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Title: In Situ Neutron Diffraction Study of the Influence of Microstructure on the Mechanical Response of Additively Manufactured 304L Stainless Steel

In situ neutron diffraction measurements were completed for this study 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. Finally, a ~50 MPa flow strength tension/compression asymmetry was observed in the AM material, and several potential causes were examined.
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [1] ;  [1] ;  [2] ;  [4] ;  [5] ;  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  3. Canadian Nuclear Laboratories, Chalk River (Canada)
  4. Pennsylvania State Univ., University Park, PA (United States)
  5. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Publication Date:
Report Number(s):
SAND-2017-2935J; LA-UR-17-22138
Journal ID: ISSN 1073-5623; PII: 4330; TRN: US1800256
Grant/Contract Number:
AC04-94AL85000; AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science
Additional Journal Information:
Journal Volume: 48; Journal Issue: 12; Journal ID: ISSN 1073-5623
Publisher:
ASM International
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING; additive manufacture, Neutron diffraction
OSTI Identifier:
1411620
Alternate Identifier(s):
OSTI ID: 1429998

Brown, D. W., Adams, D. P., Balogh, L., Carpenter, J. S., Clausen, B., King, G., Reedlunn, B., Palmer, T. A., Maguire, M. C., and Vogel, S. C.. In Situ Neutron Diffraction Study of the Influence of Microstructure on the Mechanical Response of Additively Manufactured 304L Stainless Steel. United States: N. p., Web. doi:10.1007/s11661-017-4330-4.
Brown, D. W., Adams, D. P., Balogh, L., Carpenter, J. S., Clausen, B., King, G., Reedlunn, B., Palmer, T. A., Maguire, M. C., & Vogel, S. C.. In Situ Neutron Diffraction Study of the Influence of Microstructure on the Mechanical Response of Additively Manufactured 304L Stainless Steel. United States. doi:10.1007/s11661-017-4330-4.
Brown, D. W., Adams, D. P., Balogh, L., Carpenter, J. S., Clausen, B., King, G., Reedlunn, B., Palmer, T. A., Maguire, M. C., and Vogel, S. C.. 2017. "In Situ Neutron Diffraction Study of the Influence of Microstructure on the Mechanical Response of Additively Manufactured 304L Stainless Steel". United States. doi:10.1007/s11661-017-4330-4. https://www.osti.gov/servlets/purl/1411620.
@article{osti_1411620,
title = {In Situ Neutron Diffraction Study of the Influence of Microstructure on the Mechanical Response of Additively Manufactured 304L Stainless Steel},
author = {Brown, D. W. and Adams, D. P. and Balogh, L. and Carpenter, J. S. and Clausen, B. and King, G. and Reedlunn, B. and Palmer, T. A. and Maguire, M. C. and Vogel, S. C.},
abstractNote = {In situ neutron diffraction measurements were completed for this study 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. Finally, a ~50 MPa flow strength tension/compression asymmetry was observed in the AM material, and several potential causes were examined.},
doi = {10.1007/s11661-017-4330-4},
journal = {Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science},
number = 12,
volume = 48,
place = {United States},
year = {2017},
month = {10}
}

Works referenced in this record:

Laser additive manufacturing of metallic components: materials, processes and mechanisms
journal, May 2012

Overview: high-nitrogen alloying of stainless steels
journal, March 1996