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• W3048369792 endingPage "33" @default.
• W3048369792 startingPage "19" @default.
• W3048369792 abstract "In this experiment, the origin of dislocation structures in AM stainless steels was systematically investigated by controlling the effect of thermal stress through geometric constraints for the first time. Stainless steel 316L parts were produced in the form of “1D” rods, “2D” walls, and 3D rectangular prisms to evaluate the effect of constraints to thermal expansion/shrinkage on the development of defect microstructures and to elucidate the origin of additively manufactured (AM) dislocation microstructures. Dislocation density, organization, chemical micro-segregation, precipitate structures, and misorientations were analyzed as a function of increasing constraints around solidifying material in 1D, 2D, and 3D components built using both directed energy deposition (DED) and powder-bed selective laser melting (SLM). In DED parts, the dislocation density was not dependent on local misorientations or micro-segregation patterns, but evolved from approximately ρ⊥=1012m−2 in 1D parts toρ⊥=1014m−2 in 3D parts, indicating that it is primarily thermal distortions that produce AM dislocation structures. In DED 3D parts and SLM parts, dislocation densities were highest (ρ⊥ ≈ 1014 m-2) and corresponded to the formation of dislocation cells approximately 300-450 nm in diameter. Dislocation cells overlapped with dendrite micro-segregation in some but not all cases. The results illustrate that dendritic micro-segregation, precipitates, or local misorientations influence how the dislocations organize during processing, but are not responsible for producing the organized cell structures. This work shows that AM dislocation structures originate due to thermal distortions during printing, which are primarily dictated by constraints surrounding the melt pool and thermal cycling." @default.
• W3048369792 created "2020-08-18" @default.
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• W3048369792 date "2020-10-01" @default.
• W3048369792 modified "2023-10-11" @default.
• W3048369792 title "Origin of dislocation structures in an additively manufactured austenitic stainless steel 316L" @default.
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• W3048369792 doi "https://doi.org/10.1016/j.actamat.2020.07.063" @default.
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