Abstract
This preliminary work documents the effects of test orientation with respect to build and beam raster directions on the fracture toughness and fatigue crack growth behavior of as-deposited EBM Ti-6Al-4V. Although ASTM/ISO standards exist for determining the orientation dependence of various mechanical properties in both cast and wrought materials, these standards are evolving for materials produced via additive manufacturing (AM) techniques. The current work was conducted as part of a larger America Makes funded project to begin to examine the effects of process variables on the microstructure and fracture and fatigue behavior of AM Ti-6Al-4V. In the fatigue crack growth tests, the fatigue threshold, Paris law slope, and overload toughness were determined at different load ratios, R, whereas fatigue precracked samples were tested to determine the fracture toughness. The as-deposited material exhibited a fine-scale basket-weave microstructure throughout the build, and although fracture surface examination revealed the presence of unmelted powders, disbonded regions, and isolated porosity, the resulting mechanical properties were in the range of those reported for cast and wrought Ti-6Al-4V. Remote access and control of testing was also developed at Case Western Reserve University to improve efficiency of fatigue crack growth testing.
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10 January 2018
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Acknowledgements
This work was supported by America Makes, the National Additive Manufacturing Innovation Institute, under Project No. 4009: “Rapid Qualification Methods for Powder Bed Direct Metal Additive Manufacturing Processes” through Contract No. FA8650-12-2-7230 and it is highly appreciated. Additional support was provided by an ASTM Scholarship (M. Seifi) and the Armington Professorship (J. Lewandowski). Various discussions with academic team members as well as industrial partners and government laboratories during monthly webinars are appreciated. These include four other university partners (NCSU, CMU, U of L, and WSU), five industrial partners (Lockheed Martin, Pratt & Whitney, GE, Kennametal and Bayer) and two government laboratories (ORNL and NIST). Various discussions with ASTM F42/E08 committee members are also appreciated, as is access to equipment in the Advanced Manufacturing and Mechanical Reliability Center (AMMRC) at CWRU.
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A correction to this article is available online at https://doi.org/10.1007/s11837-018-2736-0.
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Seifi, M., Dahar, M., Aman, R. et al. Evaluation of Orientation Dependence of Fracture Toughness and Fatigue Crack Propagation Behavior of As-Deposited ARCAM EBM Ti-6Al-4V. JOM 67, 597–607 (2015). https://doi.org/10.1007/s11837-015-1298-7
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DOI: https://doi.org/10.1007/s11837-015-1298-7