40CrA钢高温流动应力研究  

A study of high temperature flow stress of 40CrA steel

作　　者：叶奔[1] 胡盛德[1] 胡灿[2] 

机构地区：[1]武汉科技大学材料与冶金学院钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081 [2]武汉船舶职业技术学院,湖北武汉430050

出　　处：《南方金属》2010年第5期16-18,共3页Southern Metals

基　　金：钢铁冶金及资源利用省部共建教育部重点实验室开放基金(FMRU2007Y01)

摘　　要：在THERMECMASTOR_Z热模拟实验机上,对40GrA钢进行高温热变形研究.变形温度取850～1 050℃,变形速率为1～60 s-1,变形程度为50%.根据实验所用钢种的类型和现阶段国内外研究的成果及经验公式,运用1stopt软件采用Marquardt算法对模型参数进行非线性回归,得出40GrA钢热变形流动应力数学模型.回归结果表明该数学模型具有良好的曲线拟合特性,用该模型计算得出的结果与实测值吻合较好,可以为40GrA钢的轧制工艺的制定及轧制力的计算提供理论依据.The high temperature deformation of 40CrA steel was investigated using the thermal simulation testing machine THERMECMASTOR_Z.The compression tests were carried out at deformation temperatures of 850～1 050 ℃,strain rates of 1～60 s-1,and deformation degree of 50%.Based on the experimental results,both at home and abroad,and empirical equations of the flow stress,a nonlinear regression was conducted using the 1stopts software and the Marquardt algorithm,which yields a mathematic model for the flow stress of the hot-deformed 40CrA steel.The results of the regression showed a good agreement with the experimental data,thus providing a good basis for formulating rolling procedure,and calculating roll force for hot rolling the steel.

关 键 词：40CrA钢 流动应力 数学模型 工艺参数 

分 类 号：TG142.1[一般工业技术—材料科学与工程]