A new processing route to develop nano-grained structure of a TRIP-aided austenitic stainless-steel using double reversion fast-heating annealing

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:808

Article

Jarvenpaa, Antti¹  Ghosh, Sumit²  Khosravifard, Ali³  Jaskari, Matias¹  Hamada, Atef¹ 

[1] Univ Oulu, Future Mfg Technol FMT, Kerttu Saalasti Inst, Pajatie 5, FI-85500 Nivala, Finland

[2] Univ Oulu, Ctr Adv Steels Res, Mat & Mech Engn, POB 4200, Oulu 90014, Finland

[3] Islamic Azad Univ, Sch Engn, Met & Mat Engn Dept, Shiraz Branch, Box 71993-1, Shiraz, Iran

关键词: Phase-reversion annealing;    Grain refinement;    Mechanical properties;    Formability;    Finite element method;   

DOI  :  10.1016/j.msea.2021.140917

来源: Elsevier

【 摘 要 】

A novel processing route comprising double reversion annealing (DRA) was designed for developing bulk nano-grained (NG) structure of an austenitic stainless steel (Type 301LN). The new processing concept of DRA comprised two subsequent intrinsic type processes i.e., two times cold reductions (similar to 53% and 63%) followed by fast induction heating (similar to 200 degrees C/s) and short duration annealing at different temperatures (first at 690 degrees C/60s and second at 750-900 degrees C/0.1-1s). The NG structure revealed a remarkable improvement of the mechanical properties compared to the counterparts processed by single reversion annealing. Furthermore, outstanding combination of strength and formability is achieved for the DRA structures, significantly higher than those of high-Mn TWIP steels, low-alloy TRIP steels and 304 stainless steel. For instance, a superior combination of yield strength (similar to 950-1030 MPa) and formability index (11.8-12.5 mm) obtained after DRA at 750 degrees C/0.1s and 800 degrees C/1 s, respectively. However, the corresponding values are 300 MPa and 12 mm for TWIP steels, 500 MPa and 10 mm for TRIP steels, and 270 MPa and 12 mm for 304 stainless steel. In order to reveal the effect of DRA on the stretch formability, Erichsen cup testing was conducted of both the initial and DRA steel specimens. Moreover, Erichsen cup testing also simulated by the finite element method (FEM) to survey further details of their deformation.

【 授权许可】

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