D0L:10.13374.issn1001-053x.2013.09.006 第35卷第9期 北京科技大学学报 Vol.35 No.9 2013年9月 Journal of University of Science and Technology Beijing Sep.2013 铌含量对低碳微合金钢回复再结晶行为的影响 吴圣杰12)，聂文金1,3)，尚成嘉)☒，缪成亮1)，张晓兵3) 1)北京科技大学材料科学与工程学院，北京100083 2)江苏省（沙钢）钢铁研究院，张家港215625 3)江苏沙钢集团有限公司总工程师办公室，张家港215625 ☒通信作者，E-mail:cishang@ustb.edu.cm 摘要采用应力松弛实验研究了低C含Nb微合金钢奥氏体热变形过程中的析出及再结晶动力学过程，通过实验及 理论模型分析了析出/溶质拖曳对回复和再结晶行为的影响.结果显示：随Nb含量的增加，析出动力学曲线的鼻尖温度 上升，但鼻尖温度对应的时间变化不大，约为2030s:析出可明显抑制再结晶的发生，增加Nb含量将使非再结晶温 度升高：Nb溶质通过拖曳作用阻碍晶界运动，减小了晶界迁移率，最终减慢再结晶过程的发生：对于低C含Nb实验 钢，拟合得到再结晶激活能与Nb质量分数的0.5次方成正比. 关键词低碳钢：微合金化：铌：析出：再结晶：回复：激活能：应力松弛 分类号TG142.3 Effect of niobium on the recovery and recrystallization behavior of low-carbon micro-alloyed steel WU Sheng-jie12),NIE Wen-jin 1),SHANG Cheng-jia),MIAO Cheng-liang),ZHANG Xiao-bing 1)School of Material Science and Technology,University of Science and Technology Beijing,Beijing 100083,China 2)Institute of Research of Iron and Steel,Sha-Steel,Zhangjiagang 215625,China 3)Chief Engineer Office,Jiangsu Sha-Steel Group Co.Ltd.,Zhangjiagang 215625,China Corresponding author,E-mail:cjshang@ustb.edu.cn ABSTRACT The kinetic processes of recrystallization and precipitation in low carbon steels with different Nb contents were studied by stress-relaxation method.The effects of Nb solute drag and its precipitation on the recovery and recrystallization behavior were analyzed by the experiment and theoretical model.When the Nb content increases, the nose temperature of precipitation kinetic curves(PTT)rises,but the time of precipitation corresponding to the nose temperature changes a little,which is about 20 to 30 s.The precipitation can obviously restrain the recrystallization process,and increasing the Nb content makes the non-recrystallized temperature rise.The Nb solute drag can inhibit the mobility of grain boundaries,lead to the decreasing mobility rate of grain boundaries,and finally cause the process of recrystallization retarded.The recrystallized activation energy is linear with the square root of Nb mass fraction. KEY WORDS low carbon steel;microalloying;niobium;precipitation;recrystallization;recovery;activation energy; stress relaxation 微合金元素Nb析出相的钉扎及溶质拖曳作下能力有限，提出利用Nb能显著提高非再结晶温 用，能强烈地延迟奥氏体的回复和再结晶四，因度这一特点，开发出低C高Nb成分体系的高温 而Nb被广泛应用于控制轧制的高性能钢的生产上. 轧制工艺(HTP),并应用于高级别控轧控冷钢的生 尤其是在20世纪80年代，针对当时的钢厂轧机压产2-.近年来，对低C高Nb成分体系进行了系 收稿日期：2012-07-30 基金项目：国家重点基础研究发展计划资助项目(2010CB63080)第 35 卷 第 9 期 北 京 科 技 大 学 学 报 Vol. 35 No. 9 2013 年 9 月 Journal of University of Science and Technology Beijing Sep. 2013 铌含量对低碳微合金钢回复再结晶行为的影响 吴圣杰1,2)，聂文金1,3)，尚成嘉1) ，缪成亮1)，张晓兵3) 1) 北京科技大学材料科学与工程学院，北京 100083 2) 江苏省 (沙钢) 钢铁研究院，张家港 215625 3) 江苏沙钢集团有限公司总工程师办公室，张家港 215625 通信作者，E-mail: cjshang@ustb.edu.cn 摘 要 采用应力松弛实验研究了低 C 含 Nb 微合金钢奥氏体热变形过程中的析出及再结晶动力学过程，通过实验及 理论模型分析了析出/溶质拖曳对回复和再结晶行为的影响. 结果显示：随 Nb 含量的增加，析出动力学曲线的鼻尖温度 上升，但鼻尖温度对应的时间变化不大，约为 20∼30 s；析出可明显抑制再结晶的发生，增加 Nb 含量将使非再结晶温 度升高；Nb 溶质通过拖曳作用阻碍晶界运动，减小了晶界迁移率，最终减慢再结晶过程的发生；对于低 C 含 Nb 实验 钢，拟合得到再结晶激活能与 Nb 质量分数的 0.5 次方成正比. 关键词 低碳钢；微合金化；铌；析出；再结晶；回复；激活能；应力松弛 分类号 TG142.3 Effect of niobium on the recovery and recrystallization behavior of low-carbon micro-alloyed steel WU Sheng-jie 1,2), NIE Wen-jin 1,3), SHANG Cheng-jia 1) , MIAO Cheng-liang 1), ZHANG Xiao-bing 3) 1) School of Material Science and Technology, University of Science and Technology Beijing, Beijing 100083, China 2) Institute of Research of Iron and Steel, Sha-Steel, Zhangjiagang 215625, China 3) Chief Engineer Office, Jiangsu Sha-Steel Group Co. Ltd., Zhangjiagang 215625, China Corresponding author, E-mail: cjshang@ustb.edu.cn ABSTRACT The kinetic processes of recrystallization and precipitation in low carbon steels with different Nb contents were studied by stress-relaxation method. The effects of Nb solute drag and its precipitation on the recovery and recrystallization behavior were analyzed by the experiment and theoretical model. When the Nb content increases, the nose temperature of precipitation kinetic curves (PTT) rises, but the time of precipitation corresponding to the nose temperature changes a little, which is about 20 to 30 s. The precipitation can obviously restrain the recrystallization process, and increasing the Nb content makes the non-recrystallized temperature rise. The Nb solute drag can inhibit the mobility of grain boundaries, lead to the decreasing mobility rate of grain boundaries, and finally cause the process of recrystallization retarded. The recrystallized activation energy is linear with the square root of Nb mass fraction. KEY WORDS low carbon steel; microalloying; niobium; precipitation; recrystallization; recovery; activation energy; stress relaxation 微合金元素 Nb 析出相的钉扎及溶质拖曳作 用，能强烈地延迟奥氏体的回复和再结晶 [1]，因 而 Nb 被广泛应用于控制轧制的高性能钢的生产上. 尤其是在 20 世纪 80 年代，针对当时的钢厂轧机压 下能力有限，提出利用 Nb 能显著提高非再结晶温 度这一特点，开发出低 C 高 Nb 成分体系的高温 轧制工艺 (HTP)，并应用于高级别控轧控冷钢的生 产 [2−4] . 近年来，对低 C 高 Nb 成分体系进行了系 收稿日期：2012-07-30 基金项目：国家重点基础研究发展计划资助项目 (2010CB63080) DOI:10.13374/j.issn1001-053x.2013.09.006