|
|
Microstructural stability of materials prepared by aditive manufacturing methods
Hyspecký, Michal ; Pantělejev, Libor (referee) ; Štěpánek, Roman (advisor)
This work deals with the microstructural thermal stability of material 2618 produced by the Selective Laser Melting metho - SLM. Microstructural stability is compared with the stability of material produced by conventional methods. Stability itself is evaluated by changes of microstructure and microhardness. The main finding is that the sample produced by SLM method reached a microhardness of 125 HV 0.3 and after sixteen hours of annealing at 200 °C a decrease of only a few units to 120 HV 0.3 was recorded. Based on the data obtained, it was concluded that the sample produced by SLM method is structurally stable, as it did not occur any significant changes in the microstructure or in the observed mechanical properties. As a result, components produced by SLM method become usable in operation in places with an elevated temperature up to 200 °C (with a given choice of criteria).
|
|
|
Mechanical-structural characteristics of multi-materials prepared by additive technologies
Hyspecký, Michal ; Válka, Libor (referee) ; Pantělejev, Libor (advisor)
The diploma thesis deals with the mechanical-structural characteristics of the multimaterial interface prepared by the additive cold-spray (CS) technology. In the experimental part of the work, the titanium alloy Grade 23 was applied to the surface of aluminum alloy EN AW 2618, after heat treatment T6. Furthermore, a separate bulky block made of Grade 23 alloys for the production of tensile bodies was created using the CS method. The sprays were evaluated in two planes perpendicular to each other, respectively in longitudinal and transverse section. The average porosity of the coatings was evaluated at 2,6 ± 0,6%. The hardness value at low load did not change significantly with increasing distance from the interface and the mean value was 347 ± 51 HV 0,3. The tensile test did not show a significant effect of the sample orientation on the resulting value of the yield strength, which had the diameter of 345 ± 12 MPa. Successful deposition takes place at the temperature of 1010 ° C and the pressure of 5 MPa. The achieved results of the mechanical properties of the coating determined on the basis of tensile tests are at a relatively good level. Therefore, it is possible to consider the use of coating by this method, under given conditions, for rotating components operating at elevated temperatures, and increase their efficiency or service life.
|
|
|
Mechanical-structural characteristics of multi-materials prepared by additive technologies
Hyspecký, Michal ; Válka, Libor (referee) ; Pantělejev, Libor (advisor)
The diploma thesis deals with the mechanical-structural characteristics of the multimaterial interface prepared by the additive cold-spray (CS) technology. In the experimental part of the work, the titanium alloy Grade 23 was applied to the surface of aluminum alloy EN AW 2618, after heat treatment T6. Furthermore, a separate bulky block made of Grade 23 alloys for the production of tensile bodies was created using the CS method. The sprays were evaluated in two planes perpendicular to each other, respectively in longitudinal and transverse section. The average porosity of the coatings was evaluated at 2,6 ± 0,6%. The hardness value at low load did not change significantly with increasing distance from the interface and the mean value was 347 ± 51 HV 0,3. The tensile test did not show a significant effect of the sample orientation on the resulting value of the yield strength, which had the diameter of 345 ± 12 MPa. Successful deposition takes place at the temperature of 1010 ° C and the pressure of 5 MPa. The achieved results of the mechanical properties of the coating determined on the basis of tensile tests are at a relatively good level. Therefore, it is possible to consider the use of coating by this method, under given conditions, for rotating components operating at elevated temperatures, and increase their efficiency or service life.
|
|
|
Microstructural stability of materials prepared by aditive manufacturing methods
Hyspecký, Michal ; Pantělejev, Libor (referee) ; Štěpánek, Roman (advisor)
This work deals with the microstructural thermal stability of material 2618 produced by the Selective Laser Melting metho - SLM. Microstructural stability is compared with the stability of material produced by conventional methods. Stability itself is evaluated by changes of microstructure and microhardness. The main finding is that the sample produced by SLM method reached a microhardness of 125 HV 0.3 and after sixteen hours of annealing at 200 °C a decrease of only a few units to 120 HV 0.3 was recorded. Based on the data obtained, it was concluded that the sample produced by SLM method is structurally stable, as it did not occur any significant changes in the microstructure or in the observed mechanical properties. As a result, components produced by SLM method become usable in operation in places with an elevated temperature up to 200 °C (with a given choice of criteria).
|
guest ::
