Constitutive modeling for high-temperature flow behavior of Ti-6242S alloy
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- 作者：Alireza Hajari ; hajari_alireza@mut.ac.ir ; hajari_alireza@yahoo.com ; Maryam Morakabati ; Seyed Mahdi Abbasi ; Hasan Badri
- 关键词：Ti-6242S alloy ; Thermomechanical processing ; Flow behavior ; Constitutive equation
- 刊名：Materials Science and Engineering: A
- 出版年：2017
- 出版时间：10 January 2017
- 年：2017
- 卷：681
- 期：Complete
- 页码：103-113
- 全文大小：1715 K
- 卷排序：681
文摘
The high-temperature deformation behavior of near-alpha Ti-6242S alloy was investigated at temperatures in the range of 850–1000 ℃℃ and at strain rates of 0.001-1 s−1s−1. The results indicated a difference in the flow stress behavior of the lower (T≤950℃T≤950℃) and upper (T=1000℃T=1000℃) parts of the two-phase alpha/beta region. Dynamic recovery and recrystallization of beta phase occur at 1000℃1000℃, while distortion and dynamic globularization of alpha phase are the dominant events, at temperatures lower than 950℃950℃. Flow behavior of the alloy was predicted through developing two phenomenological constitutive models, considering the coupled effects of deformation temperature, strain rate and strain. Furthermore, a comparative study was performed on the capability of the aforementioned models to predict the high-temperature flow behavior of the Ti-6242S alloy. Comparing the predicted average absolute relative error and correlation coefficient showed a more accurate flow behavior through Arrhenius-type equation against to the dynamic softening (Cingara) model. However, a novel approach was used to enhance the Cingara model and was verified with experimental result showing an increase in accuracy.