β热处理条件与Ti-5321合金显微组织特征的关系研究  

Study on the Relationship Between Microstructure Characteristics and Beta Heat Treatment Conditions of Ti-5321 Alloy

作　　者：周伟[1] 赵永庆[1,2] 辛社伟[1] 李倩[1] 张思远[1] 王欢 蔡建华[1] Zhou Wei;Zhao Yongqing;Xin Shewei;Li Qian;Zhang Siyuan;Wang Huan;Cai Jianhua(Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China;Northwestern Polytechnical University,Xi’an 710072,China)

机构地区：[1]西北有色金属研究院,陕西西安710016 [2]西北工业大学,陕西西安710072

出　　处：《钛工业进展》2019年第3期13-16,共4页Titanium Industry Progress

基　　金：国家自然科学基金项目(51471136);国际科技合作项目(中法合作)(2015DFA51430)

摘　　要：研究了β热处理条件与新型高强韧Ti-5321合金显微组织特征的关系。结果表明,在860~920℃温度范围内热处理,Ti-5321合金显微组织为细小等轴β晶粒,同时保温时间越长,晶粒尺寸越均匀。自β相区缓慢冷却到(α+β)相区,α片层生长符合感生形核生长特征。β热处理后冷却速率和冷却时间对Ti-5321合金α片层集束尺寸和片层宽度影响较大,片层宽度随着冷却速率的增大基本呈线性减小,随冷却时间的延长呈现由缓慢增大到快速增大再到缓慢增大的规律。α片层集束尺寸在冷却速率为0.25~1℃/min时,随冷却速率的增大快速减小,冷却速率为1~2℃/min时,集束尺寸减小较为缓慢。The relationship between beta heat treatment conditions and microstructure characteristics of a new high strength and toughness titanium alloy Ti-5321 has been studied in this paper.The results show that,the microstructure is fine equiaxed beta grain of the alloy after heat treatment in the temperature range of 860~920 ℃.At the same time,the holding time is the longer,the more uniform of the grain size.The growth of the lamellar accords with the characteristics of induced nucleation growth when the alloy is cooling slowly from the beta phase region to the (alpha+beta) region.The cooling rate and cooling time after beta heat treatment have great influence on the α cluster size and lamellar width of the Ti-5321 alloy.The width of the lamellar decreases linearly with the increase of cooling rate,and increases from slow to rapid and then slowly with the cooling time.When the cooling rate is 0.25~1 ℃/min,the cluster size decreases rapidly with the increase of cooling speed,and the cluster size decreases slowly when the cooling rate is 1~2 ℃/min.

关 键 词：Ti-5321合金 冷却速率 显微组织 β热处理 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG166.5[金属学及工艺—金属材料]