This work deals with the issue of defects generation during the separation of the castings from a nickel-based superalloy, Inconel 738LC. The technology of investment casting is presented, followed by a description of metallurgy of superalloys, their physical and mechanical properties, as well as their technical applications. The machinability of superalloys and method of castings separation were also described as well as some of the casting defects that were reported to have impact on the generation of the defects after cutting. In the experimental part, the material microstructure and casting defects were analyzed. The experimental machining part consisted first of a comparative study of the friction sawing and plasma arc cutting technology at the standard operating conditions actually used in production. Second, an optimization study for the friction sawing was carried out, with a special focus on the suitability of an alternative cutoff wheel for the chosen application. Application of this wheel allows reducing the security distance between the cut and the part, thus reducing the production cost of the part.
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:256567 |
| Date | January 2016 |
| Creators | Metelková, Jitka |
| Contributors | Sliwková, Petra, Píška, Miroslav |
| Publisher | Vysoké učení technické v Brně. Fakulta strojního inženýrství |
| Source Sets | Czech ETDs |
| Language | Czech |
| Detected Language | English |
| Type | info:eu-repo/semantics/masterThesis |
| Rights | info:eu-repo/semantics/restrictedAccess |
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