S55C钢高温流变行为的本构模型  

Constitutive model of high-temperature rheological behavior for S66C steel

作　　者：周俞廷 郝庆乐 宋俊辉 俞鑫山 赵凯鹏 钟素娟 关常勇 龙伟民 Zhou Yuting;Hao Qingle;Song Junhui;Yu Xinshan;Zhao Kaipeng;Zhong Sujuan;Guan Changyong;Long Weimin(Ningbo Intelligent Machine Tool Research Institute Co.,Ltd.of China National Machinery Institute Group,Ningbo 315700,China;China Academy of Machinery Science and Technology Group Co.,Ltd.,Beijing 100044,China;Faculty of Mechanical Engineering&Mechanics,Ningbo University,Ningbo 315211,China;Shandong Solid Solder Co.,Ltd.,Feicheng 271600,China)

机构地区：[1]中国机械总院集团宁波智能机床研究院有限公司,浙江宁波315700 [2]中国机械科学研究总院集团有限公司,北京100044 [3]宁波大学机械工程与力学学院,浙江宁波315211 [4]山东索力得焊材股份有限公司,山东肥城271600

出　　处：《锻压技术》2025年第1期272-280,共9页Forging & Stamping Technology

摘　　要：基于Gleeble-3180热模拟试验机对S55C钢材展开变形温度为850~1000℃、应变速率为0.01~10 s^(-1)的等温流变压缩实验,研究了该材料的高温热变形行为;根据实验所得的真实应力-真实应变曲线,分析了真实应变、变形温度和应变速率对流动应力的影响规律,并建立了S55C钢材应变补偿后的Arrhenius本构模型,更进一步地对模型的拟合精度进行了分析。结果表明,S55C钢材热压缩变形过程的塑性变形部分可以分为3个阶段,变形初期,流动应力随应变的增加而急剧增大;变形中期,流动应力的增长速率减缓,材料加工硬化和动态软化相抗争,达到平衡后出现峰值应力;变形后期,流动应力在不同的应变速率下呈现不同的变化趋势,低应变速率下,流动应力呈现出下降的特征,热压缩变形中的软化形式以动态再结晶为主,而在高应变速率下,流动应力则在峰值应力范围内趋于稳定,软化形式主要为动态回复。对比分析材料本构模型的预测结果与实际实验所得数据,获得应变补偿的Arrhenius本构模型的相关系数为0.94844,平均绝对相对误差为8.76285%,说明该本构模型可以较好地描述S55C钢材的高温热变形行为。The isothermal rheological compression experiments of S55C steel material were conducted by thermo-mechanical simulator machine Gleeble-3180 at deformation temperature of 850-1000℃ and strain rate of 0.01-10 s^(-1),and the high-temperature hot deformation behavior of the material was studied.Then,based on the true stress-true strain curve obtained from the experiment,the influence laws of true strain,deformation temperature and strain rate on rheological stress were analyzed,and an Arrhenius constitutive model with strain compensation of S55C steel was established to analyze the fitting accuracy of the model further.The results show that the plastic deformation part in the hot compression deformation process of S55C steel can be divided into three stages.In the early deformation stage,the rheological stress increases sharply with the increasing of strain,the growth rate of rheological stress slows down in the middle stage of deformation,the material undergoes a struggle between work hardening and dynamic softening,resulting in peak stress after reaching equilibrium,and the rheological stress in the later stage of deformation shows different change trends under different strain rates.At low strain rate,the rheological stress shows the characteristics of decreasing,and the softening form in hot compression deformation is dominated by dynamic recrystalization,while at high strain rates,the rheological stress tends to stabilize within the peak stress range,and the softening form is mainly dynamic recovery.By comparing and analyzing the predicted results of the material constitutive model with the actual experimental data,the correlation coefficient of the Arrhenius constitutive model with strain compensation is 0.94844,and the average absolute relative error is 8.76285%,indicating that the constitutive model can well describe the high-temperature hot deformation behavior of S55C steel.

关 键 词：S55C钢材 Arrhenius本构模型 ZENER-HOLLOMON参数 热变形行为 应变速率 

分 类 号：TG142.1[一般工业技术—材料科学与工程]