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

D. W. Brown, D. P. Adams, L. Balogh, J. S. Carpenter, B. Clausen, V. Livescu, R. M. Martinez, B. M. Morrow, Todd Palmer, R. Pokharel, M. Strantza, S. C. Vogel

Research output: Contribution to journalArticle

Abstract

Additive manufacturing of metal components results in unique microstructures with, necessarily, mechanical properties that are distinct from conventionally produced components. In this work, 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.

Original languageEnglish (US)
Pages (from-to)3399-3413
Number of pages15
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume50
Issue number7
DOIs
StatePublished - Jul 15 2019

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Stainless Steel
Neutron diffraction
neutron diffraction
stainless steels
Stainless steel
microstructure
Microstructure
3D printers
Heat treatment
heat treatment
Crystal microstructure
Ferrite
Metals
ferrites
Mechanical properties
manufacturing
mechanical properties
metals
energy

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

Cite this

Brown, D. W. ; Adams, D. P. ; Balogh, L. ; Carpenter, J. S. ; Clausen, B. ; Livescu, V. ; Martinez, R. M. ; Morrow, B. M. ; Palmer, Todd ; Pokharel, R. ; Strantza, M. ; Vogel, S. C. / Using In Situ Neutron Diffraction to Isolate Specific Features of Additively Manufactured Microstructures in 304L Stainless Steel and Identify Their Effects on Macroscopic Strength. In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science. 2019 ; Vol. 50, No. 7. pp. 3399-3413.
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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, D. W.; Adams, D. P.; Balogh, L.; Carpenter, J. S.; Clausen, B.; Livescu, V.; Martinez, R. M.; Morrow, B. M.; Palmer, Todd; Pokharel, R.; Strantza, M.; Vogel, S. C.

In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 50, No. 7, 15.07.2019, p. 3399-3413.

Research output: Contribution to journalArticle

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