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

Körner C, Ramsperger M (2016)

Publication Language: English

Publication Status: Published

Publication Type: Conference contribution, Conference Contribution

Publication year: 2016

Publisher: Minerals, Metals and Materials Society

Pages Range: 341-349

Conference Proceedings Title: Superalloys 2016: Proceedings of the 13th Intenational Symposium of Superalloys

Event location: Seven Springs US

ISBN: 9781118996669

DOI: 10.1002/9781119075646.ch37

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.

Authors with CRIS profile

Carolin Körner Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle) Markus Ramsperger Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)

Related research project(s)

Activity SEBM of special alloys Jan. 1, 2000 - Jan. 1, 2003 Activity Development of process strategies Jan. 1, 2000 - Jan. 1, 2003

How to cite

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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