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| 铌、钒对高强钢筋再结晶影响及轧制工艺设计 | |
| 引用本文： | 蒲春雷,林银河,尹国亮,田野,程相魁,方实年.铌、钒对高强钢筋再结晶影响及轧制工艺设计[J].钢铁,2021,56(10):146-151. |
| 作者姓名： | 蒲春雷 林银河 尹国亮 田野 程相魁 方实年 |
| 作者单位： | 1.攀枝花学院国际钒钛研究院, 四川 攀枝花 617000; 2.中冶华天工程技术有限公司智能化发展部, 江苏 南京 210019; 3.宜宾学院材料与化学工程学部, 四川 宜宾 644007 |
| 基金项目： | 安徽省重点研究和开发计划资助项目(201904a05020008); 攀西试验区计划资助项目(2017-CY-G-24) |
| 摘 要： | 为了研究和设计高强钢筋添加铌、钒后轧制过程中对奥氏体区再结晶行为的量化管控,采用Gleeble-3500热模拟机对铌、钒微合金化高强螺纹钢进行单轴热压缩试验,基于再结晶临界条件的热力学原理,通过对不同形变条件下应力-应变曲线分析,采用Avrami方程得到了不同变形条件下的再结晶动力学曲线,并根据再结晶动力学曲线,量化对比分析了铌、钒微合金化对高强螺纹钢再结晶开始、转变及终了过程的影响。结果表明,铌、钒微合金化螺纹钢的热压缩过程均呈现了明显的动态再结晶特征,由于微合金元素Nb/Nb+V的添加,阻碍了20MnSi钢的动态再结晶,变形温度的提高或应变速率的增加可促进再结晶。针对生产中利用动态再结晶而组织调控进行了工艺设计,精轧机组中成品机架前进行冷却和回复,确保830 ℃左右有利再结晶分数达到95%。 |
| 关 键 词： | 螺纹钢 动力学 动态再结晶 轧制工艺 微合金化 |
| 收稿时间： | 2021-03-16 |
Influence of Nb and V on recrystallization of high-strength steel bars and design of rolling process |
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| PU Chun-lei,LIN Yin-he,YIN Guo-liang,TIAN Ye,CHENG Xiang-kui,FANG Shi-nian.Influence of Nb and V on recrystallization of high-strength steel bars and design of rolling process[J].Iron & Steel,2021,56(10):146-151. | |
| Authors: | PU Chun-lei LIN Yin-he YIN Guo-liang TIAN Ye CHENG Xiang-kui FANG Shi-nian |
| Affiliation: | 1. International Research Institute of Vanadium and Titanium, Panzhihua University, Panzhihua 617000, Sichuan, China; 2. Intelligent Development Department, MCC Huatian Engineering and Technology Corporation, Nanjing 210019, Jiangsu, China; 3. Chemistry and Chemical Engineering College, Yibin University, Yibin 644007, Sichuan, China |
| Abstract: | In order to study and design the quantitative control of the recrystallization behavior of the austenite region during the rolling process of high-strength steel bars after adding niobium and vanadium,the Gleeble-3500 thermal simulator was adopted to conduct uniaxial hot compression tests on niobium and vanadium microalloyed high-strength rebars. Based on the thermodynamic principle of the critical condition of recrystallization,the Avrami equation was used to obtain the recrystallization kinetic curve under different deformation conditions through the analysis of the stress-strain curve under different deformation conditions. And the niobium is quantitatively compared and analyzed according to the recrystallization kinetic curve. The effect of vanadium microalloying on the beginning,transformation,and end process of recrystallization of high-strength rebar was studied carefully. The results showed that the hot compression process of niobium and vanadium microalloyed rebars showed obvious characteristics of dynamic recrystallization. The addition of microalloying elements Nb/Nb+V hindered the dynamic recrystallization of 20MnSi steel and increased the deformation temperature. Or an increase in strain rate can promote recrystallization. Rolling Process design was carried out for the use of dynamic recrystallization and organization control in production. The calculations indicated cooling and recovery could be carried out before the finished stand in the finishing mill to ensure the recrystallization fraction(95%),where the temperature was around 830 ℃. |
| Keywords: | rebar kinetics dynamic recrystallization rolling process microalloying |
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