Transactions of Materials and Heat Treatment

Title：Prediction on high temperature forming limit for Ti2AlNb alloy M-K theory based on internal variables

Authors： Liu Zhiqiang1 2 Wang Dongjun1 2 Liu Gang1 3

Unit： 1.National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of Technology 2.School of Materials Science and Engineering Harbin Institute of Technology 3.Institute of High Pressure Fluid Forming Harbin Institute of Technology

KeyWords： prediction of forming limit at high temperature Ti2AlNb alloy M-K theory internal variables microstructure

ClassificationCode：TG306

year,vol(issue):pagenumber：2022,47(12):240-248

Abstract：

During the high temperature deformation process of Ti2AlNb alloy, the microstructure evolution is complicated, which will lead to the change of mechanical properties and formability of alloy. Due to the coupling changes of microstructure and mechanical properties, it is more difficult to predict the forming limit at high temperature. Therefore, for this problem, the microstructure evolution during the deformation process and its influence on mechanical properties were coupled based on the M-K theory and the constitutive model of internal variables and M-K theory, the prediction model of forming limit for Ti2AlNb alloy at high temperature based on internal variables for Ti2AlNb alloy was established, and the forming limit of Ti2AlNb alloy sheet was calculated. When Ti2AlNb alloy sheet was formed at high temperature, the forming limit of sheet increased with the increasing of deformation temperature (950-985 ℃) and strain rate（0.001-0.1 s-1）. Therefore, strain softening was beneficial to improve the forming limit of sheet. Finally,the forming limit test was carried out under the conditions of the deformation temperature of 985 ℃ and the strain rate of 0.01 s-1, the theoretical calculation results were verified. Thus, the established prediction model of forming limit at high temperature has a good prediction effect.

Funds：

航天联合基金资助项目（U1937204）

刘志强（1990-），男，博士研究生 E-mail：lzhq241@163.com 通信作者：刘钢（1970-），男，博士，教授 E-mail：gliu@hit.edu.cn

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