Solidification-driven orientation gradients in additively manufactured stainless steel
作者： Andrew T. Polonsky , William C. Lenthe , McLean P. Echlin , Veronica Livescu , George T. Gray
DOI: 10.1016/J.ACTAMAT.2019.10.047
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摘要: Abstract 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 the as-deposited microstructure have been studied detail. characterization reveals complex grain morphologies large orientation gradients, excess 10∘, that are not easily interpreted from 2D cross-sections alone. Misorientations were calculated via a methodology locates initial location grains grow during build process. For larger grains, misorientation increased along direction solidification. with morphologies, K-means clustering space is demonstrated as useful approach for determining growth orientation. gradients directly tracked chemistry predicted Scheil analysis. accumulation linked to solutal thermal solidification path, offering potential design pathways novel alloys more suited additive manufacturing.
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