Role of ferrite and austenite phases on the deformation behavior and mechanical properties in heterogeneous nanostructured duplex stainless steel aged at different temperatures

Koga, Norimitsu; Suzuki, Shinya; Jiang, Hua; Watanabe, Tatsuki; Watanabe, Chihiro; Miyajima, Yoji; Miura, Hiromi

doi:10.1007/s10853-022-06924-3

Cited by 6 publications

(1 citation statement)

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“…Lean duplex stainless steel (LDSS) had excellent corrosion resistance and high mechanical properties, as well as better price stability, and was a substitute for the current classical austenite stainless steel. [1][2][3] Due to the special dual-phase structure and high N content of LDSS, poor thermoplastic had always been the key problem restricting its production and application. Meanwhile, the large difference in the strength of the ferrite phase and austenite phase occurred under the hot working state.…”

Section: Introductionmentioning

confidence: 99%

Deformation Behavior and Texture Evolution of Ferrite and Austenite Phases in Lean Duplex Stainless Steel

Zhang,

Cao,

et al. 2024

steel research int.

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To avoid cracks during hot rolling, a short process of direct cold rolling following solution treatment of the casting billet for preparing lean duplex stainless steel plates is proposed. The effect of cold rolling reduction on the microstructure, texture, and mechanical properties of UNS S32101 is investigated. The results show that dislocation slip is the main character in ferrite, which leads to dislocation tangles, dislocation cells, high‐density dislocation walls, and deformed microbands. However, twinning and strain‐induced martensite transformation (SIMT) occur in austenite, and the SIMT mechanism of austenite follows the classical model γ → ε → α′ and γ → α′, with the orientation relationship of Kurdjumov–Sachs ( and ) and Nishyama–Wassermann (N–W) ( and ). Meanwhile, at 50%, there is a transition from Cu texture to Brass texture in the austenite phase. At 12.5%, the yield strength is 344 MPa higher than that of the traditional hot rolling process, and the elongation remains about 35%. With the increasing cold rolling reduction, the elongation decreases while the strength rises significantly. Strengthening dislocations, fine‐tuning grains, and SIMT are the primary contributors to the improvement in strength.

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Section: Introductionmentioning

confidence: 99%