Development of high-fidelity imaging procedures to establish the local material behavior in friction stir welded stainless steel joints

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Ramachandran, S. and Lakshminarayanan, A. K. and Reed, Philippa and Dulieu-Barton, J. M. (2019) Development of high-fidelity imaging procedures to establish the local material behavior in friction stir welded stainless steel joints. Metals, 9 (5). 592. ISSN 2075-4701 (https://doi.org/10.3390/met9050592)

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Abstract

Friction stir welded (FSW) 304 austenitic stainless steel (SS) joints are studied using a range of microstructural characterization techniques to identify various sub-regions across the weld. A high-resolution (HR) 2D-digital image correlation (DIC) methodology is developed to assess the local strain response across the weld surface and cross-section in the elastic regime. The HR-DIC methodology includes the stitching of multiple images, as it is only possible to partially cover the FSW region using a single camera with the high-resolution optical set-up. An image processing procedure is described to stitch the strain maps as well as strain data sets that allow full-field strain to be visualized and interrogated over the entire FSW region. It is demonstrated that the strains derived from the DIC can be associated with the local weld geometry and the material microstructure in the region of the FSW. The procedure is validated in the material elastic range and provides an important first step in enabling detailed mechanical assessments of the local effects in the FSW process.

ORCID iDs

Ramachandran, S. ORCID logoORCID: https://orcid.org/0000-0002-6881-2940, Lakshminarayanan, A. K., Reed, Philippa and Dulieu-Barton, J. M.;
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