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.
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[J]. Materials Science and Engineering of Powder Metallurgy, 2021
, 26(6)
: 500
-506
.
DOI: 10.19976/j.cnki.43-1448/TF.2021069
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