DP780双相钢动态再结晶动力学研究  

Dynamic recrystallization kinetics of DP780 dual phase steel

作　　者：王志蒙 王宇璞 尹起 李辉[1,2] WANG Zhi-meng;WANG Yu-pu;YIN Qi;LI Hui(Material Department in College of Engineering,Yantai Nanshan University,Yantai 265713,China;National Engineering Research Center for Plastic Working of Aluminum Alloys,Shandong Nanshan Aluminum Co., Yantai 265700,China)

机构地区：[1]烟台南山学院工学院材料系,山东烟台265713 [2]山东南山铝业股份有限公司国家铝合金压力加工工程技术研究中心,山东烟台265700

出　　处：《塑性工程学报》2018年第6期194-201,共8页Journal of Plasticity Engineering

基　　金：山东省自然科学基金资助项目(ZR2016EMP05)

摘　　要：利用Gleeble-3500热模拟试验机对DP780双相钢进行单道次热压缩试验,研究其在变形温度950~1150℃、应变速率0.05~10s^-1。下的再结晶动力学行为,建立了修正的Stewart动力学模型,并分析了不同变形条件对材料显微组织演变的影响规律。结果表明:应变速率对试验钢热变形行为影响较大,在变形温度950~1150℃,应变速率0.05~0.1s^-1时,材料发生了明显的动态再结晶现象;试验钢动态再结晶显微组织演变过程为锯齿状晶界(εc)-项链组织(εm)-等轴晶(εm)。相比于Kim模型与Sellars模型,修正的Stewart模型能更好的描述试验钢的再结晶动力学行为,计算值与试验值的最大相对误差与平均相对误差均降低40%以上,相关系数R为0.988。Recrystallization kinetic of DP780 dual phase steel was studied by single pass heat compression test at temperature of 950- 1150℃ and strain rate of 0.05-10s^-1 on Gleeble-3500thermal-mechanical simulator,a modified Stewart dynamic model was estab-lished,and the influence of deformation conditions on microstructure evolution of the test steel was analyzed.The restflts show that hot deformation behavior is more sensitive to the strain rates.The dynamic recrystallization occurs at temperature of 950-1150℃ and strain rates of 0.05-0.1s^-1.The microstructure evolution process during hot deformation is serrated grain boundary (εc)-necklace structure (εm)-equiaxed crystal (εas).Compared with Kim model and Sellars model,the modified Stewart model can better describe the recrystallization kinetics of the test steel.The maximum relative error and the average relative error of the modified Stewart model are at least 40% lower than that of the Kim model and the Sellars model,and the correlation coefficient is 0.988.

关 键 词：双相钢 再结晶动力学 显微组织 Stewart动力学模型 

分 类 号：TG142[一般工业技术—材料科学与工程]