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通过Gleeble-1500D型热模拟试验机,测定了Ti-IF钢和Ti+Ce-IF钢在变形温度为790、950℃,变形速率为0.1、1、5和10 s~(-1)时的应力-应变曲线;并使用金相显微镜对空冷后的变形组织进行观察。结果表明:Ce不改变变形速率对IF钢流变应力和显微组织的影响规律;Ti-IF钢和Ti+Ce-IF钢在790℃和950℃变形时,流变应力均随变形速率的增大而增大,Ti+Ce-IF钢的流变应力值比Ti-IF钢高;变形速率越高,晶粒变得越粗大;低温变形时,晶粒中伴有纤维状组织,呈现出轧制态晶粒特征;在790℃、0.1 s~(-1)变形时,Ti-IF钢和Ti+Ce-IF钢均易于获得均匀的晶粒组织,有助于提高综合力学性能的稳定性。
The deformations of Ti-IF steel and Ti + Ce-IF steel at deformation temperature of 790 and 950 ℃ and deformation rates of 0.1, 1, 5 and 10 s ~ (-1) were measured by Gleeble-1500D thermal simulation test machine Stress-strain curve; and the use of a metallographic microscope to observe the air-cooled deformed tissue. The results show that the influence of deformation rate on flow stress and microstructure of IF steel is not affected by Ce deformation. The flow stress of Ti-IF steel and Ti + Ce-IF steel at 790 ℃ and 950 ℃ are both dependent on the deformation rate , The flow stress value of Ti + Ce-IF steel is higher than that of Ti-IF steel; the higher the deformation rate, the more coarse the grains become; at low temperature deformation, the grains are accompanied by fibrous structure, presenting In the condition of deformation at 790 ℃ and 0.1 s ~ (-1), Ti-IF steel and Ti + Ce-IF steel are easy to obtain uniform grain structure, which is helpful to improve the mechanical properties stability.