Effect of Complex Strengthening on the Continuous Cooling Transformation Behavior of High-Strength Rebar
The effects of niobium and composite strengthening on the phase transformation characteristics and precipitation behavior of continuous cooling transformation of high-strength rebar during thermal deformation and subsequent cooling were investigated. The results show that when the cooling rate was w...
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MDPI AG
2022-12-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/24/8940 |
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| author | Jingtian You Zhiying Li Jie Wang Changrong Li Zeyun Zeng Shiwang Li Sheng Huang |
| author_facet | Jingtian You Zhiying Li Jie Wang Changrong Li Zeyun Zeng Shiwang Li Sheng Huang |
| author_sort | Jingtian You |
| collection | DOAJ |
| description | The effects of niobium and composite strengthening on the phase transformation characteristics and precipitation behavior of continuous cooling transformation of high-strength rebar during thermal deformation and subsequent cooling were investigated. The results show that when the cooling rate was within 0.3–5 °C/s, ferrite transformation and pearlite transformation occurred in the experimental steels. The Nb content increased to 0.062 wt.%, and the starting temperature of the ferrite transformation decreased. Meanwhile, the ferrite phase transformation zone gradually expanded, and the pearlite phase transformation zone gradually narrowed with the increase in the cooling rate. When the cooling rate was 1 °C/s, bainite transformation began to occur, and the amount of transformation increased with the increase in the cooling rate. It was found that the main precipitates in the experimental steels were (Nb, Ti, V)C, with an average particle size of about 10–50 nm. When the Nb content was increased to 0.062 wt.% and the cooling rate was increased to 5 °C/s, the ferrite grain size was reduced from 19.5 to 7.5 μm, and the particle size of the precipitate (Nb, Ti, V)C could be effectively reduced. The strength of the steel was significantly improved, but the elongation of the steel was reduced. However, the comprehensive mechanical properties of 0.062 wt.% Nb experimental steel was significantly improved at a cooling rate of 5 °C/s. |
| first_indexed | 2024-03-09T16:09:16Z |
| format | Article |
| id | doaj.art-a81437cc19b9467985d2cb25a38484e1 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T16:09:16Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-a81437cc19b9467985d2cb25a38484e12023-11-24T16:24:17ZengMDPI AGMaterials1996-19442022-12-011524894010.3390/ma15248940Effect of Complex Strengthening on the Continuous Cooling Transformation Behavior of High-Strength RebarJingtian You0Zhiying Li1Jie Wang2Changrong Li3Zeyun Zeng4Shiwang Li5Sheng Huang6College of Materials and Metallurgy, Guizhou University, Guiyang 550025, ChinaCollege of Materials and Metallurgy, Guizhou University, Guiyang 550025, ChinaShougang Shuicheng Iron and Steel (Group) Co., Ltd., Liupanshui 553000, ChinaCollege of Materials and Metallurgy, Guizhou University, Guiyang 550025, ChinaCollege of Materials and Metallurgy, Guizhou University, Guiyang 550025, ChinaCollege of Materials and Metallurgy, Guizhou University, Guiyang 550025, ChinaCollege of Materials and Metallurgy, Guizhou University, Guiyang 550025, ChinaThe effects of niobium and composite strengthening on the phase transformation characteristics and precipitation behavior of continuous cooling transformation of high-strength rebar during thermal deformation and subsequent cooling were investigated. The results show that when the cooling rate was within 0.3–5 °C/s, ferrite transformation and pearlite transformation occurred in the experimental steels. The Nb content increased to 0.062 wt.%, and the starting temperature of the ferrite transformation decreased. Meanwhile, the ferrite phase transformation zone gradually expanded, and the pearlite phase transformation zone gradually narrowed with the increase in the cooling rate. When the cooling rate was 1 °C/s, bainite transformation began to occur, and the amount of transformation increased with the increase in the cooling rate. It was found that the main precipitates in the experimental steels were (Nb, Ti, V)C, with an average particle size of about 10–50 nm. When the Nb content was increased to 0.062 wt.% and the cooling rate was increased to 5 °C/s, the ferrite grain size was reduced from 19.5 to 7.5 μm, and the particle size of the precipitate (Nb, Ti, V)C could be effectively reduced. The strength of the steel was significantly improved, but the elongation of the steel was reduced. However, the comprehensive mechanical properties of 0.062 wt.% Nb experimental steel was significantly improved at a cooling rate of 5 °C/s.https://www.mdpi.com/1996-1944/15/24/8940high-strength rebarphase transformation characteristicscooling ratebainite(Nb, Ti, V)C |
| spellingShingle | Jingtian You Zhiying Li Jie Wang Changrong Li Zeyun Zeng Shiwang Li Sheng Huang Effect of Complex Strengthening on the Continuous Cooling Transformation Behavior of High-Strength Rebar Materials high-strength rebar phase transformation characteristics cooling rate bainite (Nb, Ti, V)C |
| title | Effect of Complex Strengthening on the Continuous Cooling Transformation Behavior of High-Strength Rebar |
| title_full | Effect of Complex Strengthening on the Continuous Cooling Transformation Behavior of High-Strength Rebar |
| title_fullStr | Effect of Complex Strengthening on the Continuous Cooling Transformation Behavior of High-Strength Rebar |
| title_full_unstemmed | Effect of Complex Strengthening on the Continuous Cooling Transformation Behavior of High-Strength Rebar |
| title_short | Effect of Complex Strengthening on the Continuous Cooling Transformation Behavior of High-Strength Rebar |
| title_sort | effect of complex strengthening on the continuous cooling transformation behavior of high strength rebar |
| topic | high-strength rebar phase transformation characteristics cooling rate bainite (Nb, Ti, V)C |
| url | https://www.mdpi.com/1996-1944/15/24/8940 |
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