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通过Gleeble 1500D热力模拟实验机对HR3C奥氏体耐热钢进行单道次压缩试验,研究其高温变形行为。热变形温度为950~1250℃,应变速率范围0.001~1.0 s-1。结果表明,HR3C的流变应力随变形速率的降低和变形温度的升高而降低。变形温度越高,动态再结晶越容易发生;动态再结晶晶粒尺寸随温度的升高而增大,随变形速率的增大而减小。通过计算和回归分析得出HR3C钢的热激活能(558 k J/mol)和热变形本构方程;峰值应力与Z参数呈线性关系。
The single-pass compression test of HR3C austenitic heat-resistant steel was carried out by Gleeble 1500D thermodynamic simulation machine to study its high temperature deformation behavior. The thermal deformation temperature is 950 ~ 1250 ℃ and the strain rate range is 0.001 ~ 1.0 s-1. The results show that the flow stress of HR3C decreases with the decrease of deformation rate and the increase of deformation temperature. The higher the deformation temperature, the easier the dynamic recrystallization occurs. The dynamic recrystallization grain size increases with the increase of temperature and decreases with the increase of deformation rate. The thermal activation energy (558 kJ / mol) and thermal deformation constitutive equation of HR3C steel were obtained by calculation and regression analysis. The peak stress and Z parameter showed a linear relationship.