Microstructural manifestation of dynamic strain aging in AISI 316 stainless steel

Wade Karlsen (Corresponding Author), M. Ivanchenko, Ulla Ehrnstén, Y. Yagodzinskyy, Hannu Hänninen

    Research output: Contribution to journalArticleScientificpeer-review

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    Abstract

    Dynamic strain aging (DSA) affects a material’s mechanical behaviour. In the current study, the deformation microstructures of AISI 316 stainless steel specimens were examined after tensile testing at several temperatures both in and out of the DSA-regime (200, 288 and 400 °C), and the effect of straining on free nitrogen evolution at those temperatures was studied by Anelastic Mechanical Loss Spectrometry (Internal Friction). Analysis of the nitrogen-induced Snoek-like peak after straining indicated that DSA behaviour is associated with the formation of sub-micron scale, nitrogen-enriched zones in the austenitic matrix. Long-range planarity was observed in the dislocation structures at 400 °C and short-range planarity at 288 °C, but at 200 °C the microstructure exhibited cellular dislocation structure. Diffusion re-distribution of nitrogen in the DSA-regime affected the deformation behaviour of the material by restricting cross-slip, which in turn promotes strain localization, degrading the mechanical performance of the material.
    Original languageEnglish
    Pages (from-to)156-161
    Number of pages6
    JournalJournal of Nuclear Materials
    Volume395
    Issue number1-3
    DOIs
    Publication statusPublished - 2009
    MoE publication typeA1 Journal article-refereed

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