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在Gleeble热模拟试验机上采用等温压缩实验研究了45钢的温变形行为。变形温度550~700℃,变形速率0.01~0.1 s-1。采用透射电镜研究了与变形现象有关的微观组织。结果显示:在550℃条件下淬火态试样的流变应力高于退火态试样的。但在600~700℃条件下,淬火态试样的流变应力在变形初期高于退火试样的,随后迅速降低,经过一段变形后退火态试样的流变应力反而更高。微观组织分析证实在温变形过程中淬火试样更易发生动态再结晶导致了上述现象。
The isothermal compression experiment was used to study the thermal deformation behavior of 45 steel on the Gleeble thermal simulator. Deformation temperature 550 ~ 700 ℃, deformation rate 0.01 ~ 0.1 s-1. Transmission electron microscopy was used to study the microstructure related to deformation. The results show that the flow stress of quenched samples at 550 ℃ is higher than that of annealed samples. But at 600-700 ℃, the flow stress of the quenched sample is higher than that of the annealed sample at the early stage of deformation, and then decreases rapidly. After a period of deformation, the flow stress of the annealed sample is even higher. The microstructure analysis confirmed that the dynamic recrystallization of the quenched sample during the warm deformation process caused the above phenomenon.