temperature, followed by cooling in air. In addition to these samples, the material was also examined in its initial state. Porosity, microhardness and also magnetism were determined. To analyze the structure, photographs were taken on a light and electron scanning microscope. Based on the results, heat treatment with an hourly hold at 700 °C seems to be a good choice, where a significant decrease in porosity, partial recovery of the structure while maintaining high microhardness and also grain fineness was observed.
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Optimizing the Properties of the Coatings prepared by the Cold Spray Method using Heat Treatment
Bartošík, Vojtěch ; Šmíd, Miroslav (referee) ; Hutařová, Simona (advisor)
This bachelor's thesis deals with the choice of heat treatment parameters of the metal coating of austenitic unstabilized stainless steel AISI 304L applied by the Cold spray method. With the help of suitable heat treatment, it is possible to adjust the mechanical properties, reduce the porosity and, last but not least, also remove high residual stresses in the material. The theoretical part of the work is devoted to literature research on the topic of Cold spray technology, corrosion and corrosion-resistant steels. The experimental part describes the procedures for measuring samples that have undergone heat treatment. This took place in the temperature range of 500 to 1100 °C, always with an hour's holding time at the temperature, followed by cooling in air. In addition to these samples, the material was also examined in its initial state. Porosity, microhardness and also magnetism were determined. To analyze the structure, photographs were taken on a light and electron scanning microscope. Based on the results, heat treatment with an hourly hold at 700 °C seems to be a good choice, where a significant decrease in porosity, partial recovery of the structure while maintaining high microhardness and also grain fineness was observed.
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