铁素体基球铁的热变形行为
Hot Deformation Behavior of Ferrite Matrix Nodular Iron
赵 新1， 许 茜2， 荆天辅2
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作者单位：（1. 郑州航空工业管理学院 六系，河南 郑州 450015； 2.亚稳材料制备技术与科学国家重点实验室，河北 秦皇岛066004）
中文关键字：球铁； 热变形； 流变应力
英文关键字：nodular iron; hot deformation; flow stress
中文摘要：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0.001～1 s-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（0.001～0.01 s-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（0.1～1 s-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。
英文摘要：The hot deformation behavior of ferrite matrix nodular iron was investigated at strain rate range of 0.001～1s-l and temperature range of 700～1000 ℃ by hot compression test on a Gleeble3500 machine. The mathematical models of relations between flow stress and deformation parameters were constructed by linear regression. The results indicate that the flow stress decreases with the increase of temperature at a constant strain rate; the flow stress increases with the increase of strain rate at a certain temperature. The hot deformation behavior of nodular iron is similar to that of low carbon steel at the low strain rates（0.001～0.01 s-1）; however， the flow stress of nodular iron is significantly higher than that of low carbon steel at the high strain rates（0.1～1.0 s-1）. The hot deformation of ferrite matrix nodular iron is controlled by thermally activated processes.