Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 48A, Issue 12, Pages 6055-6069Publisher
SPRINGER
DOI: 10.1007/s11661-017-4330-4
Keywords
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Funding
- Sandia National Laboratories Laboratory Directed Research and Development (LDRD) program
- United States Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
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In situ neutron diffraction measurements were completed during tensile and compressive deformation of stainless steel 304L additively manufactured (AM) using a high power directed energy deposition process. Traditionally produced wrought 304L material was also studied for comparison. The AM material exhibited roughly 200 MPa higher flow stress relative to the wrought material. Crystallite size, crystallographic texture, dislocation density, and lattice strains were all characterized to understand the differences in the macroscopic mechanical behavior. The AM material's initial dislocation density was about 10 times that of the wrought material, and the flow strength of both materials obeyed the Taylor equation, indicating that the AM material's increased yield strength was primarily due to greater dislocation density. Also, a similar to 50 MPa flow strength tension/compression asymmetry was observed in the AM material, and several potential causes were examined. (C) The Minerals, Metals & Materials Society and ASM International 2017
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