Friction surfacing and cold spray deposition for surface crack repair in austenitic stainless steels

• Published in: Materials today communications Vol. 33; no. C; p. 104692
• Main Authors: Agiwal, Hemant, Yeom, Hwasung, Pocquette, Nicholas, Sridharan, Kumar, Pfefferkorn, Frank E.
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier Ltd 01.12.2022; Elsevier
• Subjects: Cold spray deposition; Crack repair; Friction surfacing; Stainless steel; Crack repair; Friction surfacing; Cold spray deposition; Stainless steel
• ISSN: 2352-4928; 2352-4928
• DOI: 10.1016/j.mtcomm.2022.104692

Two technologies, friction surfacing (FS) and cold spray deposition (CSD), have been investigated for field repair of cracks in 304 L austenitic stainless steel. Both technologies are low-heat-input, solid-state technologies that do not introduce the detrimental effects of solidification, such as compositionally segregated microstructures and shrinkage stresses. Friction surfacing was performed using a 304L stainless steel rod over the substrate of the same material. The process was performed at a high spindle speed of 20,000 RPM allowing for process forces below 500 N to be used effectively. Spherical gas-atomized 304L stainless steel powder, in size range of 25–44 µm, was used as feedstock powder for the cold spray process for deposition on 304L substrates. Both technologies showed leak-tight crack repair capabilities on ∼ 30–50 µm wide simulated through-crack specimens based on helium leak tests. [Display omitted]