Compressive properties and micro-structural characteristics of Ti–6Al–4V fabricated by electron beam melting and selective laser melting

Xiao, L., Song, W., Hu, M. and Li, P. (2019) Compressive properties and micro-structural characteristics of Ti–6Al–4V fabricated by electron beam melting and selective laser melting. Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing, 764, 138204. (doi:10.1016/j.msea.2019.138204)

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Abstract

Bulk Ti–6Al–4V material and its lattice structures with rhombic dodecahedron unit cells are fabricated by electron beam melting (EBM) and selective laser melting (SLM) method respectively. The effect of part size on the compressive properties and failure modes of the material is taken into consideration. Electronic universal testing machine and Split Hopkinson pressure bar (SHPB) system are adopted for experiments, and the compressive behavior of the additively manufactured materials is investigated accordingly. Meanwhile, multiscale observations are conducted to reveal the macro- and microscopic deformation mechanism. The results showed that the mechanical response of the dense struts as well as micro-lattice structures manufactured by the two processes are quite different. The geometric imperfections are considered to reduce the strength of the undersized struts prepared by EBM. The specimens fabricated by both of the two approaches exhibit elastic-plastic deformation. Besides, the SLM made material is found to be more sensitive to strain rate especially for that below 1000/s than the EBM parts.

Item Type:Articles
Additional Information:The author acknowledges the financial support of the National Natural Science Foundation of China (11672043, 11802028), the Project funded by China Postdoctoral Science Foundation (2018M640072), the National Key R&D Program of China (2016YFC0801200), the Opening Project of State Key Laboratory of Traction Power (TPL1701), the Project of State Key Laboratory of Explosion Science and Technology (YBKT18-07), the Graduate Technological Innovation Project of Beijing Institute of Technology (2017CX10013) and other projects of China (6140922020116BQ01002, 614260601010617 and SAST2017-029).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Li, Dr Peifeng
Authors: Xiao, L., Song, W., Hu, M., and Li, P.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing
Publisher:Elsevier
ISSN:0921-5093
ISSN (Online):1873-4936
Published Online:23 July 2019

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