Evaluation of microstructural development in electron beam melted Ti-6Al-4V
- Division of Materials Science, Malmoe University, SE-205 06 Malmoe (Sweden)
- Arcam AB, SE 43137, Moelndal (Sweden)
- Institute of Microtechnology and Nanoscience, Chalmers University of Technology (Sweden)
In the current work an investigation of the microstructures of EBM built Ti-6Al-4V test bars has been performed using OM, SEM, TEM and XRD. It has been found that the prior {beta} phase, that formed during the initial solidification, possesses a column shaped morphology with growing direction parallel to built direction. Typical ({alpha} + {beta}) structures namely Widmanstaetten {alpha} platelets with rod-like {beta} phase formed on the interfaces of the fine {alpha} grains, have been observed in the columnar prior {beta} grains. Grain boundary {alpha} phase was found to be formed around the boundaries of the columnar prior {beta} grains. Different phases present in the parts, especially the BCC {beta} phases have been characterized. The TEM/EDX results indicate very high V composition in the {beta} phase. Results of TEM/SAED and XRD also revealed that a superlattice structure could be present in the {beta} phase. Phase transformation sequence is discussed according to the processing history and the microstructures observed. - Highlights: Black-Right-Pointing-Pointer {alpha} + {beta} and individual {beta} phase is observed and characterized by SEM, TEM and XRD. Black-Right-Pointing-Pointer {beta}-phase is identified as rod-like structure embedded in {alpha} matrix and platelets. Black-Right-Pointing-Pointer Phase transformation sequence is discussed as per thermal history and microstructures.
- OSTI ID:
- 22066424
- Journal Information:
- Materials Characterization, Vol. 65, Issue Complete; Other Information: Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
- Country of Publication:
- United States
- Language:
- English
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