Investigation of the Dynamic Strain Aging Effect in Austenitic Weld Metals by 3D-DIC

Amke Lescur, Erich Stergar, Jun Lim, Stijn Hertelé, Roumen Petrov

    Research outputpeer-review

    Abstract

    Austenitic stainless steels similar to type AISI 316L are widely used structural materials in current and future nuclear reactors. Careful development and characterization of these materials and their welds is needed to verify the structural integrity of large-scale multicomponent structures. Understanding the local deformation behavior in heterogeneous materials and the mechanisms involved is key to further improve the performance and reliability of the materials at the global scale and can help in developing more accurate models and design rules. The full-field 3D digital image correlation (3D-DIC) technique was used to characterize two 316L multi-pass welds, based on cylindrical uniaxial tensile tests at room temperature, 350 °C, and 450 °C. The results were compared to solution annealed 316L material. The inhomogeneous character and dynamic behavior of the 316L base and weld materials were successfully characterized using 3D-DIC data, yielding high-quality and accurate local strain calculations for geometrically challenging conditions. The difference in character of the dynamic strain aging (DSA) effect present in base and weld materials was identified, where local inhomogeneous straining in weld material resulted in discontinuous type A Portevin–Le Châtelier (PLC) bands. This technique characterized the difference between local and global material behavior, whereas standard mechanical tests could not.
    Original languageEnglish
    Article number311
    Number of pages14
    JournalMetals
    Volume13
    Issue number2
    DOIs
    StatePublished - 3 Feb 2023

    ASJC Scopus subject areas

    • Metals and Alloys
    • Materials Science(all)

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