Using In Situ Neutron Diffraction to Isolate Specific Features of Additively Manufactured Microstructures in 304L Stainless Steel and Identify Their Effects on Macroscopic Strength

Brown, Donald William; Adams, D. P.; Balogh, L.; Carpenter, John S.; Clausen, Bjorn; Livescu, Veronica; Martinez, Ramon Matthew; Morrow, Benjamin Mark; Palmer, T. A.; Pokharel, Reeju; Strantza, M.; Vogel, S. C.

doi:10.1007/s11661-019-05240-x

Using In Situ Neutron Diffraction to Isolate Specific Features of Additively Manufactured Microstructures in 304L Stainless Steel and Identify Their Effects on Macroscopic Strength

Journal Article · Wed May 01 00:00:00 EDT 2019 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/s11661-019-05240-x· OSTI ID:1650149

^[1]; Adams, D. P. ^[2]; Balogh, L. ^[3]; ^[1]; ^[1]; ^[1]; Martinez, Ramon Matthew ^[1]; ^[1]; Palmer, T. A. ^[4]; ^[1]; Strantza, M. ^[1]; Vogel, S. C. ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Queens Univ., Kingston, Ontario (Canada)
Pennsylvania State Univ., University Park, PA (United States)

Additive manufacturing of metal components results in unique microstructures with, necessarily, mechanical properties that are distinct from conventionally produced components. In this paper, four distinct microstructural features associated with directed energy deposition of 304L stainless steels, their stability, and their influences on flow strength were examined. These were (1) high dislocation density comparable with deformed materials, (2) increased ferrite content, (3) local chemical heterogeneity, and (4) tortuous grain morphology. In situ neutron diffraction measurements were used to monitor the evolution of the as-built microstructure during post-build heat treatment and relate the specific microstructural features to the strength behavior of the material following the heat treatment. The increased flow strength of the additively manufactured material relative to wrought counterparts is found to be due primarily to an increased dislocation density in the as-built material. However, the increased dislocation density does not completely account for the increased strength and it is hypothesized that some of the additional strength is related to the unique AM grain structure.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States). Los Alamos Neutron Science Center (LANSCE)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000; 89233218CNA000001; NA0003525

OSTI ID:: 1650149

Alternate ID(s):: OSTI ID: 1688740

Report Number(s):: SAND--2020-7993J; 687839

Journal Information:: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 7 Vol. 50; ISSN 1073-5623

Publisher:: ASM InternationalCopyright Statement

Country of Publication:: United States

Language:: English

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