Corrosion Testing of Friction Stir Welded 304L Stainless Steel

Technical Report · Fri Aug 30 04:00:00 EDT 2019

DOI:https://doi.org/10.2172/1569520· OSTI ID:1569520

Schindelholz, Eric John ^[1]; Rodelas, Jeffrey ^[1]; Melia, Michael Anthony ^[1]; Montoya, Timothy ^[1]

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1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

A preliminary study on the microstructural characteristics and stress corrosion cracking susceptibility of a friction stir welded (FSW) 304L stainless steel plate was carried out. The weld examined was characterized by several typical microstructural features of friction stir welds including a gradient of dynamically recrystallized microstructure with distinct material flow patterns reflective of the complex distribution of thermomechanical histories. Evidence of process-induced microstructural sensitization was lacking Immersion testing of the friction stir welded plate in boiling magnesium chloride solution indicated the FSW region was more susceptible to SCC than the base 304L material, especially along the weld toes. The microstructural origins of this SCC susceptibility are not clear, but it is likely driven by residual stress imparted by the welding process. Future work will focus on direct examination of the SCC damaged microstructure and residual stress of the weld zone to further clarify the operative characteristics controlling SCC susceptibility.

• Research Organization: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE Office of Nuclear Energy (NE), Office of Spent Fuel and Waste Disposition. Office of Spent Fuel and Waste Science and Technology
• DOE Contract Number: AC04-94AL85000; NA0003525
• OSTI ID: 1569520
• Report Number(s): SAND--2019-11773R; 679854
• Country of Publication: United States
• Language: English

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