Precipitated activation energy and TTT curves of primary α phases in TB17 titanium alloy
LÜ Yaping1,2, ZOU Jindian1,2, ZHANG Hongling1,2, FAN Kai1,2, LI Chao1,2, ZHU Zhishou3
1. Hunan Goldsky Titanium Industry Technology Co., Ltd., Changde 410015, China; 2. Hunan Engineering Technology Research Center in Special Titanium Alloys for High-end Equipment, Changde 410015, China; 3. Beijing Institute of Aeronautical Materials, Beijing 100095,China
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 Qαb=253.236 kJ/mol, and QαI= 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.
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