Journal
CORROSION SCIENCE
Volume 152, Issue -, Pages 20-30Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2019.02.029
Keywords
Stainless steel; Pitting corrosion; Porosity; Delta ferrite; Segregation; Sensitization; Powder bed laser fusion (PBLF); Selective laser melting (SLM); Passivity
Funding
- U.S. Department of Energy's National Nuclear Security Administration [DE-NA0003525]
- Department of Defense
- Department of Energy
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The impact of microstructure and processing defects of directed energy deposition (DED) 304L stainless steel on its corrosion behavior was investigated. Materials produced by DED with heat inputs of 0.45 and 0.03 kJ/min were compared to wrought 304L. Lack of fusion pores in the DED material controlled breakdown potential (E-b) to the first order, reducing it by up to 400 mV versus the base material in 0.6 M NaCl. The hierarchal control of these and other microstructure features, nanoscale oxides and delta-ferrite, and processing features on the E-b of DED 304L is addressed.
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