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Surface coatings of medium and high entropy alloy prepared by the cold-spray method
Vražina, Tomáš ; Adam, Ondřej (referee) ; Moravčík, Igor (advisor)
This bachelor thesis investigated coating of the CoCrNi (Medium entropy) alloy deposed onto austenitic steel substrate. The main objectives were characterization and analysis of sprayed deposition before and after heat treatment. The thesis was divided into 2 main parts. The theoretical part provided general information about alloy manufacturing, properties, and the method of its consolidation. The experimental part provided electron microscopy analysis including, an EDS, a porosity analysis and microhardness testing. Its results were then discussed on the base of the information gathered in the theoretical part. The results showed that the deposed layer was stable and there was no sign of material decohesion. The coating showed low porosity which was later successfully lowered by heat treatment. EDS proved that the coating was not entirely homogenous. The conclusion summarized the results achieved in the practical part.
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Repairs of high-strength steels using Cold Spray technology
Krvač, Matěj ; Foret, Rudolf (referee) ; Řehořek, Lukáš (advisor)
This diploma thesis takes into account the possibility of repairing high-strength steels using coldspray method. The theoretical part is focused on the coldspray method, austenite transformation, bainitic steels and Rmat contact fatigue tests. In the experimental part evaluate the hardness, the structure of the supplied substrate. The hardness, adhesion and porosity of the test sprays are ranked. Furthermore, tests for contact fatigue are evaluated. Finally, the results of the experiments are summarized and measures are proposed to improve adhesion, or to continue this issue.
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Repairs of high-strength steels using Cold Spray technology
Krvač, Matěj ; Foret, Rudolf (referee) ; Řehořek, Lukáš (advisor)
This diploma thesis takes into account the possibility of repairing high-strength steels using coldspray method. The theoretical part is focused on the coldspray method, austenite transformation, bainitic steels and Rmat contact fatigue tests. In the experimental part evaluate the hardness, the structure of the supplied substrate. The hardness, adhesion and porosity of the test sprays are ranked. Furthermore, tests for contact fatigue are evaluated. Finally, the results of the experiments are summarized and measures are proposed to improve adhesion, or to continue this issue.
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Surface coatings of medium and high entropy alloy prepared by the cold-spray method
Vražina, Tomáš ; Adam, Ondřej (referee) ; Moravčík, Igor (advisor)
This bachelor thesis investigated coating of the CoCrNi (Medium entropy) alloy deposed onto austenitic steel substrate. The main objectives were characterization and analysis of sprayed deposition before and after heat treatment. The thesis was divided into 2 main parts. The theoretical part provided general information about alloy manufacturing, properties, and the method of its consolidation. The experimental part provided electron microscopy analysis including, an EDS, a porosity analysis and microhardness testing. Its results were then discussed on the base of the information gathered in the theoretical part. The results showed that the deposed layer was stable and there was no sign of material decohesion. The coating showed low porosity which was later successfully lowered by heat treatment. EDS proved that the coating was not entirely homogenous. The conclusion summarized the results achieved in the practical part.
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