PSI - Issue 25

ScienceDirect Available online at www.sciencedirect.co ci c ir ct Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 25 (2020) 79–87

1st Virtual Conference on Structural Integrity - VCSI1 Production issues in the manufacturing of TiAl turbine blades by investment casting 1st irtual onference on Structural Integrity - SI1 r ti iss s i t f t ri f i l t r i l s

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A.Brotzu 1 , F.Felli 1 , A.Mondal* 1 , D.Pilone 1 . rotzu 1 , . elli 1 , .Mondal* 1 , . ilone 1

Dipartimento ICMA, Sapienza Università di Roma, Via Eudossiana 18, 00184 Roma, Italy Dipartimento ICMA, Sapienza Università di Roma, Via Eudossiana 18, 00184 Roma, Italy

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the VCSI1 organizers Over the years, several complex manufacturing methods have been used for producing TiAl parts. In this work TiAl blades have been produced by means of investment casting. The work analyses the different production steps: design of a blade prototype, production of an ABS model by additive manufacturing that is used to make the wax model, preparation of the ceramic mold and centrifugal casting of the component. All the production issues related to TiAl alloy investment casting have been analyzed with the aim of setting up a tailored process able to produce sound components. © 0 The Authors. Published by Elsevier B.V. T is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the VCSI1 organizers Keywords: Intermetallics; investment casting; TiAl alloys; TiAl manufacturing. Introduction Titanium Aluminides have been a major topic of research for more than fifty years and still remain a hot research topic (Clemens et al. (2011), Thomas et a. (2011), Sheng et al. (2000), Kim et al. (2008), Kim (1995)). The first phase of the research focused on the evaluation of the various alloy compositions and on their effect on mechanical properties such as toughness and creep resistance. To increase high temperature properties as well as ductility and Abstract γ -TiAl based intermetallic alloys have attracted broad attention as a potential candidate for high-temperature structural applications. A careful selection of their composition and microstructure allows to obtain an interesting combination of oxidation resistance, creep resistance and high temperature strength for specific applications. Over the years, several complex manufacturing methods have been used for producing TiAl parts. In this work TiAl blades have been produced by means of investment casting. The work analyses the different production steps: design of a blade prototype, production of an ABS model by additive manufacturing that is used to make the wax model, preparation of the ceramic mold and centrifugal casting of the component. All the production issues related to TiAl alloy investment casting have been analyzed with the aim of setting up a tailored process able to produce sound components. © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the VCSI1 organizers Keywords: Intermetallics; investment casting; TiAl alloys; TiAl manufacturing. 1. Introduction Titaniu lu inides have been a ajor topic of research for ore than fifty years and still re ain a hot research topic (Cle ens et al. (2011), Tho as et a. (2011), Sheng et al. (2000), i et al. (2008), i (1995)). The first phase of the research focused on the evaluation of the various alloy co positions and on their effect on echanical properties such as toughness and creep resistance. To increase high te perature properties as ell as ductility and Abstract γ -TiAl based intermetallic alloys have attracted broad attention as a potential candidate for high-temperature structural applications. A careful selection of their composition and microstructure allows to obtain an interesting combination of oxidation resistance, creep resistance and high temperature strength for specific applications. 1.

* Corresponding author. E-mail address: avishek.mondal@uniroma1.it. * Corresponding author. E-mail address: avishek.mondal uniroma1.it.

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the VCSI1 organizers 2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the VCSI1 organizers

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the VCSI1 organizers 10.1016/j.prostr.2020.04.012