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Effect of Controlling Nb Content and Cooling Rate on the Microstructure, Precipitation Phases, and Mechanical Properties of Rebar.
Shen, Bin; Gu, Shangjun; Wang, Jie; Wei, Fulong; Li, Zhiying; Zeng, Zeyun; Zhang, Junxiang; Li, Changrong.
Afiliação
  • Shen B; College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China.
  • Gu S; Guizhou Province Key Laboratory of Metallurgical and Process Energy Saving, Guiyang 550025, China.
  • Wang J; Shougang Shuicheng Iron and Steel (Group) Co., Ltd., Liupanshui 553000, China.
  • Wei F; Shougang Shuicheng Iron and Steel (Group) Co., Ltd., Liupanshui 553000, China.
  • Li Z; Shougang Shuicheng Iron and Steel (Group) Co., Ltd., Liupanshui 553000, China.
  • Zeng Z; College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China.
  • Zhang J; Guizhou Province Key Laboratory of Metallurgical and Process Energy Saving, Guiyang 550025, China.
  • Li C; College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China.
Materials (Basel) ; 17(7)2024 Mar 28.
Article em En | MEDLINE | ID: mdl-38612058
ABSTRACT
Seismic anti-seismic rebar, as materials for supporting structures in large buildings, need to have excellent mechanical properties. By increasing the Nb content and controlling the cooling rate, the microstructure and precipitation behavior of the steel are adjusted to develop seismic anti-seismic rebar with excellent mechanical properties. Scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), and a universal tensile testing machine were used to characterize the microstructure, precipitation phases, and mechanical properties of the experimental steels. The results show that the ferrite grain size, pearlite lamellae layer (ILS), and small-angle grain boundaries (LAGB) content of the high-Nb steels decreased to 6.39 µm, 0.12 µm, and 48.7%, respectively, as the Nb content was increased from 0.017 to 0.023 wt.% and the cooling rate was increased from 1 to 3 °C·s-1. The strength of the {332}<113>α texture is the highest in the high-Nb steels. The precipitated phase is (Nb, Ti, V)C with a diameter of ~50 nm, distributed on ferrite, and the matrix/precipitated phase mismatch is 8.16%, forming a semicommon-lattice interface between the two. The carbon diffusion coefficient model shows that increasing the Nb content can inhibit the diffusion of carbon atoms and reduce the ILS. The yield strength of the high-Nb steel is 556 MPa, and the tensile strength is 764 MPa.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Materials (Basel) Ano de publicação: 2024 Tipo de documento: Article País de afiliação: China

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Materials (Basel) Ano de publicação: 2024 Tipo de documento: Article País de afiliação: China