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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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

Received: 17 August 2021 Published: 22 December 2021

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TG146.23

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	Articles by authors
	LÜ Yaping
	ZOU Jindian
	ZHANG Hongling
	FAN Kai
	LI Chao
	ZHU Zhishou

Cite this article:

LÜ Yaping,ZOU Jindian,ZHANG Hongling, et al. 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.

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

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