TC18钛合金双道次热变形过程中微观组织及织构的演变规律  

Microstructure and texture evolution law of TC18 titanium alloy during double-pass hot deformation process

作　　者：李超 张松 蔺永诚[2] Li Chao;Zhang Song;Lin Yongcheng(Hunan Xiangtou Goldsky Titanium Industry Technology Co.,Ltd.,Changde 415004,China;School of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China;Light Alloy Research Institute,Central South University,Changsha 410083,China)

机构地区：[1]湖南湘投金天钛业科技股份有限公司,湖南常德415004 [2]中南大学机电工程学院,湖南长沙410083 [3]中南大学轻合金研究院,湖南长沙410083

出　　处：《锻压技术》2024年第7期81-89,共9页Forging & Stamping Technology

基　　金：国家重点研发课题(2022YFB3706902)。

摘　　要：采用Gleeble-3500D热模拟试验机及电子背散射衍射技术,进行了TC18钛合金双道次热变形实验和微观组织分析;详细研究了双道次热变形参数对TC18钛合金微观组织及织构演变规律的影响。结果表明:双道次热变形工艺参数显著影响合金的微观组织及织构分布;随着道次间保温时间的增加,原始β晶界附近析出大量的亚动态再结晶晶粒,使得动态再结晶分数增加;增加的温度和降低的应变速率有利于进一步提高合金的再结晶分数,从而细化其晶粒尺寸;晶粒细化过程受动态再结晶的影响,软化机制为动态回复和动态再结晶;合金中的织构以压缩丝织构、{012}<100>织构及立方织构为主。The double-pass hot deformation experiments and microstructural analysis of TC18 titanium alloy were carried out by thermal simulator Gleeble-3500D and electron back scatter diffraction technology,and the influence of parameters for double-pass hot deformation on the microstructure and texture evolution laws of TC18 titanium alloy were studied in details.The results indicate that the double-pass deformation process parameters significantly affect the microstructure and texture distribution.As the inter-pass holding time increases,some meta-dynamic recrystallization grains precipitate near the grain boundaries of originalβphases,resulting in increasing of dynamic recrystallization fraction.Increasing the temperature and decreasing the strain rate are beneficial for further improving the recrystallization fraction of alloy,and its grain size is refined.The grain refinement process is influenced by DRX,while the softening mechanisms are DRV and DRX.The textures in the alloy are mainly composed of compression fiber,{012}<100>and Cubic textures.

关 键 词：钛合金 双道次热变形 微观组织 织构 动态再结晶 

分 类 号：TG306[金属学及工艺—金属压力加工]