期刊
MATERIALS & DESIGN
卷 150, 期 -, 页码 193-205出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2018.03.065
关键词
Wire plus arc additive manufacturing; Intersections; Rolling; Stress relieving; Ti-6Al-4V; Microstructure
资金
- AMAZE project - European Commission in the 7th Framework Programme [313781]
- Lloyd's Register Foundation
- EPSRC [EP/K030884/1] Funding Source: UKRI
Additively manufactured intersections have the theoretical risk to contain hydrostatic tensile residual stresses, which eventually cannot be thermally stress relieved. The stresses in Ti-6Al-4V wire + arc additively manufactured (WAAM) intersections are lower compared to single pass walls and stresses in continuous walls are larger compared to discontinuous walls with otherwise identical geometry. Thermal stress relief was found to virtually eliminate them. Inter-pass rolling can yield the desired grain refinement, without having any noteworthy influence on the development of residual stresses. The strain measurement itself by neutron diffraction is facilitated by the refinedmicrostructure, because the otherwise textured microstructure produces anisotropic peak intensity, not allowing Pawley refinement. Without rolling, the {10 (1) over bar1} and {10 (1) over bar3} family of hcp planes are the only ones that diffract consistently in the three principal directions. (C) 2018 Published by Elsevier Ltd.
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