论文部分内容阅读
采用Gleeble-3500热模拟试验机研究微合金超高强度复相钢(CP钢)在变形温度为900～1150℃、应变速率为0.1～10 s-1条件下的热变形行为,观察了不同变形条件下的晶粒组织。根据实验结果,建立了CP钢在热变形过程中的本构方程及动态再结晶过程的物理模型。实验结果表明,微合金元素钛的存在,明显抑制了动态再结晶的发生,提高了变形激活能,其值为439.09 kJ/mol。另外,热变形参数对最终的晶粒大小具有重要影响,随着再结晶变形温度的降低及应变速率的提高,晶粒尺寸明显减小。本构方程、动态再结晶模型能为科学设计和有效控制CP钢的热加工工艺提供依据。
The thermal deformation behavior of microalloyed super high strength duplex steel (CP steel) under the deformation temperature of 900 ~ 1150 ℃ and the strain rate of 0.1 ~ 10 s-1 was studied by Gleeble-3500 thermal simulation test machine. Under the conditions of the grain structure. According to the experimental results, the constitutive equation of CP steel during hot deformation and the physical model of dynamic recrystallization are established. The experimental results show that the presence of microalloying titanium significantly inhibits the dynamic recrystallization and increases the deformation activation energy, which is 439.09 kJ / mol. In addition, the thermal deformation parameters have an important influence on the final grain size. With the decrease of recrystallization temperature and the increase of strain rate, the grain size decreases obviously. The constitutive equation and dynamic recrystallization model can provide the basis for scientific design and effective control of CP steel thermal processing technology.