期刊
ACTA MATERIALIA
卷 108, 期 -, 页码 161-175出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2016.02.005
关键词
Additive manufacturing; Nickel-based superalloys; Neutron diffraction; Texture; Lattice strains
资金
- Laboratory Directed Research and Development Program of Oak Ridge National Laboratory
- U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office [DE-AC05-00OR22725]
- Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
- UT-Battelle, LLC
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1308548] Funding Source: National Science Foundation
Theta-shaped specimens were additively manufactured out of Inconel 718 powders using an electron beam melting technique, as a model complex load bearing structure. Two different build strategies were employed; producing two sets of specimens. Microstructural and micro-mechanical characterizations were performed using electron back-scatter, synchrotron x-ray and in-situ neutron diffraction techniques. In particular, the cross-members of the specimens were the focus of the synchrotron x-ray and in-situ neutron diffraction measurements. The build strategies employed resulted in the formation of distinct microstructures and crystallographic textures, signifying the importance of build-parameter manipulation for microstructural optimization. Large strain anisotropy of the different lattice planes was observed during in-situ loading. Texture was concluded to have a distinct effect upon both the axial and transverse strain responses of the cross-members. In particular, the (200), (220) and (420) transverse lattice strains all showed unexpected overlapping trends in both builds. This was related to the strong (200) textures along the build/loading direction, providing agreement between the experimental and calculated results. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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