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Thermal effects on microstructural heterogeneity of Inconel 718 materials fabricated by electron beam melting

Published online by Cambridge University Press:  28 July 2014

William J. Sames ,
Kinga A. Unocic ,
Ryan R. Dehoff ,
Tapasvi Lolla  and
Sudarsanam S. Babu
William J. Sames*
Affiliation:
Department of Nuclear Engineering, Texas A&M University, College Station, TX 77843, USA
Kinga A. Unocic
Affiliation:
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
Ryan R. Dehoff
Affiliation:
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA; and Manufacturing Demonstration Facility, Oak Ridge National Laboratory, Knoxville, TN 37932, USA
Tapasvi Lolla
Affiliation:
Department of Materials Science and Engineering, Ohio State University, Columbus, OH 43210, USA
Sudarsanam S. Babu
Affiliation:
Manufacturing Demonstration Facility, Oak Ridge National Laboratory, Knoxville, TN 37932, USA; and Department of Mechanical, Aerospace and Biomedical Engineering, University of Tennessee, Knoxville, TN 37996, USA
*
a)Address all correspondence to this author. e-mail: wsames@tamu.edu
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Abstract

Additive manufacturing technologies, also known as 3D printing, have demonstrated the potential to fabricate complex geometrical components, but the resulting microstructures and mechanical properties of these materials are not well understood due to unique and complex thermal cycles observed during processing. The electron beam melting (EBM) process is unique because the powder bed temperature can be elevated and maintained at temperatures over 1000 °C for the duration of the process. This results in three specific stages of microstructural phase evolution: (a) rapid cool down from the melting temperature to the process temperature, (b) extended hold at the process temperature, and (c) slow cool down to the room temperature. In this work, the mechanisms for reported microstructural differences in EBM are rationalized for Inconel 718 based on measured thermal cycles, preliminary thermal modeling, and computational thermodynamics models. The relationship between processing parameters, solidification microstructure, interdendritic segregation, and phase precipitation (δ, γ′, and γ″) are discussed.

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Type
Invited Papers
Information
Journal of Materials Research , Volume 29 , Issue 17: Focus Issue: The Materials Science of Additive Manufacturing , 14 September 2014 , pp. 1920 - 1930
Copyright
Copyright © Materials Research Society 2014 

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