This research is funded by a Ph.D. grant of the Institute for the Promotion of Innovation through Science and Technology in Flanders (IWT-Vlaanderen). The author also gratefully acknowledges Ir. L. Thijs for detailed analysis of the microstructure and Ing. O. Raeymaekers for his excellent master thesis which formed the groundwork for this publication.
Analysis of Fracture Toughness and Crack Propagation of Ti6Al4V Produced by Selective Laser Melting†
Article first published online: 2 NOV 2011
Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Engineering Materials
Volume 14, Issue 1-2, pages 92–97, February 2012
How to Cite
Van Hooreweder, B., Moens, D., Boonen, R., Kruth, J.-P. and Sas, P. (2012), Analysis of Fracture Toughness and Crack Propagation of Ti6Al4V Produced by Selective Laser Melting. Adv. Eng. Mater., 14: 92–97. doi: 10.1002/adem.201100233
- Issue published online: 7 FEB 2012
- Article first published online: 2 NOV 2011
- Manuscript Revised: 30 SEP 2011
- Manuscript Received: 22 AUG 2011
This paper describes and analyzes fracture toughness and crack propagation of selective laser molten (SLM) components made from Ti6Al4V powder particles. The main goal of this research is to gain more insight in the fracture mechanisms of this relatively new material and to improve the static and dynamic behavior of cracked SLM-Ti components. At first, the SLM process parameters are optimized until the relative material density equals 99.7%. This is close to the relative density of vacuum arc remelted mill annealed standard oxygen titanium which is used as a reference for all experiments. A distinctive difference in phase morphology and texture of the microstructure is noticed between the SLM and the reference titanium. The fine acicular martensite phase of the SLM-Ti results in more brittle behavior and inferior fracture toughness. On the other hand, the fine grained microstructure leads to a large number of grain boundaries acting as obstacle points for crack propagation. Consequently, crack growth properties do not significantly differ between both. Microstructural analysis of the crack growth and final failure areas on the fractured surfaces is performed to study the failure mechanisms in more detail.