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Understanding the Microstructure Formation of Ti-6Al-4V During Direct Laser Deposition via In-Situ Thermal Monitoring

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Abstract

Understanding the thermal phenomena associated with direct laser deposition (DLD) is an important step toward obtaining ‘process–property–performance’ relationships for various designed parts and materials, as well as achieving increased process control for meeting application constraints. In this study, a thermally monitored laser engineered net shaping (LENS™) system was used with time-invariant (uncontrolled) build parameters to construct Ti-6Al-4V cylinders. During fabrication, the part’s thermal history and melt pool temperature were recorded via an in-chamber infrared camera and a dual-wavelength pyrometer, respectively. These tools demonstrate the use of non-destructive thermographic inspection for ensuring target part quality and/or microstructure. For the chosen part geometry, the melt pool was found to be approximately 40%–50% superheated during DLD, reaching temperatures as high as 2500°C. Temperature gradients varied and peaked around 1000°C/mm along the diameter of the relatively small cylinders. Cooling rates within the melt pool were found to increase as maximum melt pool temperature increased, for instance, from 12,000°C/s to 25,000°C/s. The post-DLD Ti-6Al-4V microstructure was found to vary from columnar near the substrate, or substrate-affected zone, to equiaxed approximately 2–3 mm from the substrate. Bulk heating of the part due to successive layer deposits was shown to promote α″ to an α + β decomposition, while prior-β grains were observed near and far from the substrate.

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Acknowledgements

The research presented here, including all fabrication and experimentation, was conducted at Mississippi State University’s Center for Advanced Vehicular Systems (CAVS).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Mississippi State University, Box 9552, Mississippi State, MS, 39762, USA

    Garrett J. Marshall, W. Joseph Young II, Scott M. Thompson, Nima Shamsaei & Steve R. Daniewicz

  2. Center for Advanced Vehicular Systems, Mississippi State University, Box 5405, Mississippi State, MS, 39762, USA

    Scott M. Thompson, Nima Shamsaei, Steve R. Daniewicz & Shuai Shao

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  1. Garrett J. Marshall
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  2. W. Joseph Young II
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Correspondence to Scott M. Thompson.

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Marshall, G.J., Young, W.J., Thompson, S.M. et al. Understanding the Microstructure Formation of Ti-6Al-4V During Direct Laser Deposition via In-Situ Thermal Monitoring. JOM 68, 778–790 (2016). https://doi.org/10.1007/s11837-015-1767-z

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  • DOI: https://doi.org/10.1007/s11837-015-1767-z

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