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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。
It is very important to study the microstructure evolution and static recrystallization behavior of CSP during the subsequent cold rolling annealing process. Taking ordinary low-carbon SPCC steel and rare earth-added low-carbon SPCC steel as the research object, the cold deformation after 71% cold recrystallization annealing at 560 ℃ to 640 ℃ (every 20 ℃), the annealing time were 10 ~ 2s, 10 ~ (2.5) s, 10 ~ 3s, 10 ~ (3.5) s, 10 ~ 4s. The microstructure of the cold-rolled and recrystallized samples was observed by optical microscope. The grain size of the microstructure was calculated by Image-tool software. The recrystallization activation energy of the two steels was calculated by analyzing the percentage of recrystallization at each temperature time. The results show that rare earth elements can refine the recrystallized grains and increase the recrystallization temperature and recrystallization activation energy. Under the experimental conditions, the recrystallization activation energies of unadditioned rare earth and rare earth are 148 kJ / mol and 221 kJ / mol, respectively.