Structural refinement and property optimization in an Fe-23Cr-8.5Ni duplex stainless steel

38th Risø International Symposium on Materials Science

Xie, L.^1 ; Huang, T.L.^1 ; Wang, Y.H.^2 ; Zhang, L.^1 ; Wu, G.L.^1 ; Tsuji, N.^3 ; Huang, X.^4

College of Materials Science and Engineering, Chongqing University, Chongqing

400045, China^1

National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao

066004, China^2

Department of Materials Science and Engineering, Kyoto University, Kyoto

606-8501, Japan^3

Section for Materials Science and Advanced Characterization, Department of Wind Energy, Technical University of Denmark, Roskilde

DK-4000, Denmark^4

关键词: Cold-rolled;    Duplex stainless steel;    Grain size;    Micrometer scale;    Nano scale;    Structural refinement;    Tensile elongation;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/219/1/012045/pdf
DOI  :  10.1088/1757-899X/219/1/012045

来源: IOP

【 摘 要 】

An Fe-23Cr-8.5Ni duplex stainless steel was used to prepare samples with different volume-fraction-weighted grain sizes (dαγ), ranging from the nano-scale to the micrometer- scale by cold rolling and subsequent annealing. The cold rolled sample with dαγof 72 nm showed a high yield strength of about 1.3 GPa but only a small tensile elongation. An abrupt increase of ductility was observed as dαγincreased to 375 nm, resulting in a good combination of yield strength of 738 MPa and tensile elongation of 29%. Further increase of dαγup to the micrometer-scale results in continued decreases in yield strength but with only a limited improvement in the ductility.