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- Title
Effect of Molten Pool Size on Microstructure and Tensile Properties of Wire Arc Additive Manufacturing of Ti-6Al-4V Alloy.
- Authors
Qianru Wu; Jiping Lu; Changmeng Liu; Hongli Fan; Xuezhi Shi; Jie Fu; Shuyuan Ma
- Abstract
Wire arc additive manufacturing (WAAM) technique is a cost-competitive and efficient technology to produce large structure components in industry domains. Mechanical properties are mainly dominated by the microstructure of the components, which is deeply affected by the molten pool size. In this work, to investigate the effect of the molten pool size on microstructure and mechanical properties of the components, a series of Ti-6Al-4V alloy blocks with different width of molten pool (WMP) ranging from 7 mm to 22 mm were deposited by adjusting the wire feed speed (WFS) from 100 cm/min to 500 cm/min. It is interesting to find that the macrostructure changes from columnar grains to equiaxial grains, and then returns to large columnar grains with the increase of WMP, which is mainly caused by the different cooling rates and thermal gradients. Nonetheless, the tensile properties of the components have a tendency to decline with the increase of WMP.
- Subjects
MICROSTRUCTURE; TENSILE architecture; COLUMNAR structure (Metallurgy); MECHANICAL behavior of materials; TITANIUM alloys
- Publication
Materials (1996-1944), 2017, Vol 10, Issue 7, p749
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma10070749