首页|Flow behavior and dynamic transformation of bimodal TC17 titanium alloy during high strain rate hot compression
Flow behavior and dynamic transformation of bimodal TC17 titanium alloy during high strain rate hot compression
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NSTL
Elsevier
The flow behavior and dynamic transformation of near beta TC17 alloy with a bimodal structure were investigated by hot compression with the high strain rate range from 1 s-1 to 20 s-1 and in the temperature range from 840 degrees C to 900 degrees C in this study. The most evident discontinuous yielding and post strain hardening occur at 840 degrees C-20 s(-1 )due to its high alpha p volume fraction before compression and the subsequent strong work hardening effect. High strain rate can slightly promote dynamic transformation when alloy is compressed at 840 degrees C and 870 degrees C due to domination of the high flow stress and temperature raising. However, more dramatic dynamic transformation is obtained for 1 s(-1) at 900 degrees C because the deformation heating at higher temperature/lower strain rate is less evident, and the deformation time thus maters more greatly on the phase transformation. The fine alpha s shows an obvious phase transformation priority than the coarse alpha p under all conditions due to the enhanced alloy element (Al) diffusivity resulting from enlarged alpha/beta interface and higher dislocation (diffusion channel) density around it. The alpha p promotes the dynamic re crystallization of beta phase while this effect becomes weaker when dynamic transformation is progressed greatly, mainly due to the inevitable stored energy consumption and reduced alpha p volume fraction caused by phase transformation. (C) 2022 Elsevier B.V. All rights reserved.
NSTL
Elsevier
