TB17钛合金初生α相的析出激活能及TTT图  

Precipitated activation energy and TTT curves of primaryαphases in TB17 titanium alloy

作　　者：吕亚平 邹金佃 张宏岭 樊凯 李超 朱知寿[3] LÜYaping;ZOU Jindian;ZHANG Hongling;FAN Kai;LI Chao;ZHU Zhishou(Hunan Goldsky Titanium Industry Technology Co.,Ltd.,Changde 410015,China;Hunan Engineering Technology Research Center in Special Titanium Alloys for High-end Equipment,Changde 410015,China;Beijing Institute of Aeronautical Materials,Beijing 100095,China)

机构地区：[1]湖南金天钛业科技有限公司,常德410015 [2]湖南省高端装备特种钛合金工程技术研究中心,常德410015 [3]北京航空材料研究院,北京100095

出　　处：《粉末冶金材料科学与工程》2021年第6期500-506,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：湖南省科技厅高新技术产业科技创新引领计划(2020GK4018)。

摘　　要：通过组织观察和差热分析,研究TB17钛合金由单相区匀速降温(5 K/min)至两相区过程中初生α相,包括晶界α相(αGB)与魏氏体α相(αWGB)的析出行为和析出温度范围,确定两种α相析出的温度范围分别为1120~992 K和920~895 K。随后采用Avrami-Johnson-Mehl准则计算得出晶界α相的激活能Qαb=253.236 kJ/mol,魏氏体α相析出的激活能Qαi=503.188 kJ/mol,明确两种α相的析出动力学方程,并在此基础上构建了两种α相析出的TTT曲线。结果显示,两种α相的TTT曲线均呈C形,晶界α相析出的鼻尖温度在1023 K附近,魏氏体α相的鼻尖温度在905 K附近。The precipitation behavior and temperature range of grain boundaryαphase and Widmanstattenαphase during the process of uniform cooling(5 K/min)from single-phase region(5 K/min)to two-phase regionin TB17 titanium alloy were investigated by microstructure observation and differential thermal analysis.The temperature ranges of the two phases are determined to be 1120−992 K and 920−895 K,respectively.Then the Avrami-Johnson-Mehl criterion was adopted to calculate the activation energy of the two typeαphases and the results are Qαb=253.236 kJ/mol,and QαI=503.188 kJ/mol,and the precipitation kinetics equation of the two kinds ofαphase are acquired,subsequently.The TTT curves of two typeαphases are constructed based on the equation.According to the TTT curves results,the tip temperature of grain boundaryαand Widmanstattenαphase is about 1023 K and 905 K respectively.

关 键 词：超高强钛合金 时效热处理 TTT曲线 Α相 相析出激活能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]