TC18钛合金相变点区域动态再结晶模型的建立  

Establishment of dynamic recrystallization model for TC18 titanium alloy near phase transition point

作　　者：门正兴[1] 屈仁春[1] 周杰[2] 马亚鑫 苏艳红[1] Men Zhengxing;Qu Renchun;Zhou Jie;Ma Yaxin;Su Yanhong(Mechanical and Electrical Engineering Department,Chengdu Aeronautic Polytechnic,Chengdu 610021,China;College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]成都航空职业技术学院机电工程学院,四川成都610021 [2]重庆大学材料科学与工程学院,重庆400044

出　　处：《锻压技术》2018年第10期162-166,共5页Forging & Stamping Technology

基　　金：国家自然科学基金面上项目(51275543);四川省教育厅资助项目(17ZB0035,18ZA0032)

摘　　要：为了研究TC18钛合金在β转变点附近区域热变形过程中的动态再结晶行为以及微观组织变化规律,利用热模拟设备Gleeble 1500对TC18钛合金β转变点附近的应力-应变曲线进行了测定,并采用金相显微镜对TC18钛合金高温压缩变形后的显微组织进行观察。采用六次多项式拟合方式对TC18钛合金应力-应变曲线进行光顺,然后结合加工硬化率曲线与材料应力-应变曲线确定材料不同情况下的临界应变εc、峰值应变εp以及稳态应变εs,并建立基于Zener-Hollomon参数的数学模型。应用Kopp模型建立TC18钛合金在β转变点附近区域的动态再结晶体积分数模型,并根据金相分析结果建立TC18钛合金的动态再结晶晶粒尺寸模型。In order to study the dynamic recrystallization behavior and microstructure change law of TC18 titanium alloy during the thermal deformation process near the β transition point,the true stress-strain curve near the β transition point of TC18 titanium alloy was measured by the thermal simulation equipment Gleeble 1500,and the microstructure of TC18 titanium alloy after high temperature compression deformation was observed by metallographic microscope. Then,the stress-strain curve of TC18 titanium alloy was smoothed by the sixth-order polynomial fitting,the critical strain ε_c,peak strain ε_pand steady-state strain ε_sunder different conditions of material were determined by combining the work hardening rate curve and the material stress-strain curve,and the mathematical model based on Zener-Hollomon parameters was established. Furthermore,the dynamic recrystallization volume fraction model of TC18 titanium alloy near the β transition point was established by Kopp model,and the dynamic recrystallization grain size model of TC18 titanium alloy was established according to the results of metallographic examination.

关 键 词：TC18钛合金 动态再结晶 ZENER-HOLLOMON参数 稳态应变 相变 

分 类 号：TG816[金属学及工艺—公差测量技术]