The authors would like to thank Arcam AB for assisting in EBM processing. Klaus Markmann and Brigitte Schaff are acknowledged for producing the cast and the directional solidification samples, respectively. Thanks are also going to Dr. Frank Stein for performing the DTA measurements. This project was partly supported by a scholarship from the Hans Werthén foundation, Arcam AB and the CAPE research centre financed by the Knowledge Foundation in Sweden.
Effect of Processing on Microstructure and Physical Properties of Three Nickel-Based Superalloys with Different Hardening Mechanisms†
Article first published online: 30 APR 2012
Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Engineering Materials
Volume 14, Issue 7, pages 427–438, July 2012
How to Cite
Strondl, A., Milenkovic, S., Schneider, A., Klement, U. and Frommeyer, G. (2012), Effect of Processing on Microstructure and Physical Properties of Three Nickel-Based Superalloys with Different Hardening Mechanisms. Adv. Eng. Mater., 14: 427–438. doi: 10.1002/adem.201100349
- Issue published online: 3 JUL 2012
- Article first published online: 30 APR 2012
- Manuscript Revised: 4 APR 2012
- Manuscript Received: 21 DEC 2011
- Knowledge Foundation in Sweden
The nickel-based superalloys Inconel alloy 600, Udimet alloy 720, and Inconel alloy 718 were produced by electron beam melting (EBM), casting, and directional solidification (DS). The distance between dendrites and the size of the precipitates indicated the difference in solidification rates between the three processes. In this study, the solidification rate was fastest with EBM, closely followed by casting, whereas it was much slower with DS. In the directional solidified materials the <100> direction was the fastest and thus, preferred growth direction. The EBM samples show a sharp (001) texture in the building direction and in the two scanning directions of the electron beam. Macrosegregation was observed in some cast and directionally solidified samples, but not in the EBM samples. The melting temperatures are in good agreement with literature and the narrow melting interval of IN600 compare to UD720 and IN718 might reduce the risk of incipient melting during EBM processing. Porosity was observed in the EBM samples and the reasons are discussed. However, EBM seems to be a feasible process route to produce nickel-based superalloys with well-defined texture, no macrosegregation and a rapidly solidified microstructure.