Microstructure and high temperature tensile properties of 316L fabricated by laser powder-bed fusion

Dryepondt, Sebastien N.; Nandwana, Peeyush; Fernandez-Zelaia, Patxi; List III, Fred

doi:10.1016/j.addma.2020.101723

Microstructure and high temperature tensile properties of 316L fabricated by laser powder-bed fusion

Journal Article · Wed Nov 18 23:00:00 EST 2020 · Additive Manufacturing

DOI:https://doi.org/10.1016/j.addma.2020.101723· OSTI ID:1817598

^[1]; ^[1]; Fernandez-Zelaia, Patxi ^[1]; ^[1]

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

316L stainless steel fabricated by laser powder-bed fusion (LPBF) has attracted significant attention due to a unique combination of strength and ductility at room temperature. Understanding of high temperature tensile properties of LPBF fabricated 316L is, however, limited. In the present investigation, tensile testing was conducted at 20–700ºC on LPBF 316L in as printed condition and after annealing for 5 h at 500–800ºC. Room temperature data confirmed the excellent ductility of the LPBF-processed 316L steel due to the cellular structure with high dislocation density. However, a significant decrease in ductility was observed at temperatures above 200ºC. These results are consistent with a change of deformation mechanisms observed in wrought 316L, with twinning playing a key role at room temperature. Finally, microstructure characterization and tensile testing revealed that the cellular structure is stable up to 500ºC, but a decrease of yield strength was observed at temperatures above 600ºC likely due to a decrease in dislocation density via annealing.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1817598

Alternate ID(s):: OSTI ID: 1809817

Journal Information:: Additive Manufacturing, Journal Name: Additive Manufacturing Journal Issue: 1 Vol. 37; ISSN 2214-8604

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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