High temperature high strength austenitic steel fabricated by laser powder-bed fusion

Dryepondt, Sebastien; Nandwana, Peeyush; Unocic, Kinga A.; Kannan, Rangasayee; Zelaia, Patxi Fernandez; List, III, Fred A.

doi:10.1016/j.actamat.2022.117876

High temperature high strength austenitic steel fabricated by laser powder-bed fusion

Journal Article · Thu Mar 31 04:00:00 EDT 2022 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2022.117876· OSTI ID:1876346

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

Extremely fast cooling rates during laser powder-bed fusion (LPBF) can result in materials with unique microstructures. For LPBF 316L stainless steel, the formation of sub-grain cellular structures with high dislocation density has been linked to superior tensile properties at room temperature. This cellular structure offers also a new route for the development of high temperature LPBF steels with the nucleation of nano-size strengthening carbides in the cell walls. HK30Nb steel (Fe-25Cr-20Ni-Nb-C) was, therefore, fabricated by LPBF to evaluate its potential for high temperature applications. Optimization of the fabrication parameters yielded material with density greater than 99.7%, with nano Nb-rich precipitates in the cell walls. Annealing at 800 °C for 5h resulted in the nucleation and growth of additional precipitates mainly in the cell walls and at grain boundaries. Furthermore, the high dislocation density led to yield strength at 20–900 °C two to three times higher than yield strength for cast HK30Nb and the nano carbides in the cell walls significantly improved the cellular structure stability at 800 °C.

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:: 1876346

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Journal Issue: NA Vol. 231; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

36 MATERIALS SCIENCE
Austenitic steel
Cellular structure
HK30Nb
Laser powder bed fusion (LPBF)
Nano carbides
Tensile

High temperature high strength austenitic steel fabricated by laser powder-bed fusion

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