Phase precipitation and corrosion properties of copper-bearing ferritic stainless steels by annealing process
Fan Wang1,2, De-ning Zou1, Xing-yu Yan1, Ying-bo Zhang3, Ji-xiang Pan4, Yun-xia Cheng4, Ran Xu2, Yi-cheng Jiang2
1 School of Metallurgy and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, Shaanxi, China 2 Shaanxi Special Equipment Inspection and Testing Institute, Xi’an 710048, Shaanxi, China 3 Jilin Railway Technology College, Jilin 132200, Jilin, China 4 Stainless Steel Branch of Gansu Jiu Steel Group Hongxing Iron and Steel Co., Ltd., Jiayuguan 735100, Gansu, China
Phase precipitation and corrosion properties of copper-bearing ferritic stainless steels by annealing process
Fan Wang1,2, De-ning Zou1, Xing-yu Yan1, Ying-bo Zhang3, Ji-xiang Pan4, Yun-xia Cheng4, Ran Xu2, Yi-cheng Jiang2
1 School of Metallurgy and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, Shaanxi, China 2 Shaanxi Special Equipment Inspection and Testing Institute, Xi’an 710048, Shaanxi, China 3 Jilin Railway Technology College, Jilin 132200, Jilin, China 4 Stainless Steel Branch of Gansu Jiu Steel Group Hongxing Iron and Steel Co., Ltd., Jiayuguan 735100, Gansu, China
摘要 The effects of different annealing processes on the phase precipitation behavior and corrosion properties of copper-bearing 430 ferritic stainless steel were systematically investigated. The shape, quantity and distribution of copper-rich precipitates by different annealing processes were characterized by scanning electron microscopy, transmission electron microscopy, backscatter electron and backscatter diffraction. The pitting resistance behavior in simulated physiological saline environments (0.9 wt.% NaCl) was investigated using electrochemical workstation and X-ray photoelectron spectroscopy. The results showed that the copper-rich phase prepared by repeated rolling and annealing gradually changed from long needlelike to short thick rod-like and granular, whose distribution tended to be uniform and diffusive, and the number of copperrich phases increased. After solution/antibacterial annealing process, the size and density of the copper-rich phase increase, resulting in a discontinuity of the passivation film on the stainless steel, which reduces the pitting resistance to some extent. The refinement mechanism revealed that pre-deformation brings about a modification in both precipitation mechanism and growth kinetics of epsilon copper.
Abstract：The effects of different annealing processes on the phase precipitation behavior and corrosion properties of copper-bearing 430 ferritic stainless steel were systematically investigated. The shape, quantity and distribution of copper-rich precipitates by different annealing processes were characterized by scanning electron microscopy, transmission electron microscopy, backscatter electron and backscatter diffraction. The pitting resistance behavior in simulated physiological saline environments (0.9 wt.% NaCl) was investigated using electrochemical workstation and X-ray photoelectron spectroscopy. The results showed that the copper-rich phase prepared by repeated rolling and annealing gradually changed from long needlelike to short thick rod-like and granular, whose distribution tended to be uniform and diffusive, and the number of copperrich phases increased. After solution/antibacterial annealing process, the size and density of the copper-rich phase increase, resulting in a discontinuity of the passivation film on the stainless steel, which reduces the pitting resistance to some extent. The refinement mechanism revealed that pre-deformation brings about a modification in both precipitation mechanism and growth kinetics of epsilon copper.
Fan Wang,De-ning Zou,Xing-yu Yan, et al. Phase precipitation and corrosion properties of copper-bearing ferritic stainless steels by annealing process[J]. Journal of Iron and Steel Research International, 2023, 30(11): 2280-2292.
2023, Vol. 30 
