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采用Gleeble3500热/力模拟试验机对铁素体基球铁在700～1000℃温度区间,应变速率0.001～1s-l之间进行了热压缩实验,研究了该材料的热变形行为。通过回归分析建立了流变应力与热变形参数相互关系的数学模型。结果表明:在应变速率一定的条件下,流变应力随温度的升高而降低;在变形温度一定的条件下,流变应力随应变速率的升高也增加。在低应变速率(0.001～0.01s-1)的情况下,球铁的热变形行为与低碳钢的相似;但在高应变速率(0.1～1s-1)的情况下,球铁的流变应力比低碳钢的明显偏高。铁素体基球铁热压缩变形受热激活过程控制。
The thermal deformation behavior of ferritic Fe-based ductile iron was investigated by using Gleeble 3500 heat / force simulator at a temperature range of 700-1000 ℃ and a strain rate of 0.001-1s-l. Through regression analysis, a mathematical model of the relationship between flow stress and thermal deformation parameters was established. The results show that the flow stress decreases with the increase of temperature at a certain strain rate. With the deformation temperature constant, the flow stress increases with the increase of strain rate. At low strain rate (0.001 ~ 0.01s-1), the thermal deformation behavior of ductile iron is similar to that of mild steel. However, at high strain rate (0.1 ~ 1s-1) The stress is obviously higher than that of mild steel. Hot-pressing ferrite-based ductile deformation is controlled by thermal activation process.