超低碳贝氏体钢的热加工特性分析  

Hot Working Characteristics of Ultra-low Carbon Bainite Steels

作　　者：夏文真[1] 赵宪明[1] 张晓明[1] 吴迪[1] 

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《轧钢》2013年第1期17-21,共5页Steel Rolling

基　　金：国家重点基础研究发展计划(973计划)(2010CB630801)

摘　　要：为研究超低碳贝氏体钢的热加工特性,在实验室热模拟试验机上分别进行了单道次压缩实验和双道次压缩实验。研究表明,该钢进行两阶段轧制时,在奥氏体再结晶区时应进行大压下低速轧制,在奥氏体未再结晶区时应进行快速轧制以缩短轧制周期;其奥氏体动态再结晶临界应变为εc=0.003712ε0.126118exp(48378.8667/T),且变形激活能为402.222kJ/mol;利用经过调整后的周纪华式流变应力模型进行非线性拟合,模型具有较高的可靠性;其奥氏体静态再结晶动力学方程为:FS=1-exp[-0.693(t/t0.5)0.232293],且静态再结晶激活能为394.852kJ/mol。To reveal the hot working characteristics of ultra-low carbon bainite steels, the compress during single and double passes was simulated using a MMS-300 thermal simulation testing apparatus. The results showthat high reduction and low speed rolling should be satisfied in the recrystallized austenite region, and high speed rolling can be carried out to shorten the rolling cycle in the non-recrystallized austenite region. The mod-el of dynamic recrystallization critical strain have been established εc=0.003712ε^0.126118 Sexp（48378. 8667/T）, deformation activation energy value is 402. 222 kJ/mol. The Zhoujihua＇s flow stress model which is modifiedappropriately has been adopted to fit out the experimental data. The model obtained is very reliable. In addi 0. 232293 tion, the kinetics equation of static recrystallization has been determined Fs=1-exp[-0.693（t/t0.5）^0.232293],and the static recrystallization activation energy is 394. 852kJ/mol.

关 键 词：超低碳贝氏体钢 动态再结晶 流变应力模型 静态再结晶 

分 类 号：TG142.1[一般工业技术—材料科学与工程]