等通道转角挤压工艺对Ti-1023合金显微组织的影响  

Effect of Equal-channel Angular Pressing on Microstructure of Ti-1023 Alloy

作　　者：袁士翀 刘延辉[2] 宁永权[2] 姚泽坤[2] 赵张龙[2] 郭鸿镇[2] 

机构地区：[1]中国二重万航模锻公司,四川德阳618000 [2]西北工业大学材料科学与工程学院,陕西西安710072

出　　处：《热加工工艺》2016年第11期71-75,共5页Hot Working Technology

摘　　要：试验研究了不同温度以及不同挤压次数下Ti-1023合金经等通道转角挤压后组织演变规律。结果表明:挤压温度对微观组织有显著影响。在相变点以下挤压时,可以得到细小均匀的组织,且组织中含有大量的等轴α相;在相变温度以上挤压时,细小等轴β晶粒迅速长大,多次挤压并不能有效地细化β晶粒。此外,挤压次数对合金的组织演变也有较大影响,为了获得比较均匀细小的组织,挤压次数不宜过多。采用750℃挤压温度+标准热处理+4次挤压的工艺可以得到细小均匀的组织。The microstructure evolution law of Ti-1023 alloy after equal channel angular extrusion was studied under different temperatures and extrusion times. The results indicate that extrusion temperature has a significant effect on the microstructure of Ti-1023 alloy. When the extrusion is below the temperature of phase transformation, the fine and uniform microstructure can be gotten, and it has a great number of equiaxial α phase; when the extrusion is above the temperature of phase transformation, the fine and equiaxial β grains grow up quickly, and the multiple extrusion cannot effectively refine theβ grains. In addition, the extrusion time also has a great effect on the microstructure evolution of Ti-1023 alloy. In order to obtain fine and uniform microstructure, the extrusion time is not too much. Using the extrusion temperature of 750 ℃,standard heat treatment and 4 times of extrusion can get the fine and uniform microstructure.

关 键 词：TI-1023合金 等通道转角挤压 挤压温度 挤压次数 微观组织 

分 类 号：TG379[金属学及工艺—金属压力加工]