Cyclic Plasticity and Microstructure of As-built SLM Ti-6Al-4V: The Effect of Build Orientation
D. Agius, K.I. Kourousis, C. Wallbrink, T. Song
Materials Science & Engineering: A (2017) -- Free access to the full article available at: https://authors.elsevier.com/a/1VHXL_Ky~FZJ6H
Peipei Li Derek Warner Ali Fatemi Nam Phan
Abstract: To realize the potential benefits of additive manufacturing technology in airframe and ground vehicle applications, the fatigue performance of load bearing additively manufactured materials must be understood. Due to the novelty of this rapidly developing technology, a very limited, yet swiftly evolving literature exists on the topic. Motivated by these two points, we have attempted to catalog and analyze the published fatigue performance data of an additively manufactured alloy of significant technological interest, Ti–6Al–4V. Focusing on uniaxial fatigue performance, we compare to traditionally manufactured Ti–6Al–4V, discussing failure mechanisms, defects, microstructure, and processing parameters. We then attempt to identify key knowledge gaps that must be addressed before AM technology can safely and effectively be employed in critical load bearing applications.
Here is the link for the paper: http://www.sciencedirect.com/science/article/pii/S0142112315004399
Abstract: Metallic microlattice is a new class of material that combines useful mechanical properties of metals with smart geometrical orientations providing greater stiffness, strength-to-weight ratio and good energy absorption capacity than other types of cellular materials used in sandwich construction such as honeycomb, folded and foam. Metallic microlattices consist of micro struts stacked in different arrangements and most of the volume is occupied by air voids. Relative density and strut stacking order are the prime design variables of this ultralight material and the mechanical properties could be engineered by controlling these parameters. The base metal i.e. stainless steel, titanium alloy etc. used in producing microlattices, obviously, would affect its behavior. A number of processes are reported in literature to produce metallic microlattices, which could significantly affect its mechanical properties. This paper presents an overview of manufacturing and processing of microlattices with the corresponding mechanical properties. Current techniques adopted for modeling its structural response are discussed herein. Possible future uses of microlattices and the demonstrated use of cellular materials analogous to applications of microlattices are also explored in this paper as practical applications are yet to be demonstrated for this innovative ultralight material.
M.G. Rashed, M. Ashraf, R.A.W. Mines, P.J. Hazell, Metallic microlattice materials: A current state of the art on manufacturing, mechanical properties and applications, Materials & Design. 95 (2016) 518–533. doi:10.1016/j.matdes.2016.01.146.
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