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| 001 | 865857 | ||
| 005 | 20240711085644.0 | ||
| 020 | _ | _ | |a 978-3-95806-418-8 |
| 024 | 7 | _ | |a 2128/23298 |2 Handle |
| 037 | _ | _ | |a FZJ-2019-05145 |
| 041 | _ | _ | |a German |
| 100 | 1 | _ | |a Kalfhaus, Tobias |0 P:(DE-Juel1)169478 |b 0 |e Corresponding author |u fzj |
| 245 | _ | _ | |a Entwicklung von Reparaturmethoden für Nickel-Superlegierungen mittels thermischer Spritzverfahren |f - 2019-11-12 |
| 260 | _ | _ | |a Jülich |c 2019 |b Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag |
| 300 | _ | _ | |a VI, 126, XXX |
| 336 | 7 | _ | |a Output Types/Dissertation |2 DataCite |
| 336 | 7 | _ | |a Book |0 PUB:(DE-HGF)3 |2 PUB:(DE-HGF) |m book |
| 336 | 7 | _ | |a DISSERTATION |2 ORCID |
| 336 | 7 | _ | |a PHDTHESIS |2 BibTeX |
| 336 | 7 | _ | |a Thesis |0 2 |2 EndNote |
| 336 | 7 | _ | |a Dissertation / PhD Thesis |b phd |m phd |0 PUB:(DE-HGF)11 |s 1593416934_16069 |2 PUB:(DE-HGF) |
| 336 | 7 | _ | |a doctoralThesis |2 DRIVER |
| 490 | 0 | _ | |a Schriften des Forschungszentrums Jülich Reihe Energie & Umwelt / Energy & Environment |v 470 |
| 502 | _ | _ | |a Dissertation, Univ. Bochum, 2019 |c Univ. Bochum |b Dissertation |d 2019 |
| 520 | _ | _ | |a The outstanding high temperature properties of Ni-based superalloys are the reason for their application in modern gas turbines. The development towards a singlecrystalline microstructure lead to a significant increase in efficiency over the past decades. Repair procedures with the potential to reduce the overall cost of these expensive components are of special interest for the gas-turbine industry. The highquality standards and the poor weldability of Ni-based superalloys limit conventional repair procedures. Thermal spray techniques are a promising method for repair applications due to their outstanding coating properties. This thesis is engaged with the potential for a possible repair application of Ni-base superalloys using vacuum plasma spray (VPS) and cold gas spray (CGS). A focus of this thesis is on the single crystalline repair of the alloy CMSX-4. A precise measurement and control of the substrate temperature during both spray techniques is important to influence the microstructural properties of the coating. Therefore, a heated substrate holder with a maximum substrate temperature of 1000 °C was constructed and build. The first part of the thesis considers the influence of an increased substrate temperature on the VPS-coatings. An epitaxial crystal growth of the polycrystalline repair coating is observed in sections on the polished single-crystalline substrate. A parameter study was used to decrease the oxide content within the coatings. The specific movement of the polycrystalline repair coatings into a hot-zone leads to directional annealing, resulting in a columnar microstructure. With the aim of stimulating grain growth from the SX substrate, a FEM-thermal-field evolution of a Bridgman furnace was simulated. The results indicate conditions within the sample to be adequate to allow hot-zone movement through a thick polycrystalline VPS-repair coating originating in the SX-substrate. In the second part of the thesis it is shown that the maximum gas temperature of the CGS-system is not sufficient to deposit CMSX-4. Therefore, the focus for CGS-repair was changed to the polycrystalline repair of IN-738 using the four alloys IN-625, IN-713, IN-738 and Rene’80. The residual stress of the coatings is characterised using a hole-drill and a curvature approach. To improve the coating thickness the elastic stored energy of the coatings is reduced using the heated sample holder and laser structuring results in a better adhesion between the substrate and the coating.It was found that subsequent HIP-heat-treatments decrease the porosity with an increasing annealing temperature. The strongly deformed microstructure of the CGScoatings attached to aged substrate can be rejuvenated with HIP-heat-treatments atoptimized annealing temperatures. Simulated Stress-Strain-Curves using Indentation data revealed similar strength properties of the IN-738-repair coating in comparison to the IN-738-substrate. |
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| 856 | 4 | _ | |u https://juser.fz-juelich.de/record/865857/files/Energie_Umwelt_470.pdf |y OpenAccess |
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| 910 | 1 | _ | |a Forschungszentrum Jülich |0 I:(DE-588b)5008462-8 |k FZJ |b 0 |6 P:(DE-Juel1)169478 |
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| 914 | 1 | _ | |y 2019 |
| 915 | _ | _ | |a OpenAccess |0 StatID:(DE-HGF)0510 |2 StatID |
| 915 | _ | _ | |a Creative Commons Attribution CC BY 4.0 |0 LIC:(DE-HGF)CCBY4 |2 HGFVOC |
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| 981 | _ | _ | |a I:(DE-Juel1)IMD-2-20101013 |
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