L2 Milestone 5433: Characterization of Dynamic Behavior of AM and Conventionally Processed Stainless Steel (316L and 304L)

Technical Report · Mon Sep 26 04:00:00 EDT 2016

DOI:https://doi.org/10.2172/1329535· OSTI ID:1329535

Gray, George Thompson ^[1]; Livescu, Veronica ^[1]; Rigg, P. A. ^[2]; Trujillo, Carl Patrick ^[1]; Cady, Carl McElhinney ^[1]; Chen, Shuh-Rong ^[1]; Carpenter, John S. ^[1]; Lienert, Thomas J. ^[1]; Fensin, Saryu Jindal ^[1]; Knapp, Cameron M. ^[1]; Beal, Roberta Ann ^[1]; Morrow, Benjamin ^[1]; Dippo, Olivia F. ^[3]; Jones, David Robert ^[1]; Martinez, Daniel Tito ^[1]; Valdez, James Anthony ^[1]

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1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
2. Washington State Univ., Pullman, WA (United States). Inst. for Shock Physics
3. Univ. of California, San Diego, CA (United States)

For additive manufacturing (AM) of metallic materials, the certification and qualification paradigm needs to evolve as there currently exists no broadly accepted “ASTM- or DIN-type” additive manufacturing certified process or AM-material produced specifications. Accordingly, design, manufacture, and thereafter implementation and insertion of AM materials to meet engineering applications requires detailed quantification of the constitutive (strength and damage) properties of these evolving materials, across the spectrum of metallic AM methods, in comparison/contrast to conventionally-manufactured metals and alloys. This report summarizes the 316L SS research results and presents initial results of the follow-on study of 304L SS. For the AM-316L SS investigation, cylindrical samples of 316L SS were produced using a LENS MR-7 laser additive manufacturing system from Optomec (Albuquerque, NM) equipped with a 1kW Yb-fiber laser. The microstructure of the AM-316L SS was characterized in both the “as-built” Additively Manufactured state and following a heat-treatment designed to obtain full recrystallization to facilitate comparison with annealed wrought 316L SS. The dynamic shock-loading-induced damage evolution and failure response of all three 316L SS materials was quantified using flyer-plate impact driven spallation experiments at peak stresses of 4.5 and 6.35 GPa. The results of these studies are reported in detail in the first section of the report. Publication of the 316L SS results in an archival journal is planned. Following on from the 316L SS completed work, initial results on a study of AM 304L SS are in progress and presented herein. Preliminary results on the structure/dynamic spallation property behavior of AM-304L SS fabricated using both the directed-energy LENS and an EOS powder-bed AM techniques in comparison to wrought 304L SS is detailed in this Level 2 Milestone report.

• Research Organization: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP) (NA-10)
• Contributing Organization: Washington State Univ., Pullman, WA (United States); Univ. of California, San Diego, CA (United States)
• DOE Contract Number: AC52-06NA25396
• OSTI ID: 1329535
• Report Number(s): LA-UR--16-27337
• Country of Publication: United States
• Language: English

Related Subjects

316L SS
36 MATERIALS SCIENCE
additive manufacturing
damage evolution
microstructure
spallation