@article {1406,
	title = {Solidification-driven orientation gradients in additively manufactured stainless steel},
	journal = {Acta Materialia},
	volume = {183},
	year = {2020},
	pages = {249{\textendash}260},
	abstract = {<p>
	A sample of 304L stainless steel manufactured by Laser Engineered Net Shaping (LENS) was characterized in 3D using TriBeam tomography. The crystallographic, structural, and chemical properties of the as-deposited microstructure have been studied in detail. 3D characterization reveals complex grain morphologies and large orientation gradients, in excess of 10o, that are not easily interpreted from 2D cross-sections alone. Misorientations were calculated via a methodology that locates the initial location and orientation of grains that grow during the build process. For larger grains, misorientation increased along the direction of solidification. For grains with complex morphologies, K-means clustering in orientation space is demonstrated as a useful approach for determining the initial growth orientation. The gradients in misorientation directly tracked with gradients in chemistry predicted by a Scheil analysis. The accumulation of misorientation is linked to the solutal and thermal solidification path, offering potential design pathways for novel alloys more suited for additive manufacturing.
</p>
},
	keywords = {Additive manufacturing, Microstructure, Solidification, Tomography, Tribeam},
	issn = {13596454},
	doi = {10.1016/j.actamat.2019.10.047},
	author = {Polonsky, Andrew T. and Lenthe, William C. and Echlin, Mclean P. and Livescu, Veronica and Gray, George T. and Pollock, Tresa M.}
}
@article {1586,
	title = {Twin related domain networks in Ren{\'e} 88DT},
	journal = {Materials Characterization},
	volume = {165},
	year = {2020},
	pages = {110365},
	abstract = {<p>
	Annealing twins in wrought fcc materials have historically been characterized using simple 2D measures including morphology and volume fraction. Accurately describing twin related domain microstructure requires accounting for their complex 3D structure. A large microstructural volume of a nickel-base alloy Ren\&eacute; 88DT has been collected using TriBeam tomography for full characterization of a large number of complete twin related domains. A network based approach enables visualization of twin domain structures. Metrics adapted from graph theory enable the first quantitative 3D microstructure descriptions. The implications for fatigue properties in twinned nickel-base alloys are discussed.
</p>
},
	keywords = {3D EBSD, Annealing twin boundaries, Graph theory, Nickel-base superalloy, Recrystallization, Tribeam, Twins},
	issn = {10445803},
	doi = {10.1016/j.matchar.2020.110365},
	url = {https://doi.org/10.1016/j.matchar.2020.110365},
	author = {Lenthe, William C. and Echlin, Mclean P. and Stinville, Jean C. and De Graef, Marc and Pollock, Tresa M.}
}
