Strength-ductility synergy through microstructural and compositional heterogeneity in directed energy deposition additive manufacturing of face-centered cubic materials

Ahsan, Md R.U.; Hmeidat, Nadim S.; Islam, Saiful; Fan, Xuesong; Poplawsky, Jonathan D.; Liaw, Peter K.; Lee, Yousub; Compton, Brett G.; Jeon, Yongho; Kim, Duck Bong

doi:10.1016/j.jmrt.2024.10.253

Strength-ductility synergy through microstructural and compositional heterogeneity in directed energy deposition additive manufacturing of face-centered cubic materials

Journal Article · Fri Nov 01 00:00:00 EDT 2024 · Journal of Materials Research and Technology

DOI:https://doi.org/10.1016/j.jmrt.2024.10.253· OSTI ID:2477523

Ahsan, Md R.U. ^[1]; ^[2]; ^[1]; Fan, Xuesong ^[3]; ^[4]; Liaw, Peter K. ^[3]; ^[2]; Compton, Brett G. ^[3]; Jeon, Yongho ^[5]; ^[1]

Tennessee Technological Univ., Cookeville, TN (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Ajou University, Suwon (Korea, Republic of)

Directed energy deposition (DED) is an additive manufacturing (AM) process based on welding technology and offers the advantages of large build volume, high deposition rate, and ability to fabricate multi-material parts. Epitaxial continuous columnar grain growth is a characteristic microstructural feature of DED processed alloys. In this study, a bamboo-like microstructure (periodic alternation of equiaxed and columnar structure) was produced by adopting an intermittent deposition strategy in 316L stainless steel and Inconel 625. The formation of a bamboo-like alternating microstructure was confirmed through electron backscattered diffraction (EBSD) analysis. Hardness mapping showed that the columnar to equiaxed transition (CET) occurred at the region right below the fusion line. A finite element (FE) model was used to investigate the relationship between the temperature gradient (G) and the solidification rate (R). The FE model showed a low G/R ratio at the region right below the interface promoting the CET. The grain size and material-dependent deformation behaviors are analyzed using digital image correlation (DIC). The lower deformation on the fine-grain regions observed in DIC analysis is attributed to a higher strain hardening rate, which is confirmed through dislocation density analysis on a tensile-interrupted specimen. The periodically alternating grain size coupled with the microstructural changes caused by intermittent deposition strategy result in a better strength-ductility synergy in both single-material and bimetallic specimens.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Materials & Manufacturing Technologies Office (AMMTO); National Research Foundation of Korea (NRF)

Grant/Contract Number:: AC05-00OR22725; 2015693; RS-2024-00346883

OSTI ID:: 2477523

Journal Information:: Journal of Materials Research and Technology, Vol. 33; ISSN 2238-7854

Publisher:: Brazilian Metallurgical, Materials and Mining AssociationCopyright Statement

Country of Publication:: United States

Language:: English

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