利用Gleeble 1500型热模拟试验机进行单向热压缩实验, 借助金相分析技术、 扫描电镜技术等手段研究了3种碳含量基本相同、Mn含量不同的低碳钢在变形 温度分别为700和600 ℃、应变速率分别为10 -3 s -1---10 1 s -1条件下的热变形行为以及组织演变规律, 分析了Mn含量对低碳钢中铁素体动态再结晶行为的影响. 结果表明：本实验所用3种低碳钢中的铁素体在一定变形条件下均发生了动态再结晶, 但Mn含量越低, 发生动态再结晶的工艺范围越宽. Mn对钢中铁素体动态再结晶的影响主要表现在: Mn含量增加, 一方面可导致钢中珠光体增加, 另一方面提高了低碳钢在铁素体相区变形时的形变激活能; 前者促进、后者阻碍了铁素体动态再结晶. 总体上, Mn含量的增加对铁素体动态再结晶过程不利. 在铁素体动态再结晶能够进行完全的工艺条件下, 增加低碳钢中的Mn含量可以得到更加细小的铁素体动态再结晶晶粒.
The hot deformation behaviors and the microstructure evolution of three low carbon steels with similar C compositions and different Mn mass fractions (0.48%, 0.84% and 1.29%, respectively) are investigated by uniaxial hot compression at deformation temperatures of 700 ℃ and 600 ℃ and strain rates of 10 1 s -1 to 10 -3 s -1. The effect of Mn on dynamic recrystallization of ferrite is analyzed. The results indicate that dynamic recrystallization of ferrite occurs in these low carbon steels under certain deformation conditions, which range is wider as the content of Mn is lower. The effect of Mn on dynamic recrystallization of ferrite is that the increase of Mn content leads to the increases of pearlite amount and the deformation activity energy when deformed in the ferrite region, the former is beneficial to the dynamic recrystallization and the latter is just opposite. Because the latter is dominant, the increase of Mn content in low carbon steel is unfavorable for the progress of dynamic recrystallization of ferrite. At the deformation condition that the progress of dynamic recrystallization of ferrite can occur completely, the increase of Mn content results in a microstructure with finer ferrite grains.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] | |
| [10] | |
| [11] | |
| [12] | |
| [13] |
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