TRIP型ベイナイト鋼の低サイクル疲労硬化挙動

概要

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Fatigue hardening-softening behavior of a newly developed "TRIP-aided bainitic (TB) steel" which is composed of a bainitic ferrite matrix and retained austenite films was examined. A significant fatigue hardening, similar to "TRIP-aided dual-phase (TDP) steel" and conventional ferrite-martensite dual-phase steel, was exhibited in the TB steel, particularly when austempered at temperatures higher than the martensitestart temperature. This was mainly caused by an increase in the strain-induced martensite content and development of severe cell structure in the matrix. Compressive internal stress in the matrix resulting from the stable and strain-hardened retained austenite films was expected to make a relatively small contribution to the fatigue hardening, differing from that of the TDP steel.
社団法人日本鉄鋼協会の論文