Measurement of SH-CCT curves of TC4-DT titanium alloy

doi:10.13251/j.issn.0254-6051.2020.05.030

Abstract

Abstract: The transformation temperature T_β of TC4-DT titanium alloy was measured by metallographic method, and verified by thermal expansion method. According to the expansion curves at different cooling rates, the SH-CCT curves of the TC4-DT titanium alloy were plotted by means of metallographic analysis and hardness test. The results show that the transformation temperature of the TC4-DT titanium alloy is (945±5) ℃. When the cooling rate is less than 10 ℃/s, the α phase transformed from β phase is clustered with different orientations, and the net basket-like α phase appears. The microstructure is composed of martensite α phase and massive α_m phase when the cooling rate is greater than 10 ℃/s. As the cooling rate exceeds 100 ℃/s, the martensite α′ phase is formed. The start temperature and the finish temperature of martensite transformation in the TC4-DT titanium alloy are 836 ℃ and 760 ℃, respectively.

Key words: TC4-DT titanium alloy, thermal expansion method, SH-CCT curves, microstructure, phase transformation

CLC Number:

TG146.23

Zhao Dong, Dong Wenchao, Jiao Qingyang, Quan Chunyi, Lu Shanping. Measurement of SH-CCT curves of TC4-DT titanium alloy[J]. Heat Treatment of Metals, 2020, 45(5): 157-160.

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