CSP条件下稀土微合金钢的静态再结晶行为  

Static Recrystallization Behavior of RE Micro-alloy Steel Based on the CSP Condition

作　　者：贾幼庆 王海燕[1,2] 龚佳禾[1,2] 李德超[1] 任慧平 

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室,内蒙古包头014010

出　　处：《稀土》2017年第1期25-30,共6页Chinese Rare Earths

基　　金：国家自然科学基金(51101083);内蒙古自然科学基金(2013MS0813)

摘　　要：研究CSP基料在随后冷轧退火过程中的组织演变与静态再结晶行为,对于力学性能的控制具有重要意义。以普通低碳SPCC钢和加入稀土的低碳SPCC钢为研究对象,冷轧变形71%后分别在560℃到640℃(每隔20℃)进行再结晶退火,退火时间分别为10~2s,10^(2.5)s,10~3s,10^(3.5)s,10~4s。采用光学显微镜观察冷轧与再结晶试样显微组织,运用Image-tool软件统计金相组织晶粒大小,通过分析各温度时间的再结晶百分比,计算了两种钢的再结晶激活能。结果表明,稀土元素能细化再结晶后的晶粒,并提高再结晶温度和再结晶激活能。本实验条件下,未加稀土与加稀土的再结晶激活能分别为148 k J/mol和221 k J/mol。Research on the microstructure evolution and static recrystallization behavior during annealing of the cold rolled strip based on the CSP process is important to control mechanical properties of steels. RE addition and RE free low carbon SPCC steel were adopted in this work to investigate the effect of rare earth on recrystallization behavior. The steels were annealed from 540℃ to 640℃（ every 20℃） after cold rolling by 71%,and annealing time was 10^2 s,10^2.5s,10～3 s,10^3.5s,10～4 s,respectively. Recrystallization microstructure of cold- rolled samples was analyzed by optical microscopy,grain size was measured by Image- tool software,and recrystallization activation energy of two kinds of steels was calculated by analyzing the recrystallization ratio at each temperature and time point. The result shows that RE can refine recrystallization grain and improve the recrystallization temperature and recrystallization activation energy. Under the experimental conditions,recrystallization activation energies for the tested steels with and without RE are 148 k J / mol 和 221 k J / mol,respectively.

关 键 词：CSP 稀土 微合金 再结晶激活能 

分 类 号：TG111.7[金属学及工艺—物理冶金]