HPS485wf桥梁钢奥氏体动态再结晶规律及其本构关系模型  

Dynamic recrystallization and mathematical model of HPS485wf steel

作　　者：王丽君[1,2] 关小军[1,2] 赵健[1,2] 禹宝军[1,2] 曾庆凯[1,2] 孙琴[1,2] 刘千千[1,2] 

机构地区：[1]山东大学材料液固结构演变与加工教育部重点实验室,山东济南250061 [2]山东大学材料科学与工程学院,山东济南250061

出　　处：《材料热处理学报》2010年第10期147-151,共5页Transactions of Materials and Heat Treatment

基　　金：高等学校博士点专项科研基金(200804220021);山东省自然科学基金(Y2007F06);山东省国际科技合作计划项目(2006013)

摘　　要：采用热模拟试验、动态再结晶唯象理论和回归分析,研究了HPS485wf桥梁结构钢在温度为1273～1473 K,变形速率为0.1～10 s-1条件下热压缩变形的动态再结晶行为。分析了流变应力的变化规律和加工硬化率-应变图;判断了该钢发生动态软化的类型;得到了形变激活能和临界参数与温度补偿应变速率因子Z之间的关系;建立了相应的高温变形本构关系方程。To discover the dynamic recrystallization behaviour of HPS485wf steel at temperature of 1273-1473 K and strain rate of 0.1-10 s-1,compression tests were carried out on a MMS-300 thermal simulator and the results were analyzed through dynamic recrystallization phenomenological theory and regression analysis.The change of flow stress,the plots of work-hardening rate versus strain and the dynamic softening patterns for this steel were examined.By fitting the experimental data,the deformation activation energy and relationship between critical parameters and Z parameter were obtained and a corresponding constitutive equation was established.

关 键 词：HPS485wf钢 奥氏体 动态再结晶 本构方程 变形激活能 

分 类 号：TG142.41[一般工业技术—材料科学与工程]