|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||GAT-2017 (Gamma Alloys Technology - 2017)
||Repair of γ-TiAl Turbine Blades by Use of Laser Additive Manufacturing
||Silja-Katharina Rittinghaus, Andreas Weisheit, Michael Mathes
|On-Site Speaker (Planned)
Powder based laser metal deposition (LMD) is an established additive manufacturing technique used for repair of high value parts, e.g. blades made of nickel or titanium alloys. Intermetallic γ-TiAl based alloys are a modern class of materials which have found first applications as low pressure turbine blades. However, so far there is no repair technology established for this alloy class. The challenge for this is very high, since TiAl is extremely brittle and prone to oxygen pick-up. In the present work, laser metal deposition is investigated for the technical alloys TNM-B1 and GE4822. A suitable machine setup, processing strategy and parameters for crack free near-net-shape repair are identified. Post-heat treatment is performed and microstructural as well as mechanical properties (tensile strength, creep) are investigated and discussed. The results show that LMD can also fit well into an automatized process chain to restore damaged and worn turbine γ-TiAl blades.
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