Site specific control of crystallographic grain orientation through electron beam additive manufacturing

Dehoff, Ryan R.; Sames, William J.; Bilheux, Hassina Z.; Tresmsin, Anton S.; Lowe, Larry E.; Babu, Sudarsanam Suresh; Kirka, M. M.

doi:10.1179/1743284714Y.0000000734

Title: Site specific control of crystallographic grain orientation through electron beam additive manufacturing

Journal Article · Wed Dec 10 00:00:00 EST 2014 · Materials Science and Technology

DOI:https://doi.org/10.1179/1743284714Y.0000000734· OSTI ID:1242663

Dehoff, Ryan R. ^[1]; Sames, William J. ^[2]; Bilheux, Hassina Z. ^[1]; Tresmsin, Anton S. ^[3]; Lowe, Larry E. ^[1]; Babu, Sudarsanam Suresh ^[4]; Kirka, M. M. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Texas A & M Univ., College Station, TX (United States)
Univ. of California, Berkeley, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

Site specific control of the crystallographic orientation of grains within metal components has been unachievable prior to the advent of metals additive manufacturing (AM) technologies. To demonstrate the capability, the growth of highly misoriented micron-scale grains outlining the letters D, O, and E, through the thickness of a 25.4 mm tall bulk block comprised of primarily columnar [001] oriented grains made of the nickel-base superalloy Inconel 718 was promoted. To accomplish this, electron beam scan strategies were developed based on principles of columnar to equiaxed transitions during solidification. Through changes in scan strategy, the electron beam heat source can rapidly change between point and line heat source modes to promote steady state and/or transient thermal gradients and liquid-solid interface velocity. With this approach, an equiaxed-solidification in the regions bounding the letters D, O, and E was achieved. The through thickness existence of the equiaxed grain structure outlining the letters within a highly columnar [001] oriented bulk was confirmed through characterizing the bulk specimen with energy-selective neutron radiography and confirming with a electron backscatter detection (EBSD). Here, this demonstration promotes the ability to build metal components with site-specific control on crystallographic orientation of grains using electron beam melting process.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1242663

Journal Information:: Materials Science and Technology, Vol. 31, Issue 8; ISSN 0267-0836

Publisher:: Taylor & Francis

Country of Publication:: United States

Language:: English

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