A100钢的热变形行为及加工图  

Hot Deformation Behavior and Processing Map of A100 Steel

作　　者：张一帆 朱晓飞 周舸 和正华 张浩宇 陈立佳[1] 王瑞春 ZHANG Yi-fan;ZHU Xiao-fei;ZHOU Ge;HE Zheng-hua;ZHANG Hao-yu;CHEN Li-jia;WANG Rui-chun(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China;School of Intelligent Manufacturing,Weifang University of Science and Technology,Shouguang 262700,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870 [2]潍坊科技学院智能制造学院,山东寿光262700

出　　处：《精密成形工程》2022年第2期88-94,共7页Journal of Netshape Forming Engineering

摘　　要：目的研究A100钢的热变形行为,确定热加工范围并优化工艺参数。方法使用Gleeble-3800热模拟实验机,对A100钢进行应变为0.6,变形温度为1073~1473 K,应变速率为0.01~10 s;的等温热压缩实验。利用A100钢的热压缩实验数据,建立在不同变形温度、不同应变速率下的真应力-真应变曲线。建立A100钢基于唯象的本构模型与基于物理的本构模型以及基于Murty失稳准则的热加工图。结果当应变速率一定,温度升高或一定,应变速率下降时,A100钢的流变应力会减小,流变应力曲线上主要表现为动态再结晶的软化机制。结论构建的基于唯象的本构方程可以对A100钢在应变为0.6时的流变应力进行较好的预测,基于物理的本构方程可以反映出A100钢的物理特性,通过构建的基于Murty失稳准则的加工图可以得到A100钢的加工范围是温度为1173~1223 K,应变速率为0.01~0.1 s;和温度为1323~1373 K,应变速率为0.05~0.15 s;时。The work aims to study the hot deformation behavior of A100 steel and determine the hot processing range and optimize the process parameters. Gleeble-3800 thermal simulation testing machine was used to carry out an isothermal compression test with a strain of 0.6, a deformation temperature of 1073~1473 K, and a strain rate of 0.01~10 s;to the A100 steel.The data of hot compression test of A100 steel were adopted to establish the true stress-strain curve at different deformation temperature and different strain rates. Phenomenal-based constitutive model, physical-based constitutive model and hot processing map based on Murty instability criterion were established for A100 steel. When the strain rate was constant, the temperature increased or kept constant. When the strain rate decreased, the flow stress of A100 steel decreased, and the flow stress curve mainly showed the softening mechanism of dynamic recrystallization. The constructed phenomenal-based constitutive equation can better predict the flow stress of A100 steel at a strain of 0.6, and the physical-based constitutive equation can reflect the physical characteristics of A100 steel. Through the constructed processing map based on Murty instability criterion, it can be obtained that the processing range of A100 steel is temperature of 1173~1223 K and strain rate of 0.01~0.1 s;and temperature of 1323~1373 K and strain rate of 0.05~0.15 s;.

关 键 词：A100钢 热变形 本构模型 加工图 

分 类 号：TG142.41[一般工业技术—材料科学与工程]