TB17钛合金初生α相的析出激活能及TTT图

doi:10.19976/j.cnki.43-1448/TF.2021069

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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(α_GB)与魏氏体α相(α_WGB)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1 120~992 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Q_αb= 253.236 kJ/mol,魏氏体α相析出的激活能Q_αi=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1 023 K附近,魏氏体α相的鼻尖温度在905 K附近。

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	吕亚平
	邹金佃
	张宏岭
	樊凯
	李超
	朱知寿

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

Abstract：The precipitation behavior and temperature range of grain boundary α phase and Widmanstatten α phase 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 1 120-992 K and 920-895 K, respectively. Then the Avrami-Johnson-Mehl criterion was adopted to calculate the activation energy of the two type α phases and the results are Q_αb=253.236 kJ/mol, and Q_αI= 503.188 kJ/mol, and the precipitation kinetics equation of the two kinds of α phase are acquired, subsequently. The TTT curves of two type α phases are constructed based on the equation. According to the TTT curves results, the tip temperature of grain boundary α and Widmanstatten α phase is about 1 023 K and 905 K respectively.

Key words： ultra high strength titanium alloy aging treatment TTT curves α phase precipitation activation energy

收稿日期: 2021-08-17 出版日期: 2021-12-22

ZTFLH:

TG146.23

基金资助:湖南省科技厅高新技术产业科技创新引领计划(2020GK4018)

通讯作者: 樊凯,正级高级工程师,博士。电话：18108463609;E-mail: fk@xtjtty.com

引用本文:

吕亚平, 邹金佃, 张宏岭, 樊凯, 李超, 朱知寿. TB17钛合金初生α相的析出激活能及TTT图[J]. 粉末冶金材料科学与工程, 2021, 26(6): 500-506.
LÜ Yaping, ZOU Jindian, ZHANG Hongling, FAN Kai, LI Chao, ZHU Zhishou. Precipitated activation energy and TTT curves of primary α phases in TB17 titanium alloy. Materials Science and Engineering of Powder Metallurgy, 2021, 26(6): 500-506.

链接本文:

http://pmbjb.csu.edu.cn/CN/10.19976/j.cnki.43-1448/TF.2021069 或 http://pmbjb.csu.edu.cn/CN/Y2021/V26/I6/500

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