Effect of Zr on static recrystallization kinetics of deformed austenite and precipitates in Ti-Mo composite microalloyed steel

doi:10.13251/j.issn.0254-6051.2022.02.008

Abstract

Abstract: Through two-pass compression simulation experiment on the Gleeble-3500 thermal simulation test machine, the static recrystallization process of deformed austenite of Ti-Mo microalloyed steel and Ti-Zr-Mo microalloyed steel at four deformation temperatures of 875, 925, 975 and 1025 ℃ was studied. The true stress-true strain curves of the two kinds of tested steels during two-pass compression simulation were analyzed. The static recrystallization kinetic models of the tested steels were established. The austenite static recrystallization activation energy of the tested steels was calculated. After two-pass compression at different temperatures, the morphologies and types of the deformation-induced precipitated phase and the large-particle undissolved phase in the tested steels were observed by a high-resolution transmission electron microscope. And the deformation energy storage density in the tested steels was simply compared. The results show that the addition of Zr can increase the deformation resistance of Ti-Mo microalloyed steel during deformation, increase the accumulated deformation storage energy during the hot deformation, reduce the static recrystallization activation energy of deformed austenite, and make the recrystallization of austenite easier to occur. Zr can replace Ti to form the undissolved phase with O, S and other elements, so that finer and more dispersed deformation-induced precipitates in the tested steel are precipitated during static recrystallization, and the static recrystallization process of deformed austenite of the tested steel is delayed.

Key words: Ti-Zr-Mo microalloyed steel, static recrystallization, deformation-induced precipitate

CLC Number:

TG142

Hao Tianci, Wu Yonghao, Yin Shubiao, Cao Jianchun, Luo Hanyu. Effect of Zr on static recrystallization kinetics of deformed austenite and precipitates in Ti-Mo composite microalloyed steel[J]. Heat Treatment of Metals, 2022, 47(2): 41-47.

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