温度对拉拔态AZ31镁合金丝材再结晶退火行为的影响  

Effect of Temperature on Recrystallization Annealing Behavior of Drawn AZ31 Magnesium Alloy Wire

作　　者：房文斌[1] 王东伟 张旭东 王辛 李学问[1] FANG Wen-bin;WANG Dong-wei;Zhang Xu-dong;WANG Xin;LI Xue-wen(School of Electric and Engineering,Harbin University of Science and Technology,Harbin 150040,China;XCMG Earth Moving Machinery Business Unit,Material Praparation Factory,Xuzhou 221000,China)

机构地区：[1]哈尔滨理工大学材料科学与工程学院,黑龙江哈尔滨150040 [2]徐工铲运机械事业部下料分厂,江苏徐州221000

出　　处：《哈尔滨理工大学学报》2019年第5期19-22,共4页Journal of Harbin University of Science and Technology

基　　金：国家自然科学基金(51775150,51804091);哈尔滨市应用技术研究与开发项目(2017RAQXJ009);黑龙江省大学生创新创业训练计划项目(201810214018)

摘　　要：以直径1.3 mm、变形程度25%的拉拔态AZ31镁合金丝材为原材料,研究温度对丝材再结晶退火行为的影响规律。结果表明:200℃退火后,丝材组织由细小再结晶晶粒与粗大变形态晶粒组成,退火温度为250℃及以上时,形成完全再结晶组织;随退火温度的增加,小尺寸再结晶晶粒数量先增多后减少,平均晶粒尺寸先减小后增大。温度增加至250℃及以上时,晶粒尺寸分布从双峰型变为单峰型,单位面积的细晶数目显著减少,晶粒尺寸分布的峰值不断右移增大。丝材再结晶过程分为典型3个阶段:细小等轴晶形成、细晶快速长大与晶粒均匀化阶段。In this paper,the tensile state AZ31 magnesium alloy wire with diameter of 1.3 mm and deformation degree of 25%was used as raw material to study the influence of temperature on recrystallization annealing behavior of wire.The results show that after annealing at 200℃,the microstructure consists of fine recrystallized grains and coarsely deformed grains.When the annealing temperature is 250℃and above,complete recrystallized structure is formed.With the increase of annealing temperature,small size recrystallization,the number of grains increases first and then decreases,and the average grain size decreases first and then increases.When the temperature increases to 250℃and above,the grain size distribution changes from bimodal to unimodal,and the number of fine particles per unit area significanly decreases,and the peak of the grain size distribution increases continuously to the right.The wire recrystallization process is divided into three typical stages:fine equiaxed crystal formation,fine crystal growth and grain uniformization.

关 键 词：AZ31丝材 温度 退火 再结晶 显微组织 

分 类 号：TG156.21[金属学及工艺—热处理]