上引连铸TU1热变形行为研究

Research on the hot deformation of upward continuous casting TU1

摘要: 以上引连铸TU1杆料为研究对象，在MMS-100热模拟试验机上对其进行单道次压缩试验，研究了在不同应变速率（0.01~10 s^-1）和不同变形温度（750~950 ℃）条件下的热变形行为，构建其本构模型.结果表明：在10 s^-1高应变速率条件下，TU1在750 ℃变形时峰值应力高达80 MPa，当温度升高到950 ℃时，峰值应力降至38 MPa；而在应变速率为0.01 s^-1、750 ℃变形时，峰值应力仅为30 MPa，此时TU1已经发生动态再结晶；通过本构方程计算得到TU1的热变形激活能约为253 kJ/mol.

Abstract: The MMS-100 thermal simulation tester was utilized to perform a single pass compression test on the TU1 at different strain rates (0.01~10 s^-1) and different deformation temperatures (750~950 ℃). And its thermal deformation was studied to construct the constitutive equation. The experimental results show that the peak stress is 80 MPa at 750 ℃, 10 s^-1. When the deformation temperature increases to 950 ℃, the peak stress decreases to 38 MPa. But the peak stress is only 30 MPa at 750 ℃, 0.01 s^-1, and TU1 has undergone dynamic recrystallization. According to the constitutive equation, the thermal deformation activation of TU1 is about 253 kJ/mol.