EH40钢的热变形行为及流变应力模型  

THERMAL DEFORMATION BEHAVIOR AND FLOW STRESS MODEL OF EH40 STEEL

作　　者：金贺荣[1] 段昌新 戴超[1] JIN HeRong;DUAN ChangXin;DAI Chao(Key Laboratory of Advanced Forging&Stamping Technology and Science of Ministry of National Education,Parallel Robot and Mechatronic System Laboratory of Hebei Province,Yanshan University,Qinhuangdao 066004,China)

机构地区：[1]燕山大学先进锻压成型技术与科学教育部重点实验室,河北省并联机器人与机电系统实验室,秦皇岛066004

出　　处：《机械强度》2020年第2期426-430,共5页Journal of Mechanical Strength

基　　金：国家自然科学基金委员会-宝钢集团有限公司钢铁联合研究基金资助(U1660111);河北省高等学校科学技术研究项目(ZD2017076)资助。

摘　　要：为研究热加工过程中变形参数对EH40船板钢流变应力的影响规律,利用Gleeble—3800实验机对试样进行热模拟压缩实验,获得了EH40船板钢在应变率为0.1 s-1~10 s-1和变形温度为900℃~1200℃条件下的真应力-应变曲线,分析曲线得出:变形温度和应变速率均对EH40船板钢的动态再结晶和动态回复产生重要影响,升高变形温度或降低应变速率,均有利于变形过程中动态再结晶的发生,有助于材料的晶粒细化。采用包含Zene-Hollomon参数的双曲正弦模型,获得了该材料的热变形方程、热变形激活能、Z参数数学模型。经验证,所建立的本构关系计算值与实验值平均相对误差为3.13%,能够很好地反应EH40船板钢的实际热变形行为特征。In order to study the effect of deformation parameters on the flow stress of EH40 steel plate during hot working,using Gleeble-3800 tester to perform thermal compression simulation of specimen,the true stress-strain curve of EH40 shipboard steel under temperature conditions of 0.1 s-1~10 s-1 strain rate and 900℃~1200℃is obtained.By analyzing the curve,we find that deformation temperature and strain rate all have important effects on the dynamic recrystallization and dynamic recovery of EH40 plate steel,increasing the deformation temperature or reducing the strain rate is conducive to the occurrence of dynamic recrystallization during deformation,which contributes to grain refinement of the material.A hyperbolic sine model with ZeneHollomon parameters is adopted,the thermal deformation equation,activation energy of thermal deformation,and mathematical model of Z parameters were obtained.It is verified that the average error between the calculated value and the experimental value of the established constitutive relation is 3.13%,which can well reflect the actual hot deformation behavior of EH40 ship-board steel.

关 键 词：EH40船板钢 热压缩变形 流变应力 本构方程 

分 类 号：TG113[金属学及工艺—物理冶金]