Jia Zhi, Gao Zexi, Ji Jinjin, Liu Dexue, Guo Tingbiao, Ding Yutian
State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China.
School of Material Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China.
Materials (Basel). 2019 Feb 8;12(3):510. doi: 10.3390/ma12030510.
High-temperature compression and electron backscatter diffraction (EBSD) techniques were used in a systematic investigation of the dynamic recrystallization (DRX) behavior and texture evolution of the Inconel625 alloy. The true stress⁻true strain curves and the constitutive equation of Inconel625 were obtained at temperatures ranging from 900 to 1200 °C and strain rates of 10, 1, 0.1, and 0.01 s. The adiabatic heating effect was observed during the hot compression process. At a high strain rate, as the temperature increased, the grains initially refined and then grew, and the proportion of high-angle grain boundaries increased. The volume fraction of the dynamic recrystallization increased. Most of the grains were randomly distributed and the proportion of recrystallized texture components first increased and then decreased. Complete dynamic recrystallization occurred at 1100 °C, where the recrystallized volume fraction and the random distribution ratios of grains reached a maximum. This study indicated that the dynamic recrystallization mechanism of the Inconel625 alloy at a high strain rate included continuous dynamic recrystallization with subgrain merging and rotation, and discontinuous dynamic recrystallization with bulging grain boundary induced by twinning. The latter mechanism was less dominant.
采用高温压缩和电子背散射衍射（EBSD）技术，对Inconel625合金的动态再结晶（DRX）行为和织构演变进行了系统研究。在900至1200℃的温度范围以及10、1、0.1和0.01 s⁻¹的应变速率下，获得了Inconel625合金的真应力-真应变曲线和本构方程。在热压缩过程中观察到了绝热加热效应。在高应变速率下，随着温度升高，晶粒先细化后长大，高角度晶界比例增加，动态再结晶体积分数增大。大部分晶粒随机分布，再结晶织构组分比例先增加后减小。在1100℃发生完全动态再结晶，此时再结晶体积分数和晶粒随机分布比例达到最大值。该研究表明，Inconel625合金在高应变速率下的动态再结晶机制包括亚晶合并和旋转的连续动态再结晶，以及孪生诱发晶界鼓胀的不连续动态再结晶，后者机制的主导性较弱。
