10% Cr/Cu复合材料的热变形行为及再结晶动力学模型  

Flow behavior and dynamic recrystallization model for 10% Cr/Cu composite during hot deformation

作　　者：刘勇[1,2] 耿昊[3] 朱顺新[1] 田保红[1,2] 张毅[1,2] 顾正彬 LIU Yong1,2, GENG nao3 , ZHU Shun-xin1 , TIAN Bao-hong1,2 , ZHANG Yi1,2, GU Zheng-bin4(1. School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China; 2. Henan Key Laboratory of Non-ferrous Materials Science and Processing Technology, Luoyang 471023, China ; 3. The 713th Research Institute of China Shipbuilding Industry Corporation, Zhengzhou 450015, China ; 4. Department of Materials Science and Engineering, Naniing University, Nanjing 210093, China)

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023 [2]河南省有色金属材料科学与加工技术重点实验室,河南洛阳471023 [3]中国船舶重工集团公司第七一三研究所,河南郑州450015 [4]南京大学材料科学与工程系,江苏南京210093

出　　处：《材料热处理学报》2018年第9期113-119,共7页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(U1704143);河南省科技开放合作项目(182106000018)

摘　　要：利用Gleeble-1500D型热模拟试验机在变形温度为650-950℃、应变速率为0.001-1 s^-1、变形量为60%的条件下对10%Cr/Cu复合材料进行热模拟压缩试验。依据热模拟实验数据,绘制出10%Cr/Cu复合材料的流变应力曲线,分析变形温度、应变速率对流变应力的影响。用线性回归法确定出10%Cr/Cu复合材料的热变形激活能（Q）和高温变形本构关系模型,并引入应变对模型进行修正,最后通过误差分析验证了方程的可靠性。结果表明：10%Cr/Cu复合材料的流变应力随温度的升高和应变速率的降低而减少;计算得出10%Cr/Cu复合材料的热变形激活能为260.7 kJ/mol;建立了复合材料的本构方程,对构建的本构方程模型进行误差验证得出平均相对误差为7.39%;利用Avrami模型求出了复合材料的动态再结晶分数模型,该模型表明在高温和较低应变速率条件下有利于该材料发生动态再结晶。Hot simulation compression tests of 10% Cr/Cu composite were carried out by using a Gleeble-1500 D thermal-mechanical simulation test machine under the condition of deformation temperature of 650-950 ℃,strain rate of 0. 001-10 s^-1 and deformation of60%. Based on the experiment data of hot simulation,the flow stress curve of the 10% Cr/Cu composite was obtained,and the influences of deformation temperature and strain rate on the flow stress were discussed. The thermal deformation activation energy（ Q） and the constitutive relation model of high temperature deformation of the composites were determined by using linear regression method,and the strain was introduced to modify the model. Finally,the reliability of the equation was verified by error analysis. The results show that the peak stress decreases with the decreasing of strain rate and the increasing of the deformation temperature. The thermal deformation activation energy of the 10% Cr/Cu composite is 260. 7 kJ/mol. The constitutive equation of the composites is established,and the average relative error between the calculation and experimental results is 7. 39%. The dynamic recrystallization fraction model of the composite is obtained by using the Avrami model. It shows that the high temperature and the low strain rate are beneficial to the dynamic recrystallization of the composites.

关 键 词：10%Cr/Cu复合材料 流变应力 本构方程 再结晶动力学模型 

分 类 号：TB331[一般工业技术—材料科学与工程]