Permanent Strength of Interstitial-free Steel Processed by Severe Plastic Deformation and Subsequent Annealing

نویسندگان

چکیده

The permanent strengths of interstitial-free (IF) steels with different grain sizes and dislocation densities processed by severe plastic deformation (SPD) subsequent annealing are systematically investigated. Permanent strength, which is athermal time-independent, corresponds to the fundamental capability bear stresses caused external forces. Sufficiently long-time (24 h) stress relaxation tests were carried out experimental stress–relaxation time relationships extrapolated estimate strength that remained after an infinite passed. flow observed in standard uniaxial tension increased repeated SPD processes, fraction was mostly above 65%. also repetition low-temperature further augmented strength. During dislocation-related strengthening dominant, while grain-size-related minor, i.e., Hall–Petch relation does not hold. On other hand, annealing, became quickly replacing strengthening. In a coarse-grain region, consistent classical relation. It confirmed original holds only region it indicates “softening coarsening due annealing”, “strengthening refinement SPD”.

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ژورنال

عنوان ژورنال: Isij International

سال: 2023

ISSN: ['0915-1559', '1347-5460']

DOI: https://doi.org/10.2355/isijinternational.isijint-2022-328