|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing for Energy Applications III
||Cold Spray Mitigation of Chloride-induced Stress Corrosion Cracking in Austenitic Stainless Steel Welds
||Haozheng Qu, Timothy Montoya, Rebecca Schaller, Eric Schindelholz, Kyle Johnson, Janelle Wharry
|On-Site Speaker (Planned)
The objective of this presentation is to understand how cold spray affects the microstructure, residual stress, and chloride-induced stress corrosion cracking (CISCC) susceptibility of stainless steel (SS) 304L welds. CISCC is a potential concern for welds of austenitic SS canisters used in spent nuclear fuel dry storage. Welding-induced tensile residual stresses are key factors influencing CISCC susceptibility, but cold spray deposition can counteract these residual stresses. In this study, four-point bent specimens of SS304L containing central arc welds were cold sprayed with SS304L particles. Sprayed and unsprayed specimens were CISCC tested in boiling MgCl2. Cold spraying prolonged crack initiation times by more than an order of magnitude. Crack initiation and residual stress were evaluated by scanning electron microscopy (SEM) with electron backscatter diffraction (EBSD) and nanoindentation. Implications on CISCC and repair strategies will be discussed.
SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525. SAND2020-6713 A.