Selective electron beam melting of the single crystalline nickel-base superalloy CMSX-4®: From columnar grains to a single crystal

Beitrag bei einer Tagung
(Konferenzbeitrag)


Details zur Publikation

Autor(en): Körner C, Ramsperger M
Herausgeber: M. Hardy, E. Huron, U. Glatzel, B. Griffin, B. Lewis, C. Rae, V. Seetharaman, S. Tin
Verlag: Minerals, Metals and Materials Society
Jahr der Veröffentlichung: 2016
Tagungsband: Superalloys 2016: Proceedings of the 13th Intenational Symposium of Superalloys
Seitenbereich: 341-349
ISBN: 9781118996669
Sprache: Englisch


Abstract


Selective electron beam melting (SEBM) is a powder-bed-based additive manufacturing technology. SEBM offers a great potential to process high performance alloys like intermetallics, e.g. TiAl or FeAl, and Ni-based superalloys, which are hard or non weldable materials with high susceptibility to crack-formation. Especially the high process temperatures during SEBM are beneficial for reducing stresses and warpage. In addition, SEBM works under vacuum which guarantees a perfect protection against contamination. In this contribution, SEBM of the single crystalline nickel-base superalloy CMSX-4®1 is investigated. It is shown that crack formation can be avoided by appropriate processing conditions. Regarding the microstructure, SEBM opens the possibility to tailor the microstructure. Whether a columnar grained or a single crystalline grain microstructure is produced depends on the process strategy used. For the first time it is shown, that it is even possible to produce a single crystalline material by an additive powder bed manufacturing process without any grain selector or a seed crystal. The inherent high cooling rates during SEBM lead to a strong reduction of the length scale of the well-known strong segregations in CMSX-4® to some microns. Therefore, long-time and expensive heat treatments are reduced to minutes for a complete homogenization of the single crystal specimen, even for Re. The specimens produced were investigated by using classical optical-metallography techniques and SEM imaging. Complementary microprobe element mappings and EBSD measurements were performed for a detailed analysis of the microstructure.



FAU-Autoren / FAU-Herausgeber

Körner, Carolin Prof. Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)
Ramsperger, Markus
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)


Zitierweisen

APA:
Körner, C., & Ramsperger, M. (2016). Selective electron beam melting of the single crystalline nickel-base superalloy CMSX-4®: From columnar grains to a single crystal. In M. Hardy, E. Huron, U. Glatzel, B. Griffin, B. Lewis, C. Rae, V. Seetharaman, S. Tin (Eds.), Superalloys 2016: Proceedings of the 13th Intenational Symposium of Superalloys (pp. 341-349). Seven Springs, US: Minerals, Metals and Materials Society.

MLA:
Körner, Carolin, and Markus Ramsperger. "Selective electron beam melting of the single crystalline nickel-base superalloy CMSX-4®: From columnar grains to a single crystal." Proceedings of the 13th International Symposium on Superalloys, SUPERALLOYS 2016, Seven Springs Ed. M. Hardy, E. Huron, U. Glatzel, B. Griffin, B. Lewis, C. Rae, V. Seetharaman, S. Tin, Minerals, Metals and Materials Society, 2016. 341-349.

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Zuletzt aktualisiert 2018-21-11 um 20:50