变形量对TC25钛合金饼坯组织和力学性能的影响  

Influence of Deformation on Microstructures and Mechanical Properties of TC25 Titanium Alloy Cake Billet

作　　者：史小云[1] 郝芳[1,2] 张晓园 雷锦文[1] 楼美琪[1,2] 王锦利 

机构地区：[1]西部超导材料科技股份有限公司特种钛合金材料制备技术国家地方联合工程实验室,陕西西安710018 [2]西北工业大学凝固技术国家重点实验室,陕西西安710072 [3]中国航发西安航空发动机有限公司,陕西西安710021

出　　处：《材料开发与应用》2017年第5期28-32,共5页Development and Application of Materials

基　　金：国家重点研发计划(2016YFB0701305);陕西省重点研发计划(S2017-ZDYF-YBXM-GY-0642)

摘　　要：将Ф240 mm TC25钛合金坯料在T_β+25℃温度下保温一段时间后锻制成饼坯,研究20%、40%和60%三种典型变形量对饼坯的组织和拉伸力学性能的影响。结果表明,三种变形量的饼坯显微组织均由多个平直的束状α相互相交错形成网篮组织;随着变形量的增加,平直的束状α相减少,α相方向性减弱,长条α相尺寸减小;同时,随着变形量的增加,拉伸强度增强。Mter maintained at Tβ ＋ 25 ℃ for a certain period of time, the φ240 mm TC25 titanium alloy bars were forged into cake billets with the deformations of 20% ,40% and 60%, and the microstructures and tensile mechanical properties of the TC25 titanium alloy cake billets were investigated. The results showed that the microstructures of the TC25 titanium alloy cake billets of different deformations were all basket weave structure with fiat fascicular α phases intertwining each other. With the in- crease of deformation, the number of the fiat fascicular α phases decreased, the orientation of α phases weakened and the size of strip α phases decreased. Meanwhile, as the deformation increased, the tensile strength of TC25 titanium alloy improved.

关 键 词：TC25钛合金 显微组织 力学性能 束状α相 

分 类 号：TG146.23[一般工业技术—材料科学与工程]