82B高碳钢临界应变的数学模型  

Mathematical Model of Critical Strain to 82B High Carbon Steel

作　　者：刘丹[1] 杭乃勤[1] 黄灿[1] 

机构地区：[1]武汉科技大学冶金学院,武汉430081

出　　处：《特殊钢》2004年第4期19-20,共2页Special Steel

摘　　要：在EttoreAnelli提出的热轧控冷线棒材临界应变模型的基础上 ,用Thermecmaster Z热模拟试验机得出成分为 (% ) :0 82C 0 6Mn 0 1Cr的 82B钢在原始晶粒直径 4 7～ 12 4 μm ,变形温度 90 0～10 5 0℃和变形速率 (0 1～ 2 5 ) s时的应力 应变曲线 ,并按照所确定的临界应变模型系数 ,建立了 82B高碳钢的临界应变模型ε=0 0 1d0 .1 772 830 ε·exp(16 5 2 82 .1RT ) 0 .1 42 72 2　　。结果表明 ,随热变形温度的增高 ,应变速率的减小和原始晶粒细小 ,钢更易进行动态再结晶 ,温度和应变速率的影响较钢中原始晶粒尺寸对钢的动态再结晶的影响更大。模型计算值和实验测量值相一致。Based on the model of critical strain to hot rolling and controlled cooling of wire rods and bars established by Ettore Anelli, stress-strain curves of 0.82C-0.6Mn-0.1Cr steel 82B with grain diameters 47～124 μm, deformed temperature 900～ 1 050 ℃ and deforming rate (0.1～25)/s have been obtained by Thermecmaster-Z thermal simulation test machine. The mathematical model of critical strain to steel 82B: ε =0.01d 0.177283 0ε· exp(165282.1RT) 0.142722 has been established. The test results showed that with increasing deforming temperature, decreasing strain rate and fining original grain size the dynamic recrystallization of steel developed easier and the effect of temperature and strain rate on dynamic recrystallization were higher than that of original grain size. The calculated data by model conformed with the measured data by test.

关 键 词：高碳钢 变形温度 应变速率 临界应变模型 数学模型 热模拟试验机 

分 类 号：TG111[金属学及工艺—物理冶金]