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在 Gleeble- 15 0 0热 /力模拟机上测试了用 CSP技术生产的低碳钢薄板连铸坯变形后的连续冷却转变曲线 ,并分析了组织演变规律。低碳钢薄板连铸坯的连续冷却相变转变温度较低 ,且随冷速的提高而降低 ,其 γ+α两相区的温度范围较宽 ,都在 15 0℃以上。相变后的最终组织为大量铁素体加部分珠光体。冷速较低时 ,铁素体晶粒呈多边形 ;冷速高时 ,晶粒多呈尖角形。随着冷速的提高 ,铁素体晶粒尺寸减小。在本实验变形条件下 ,当冷速达到 15℃ / s时 ,细化的铁素体晶粒尺寸趋于一个极限值 ,约为 8μm
The continuous cooling transformation curve of low carbon steel slab produced by CSP technology was tested on a Gleeble-15 0 0 heat / force simulator, and the microstructure evolution was analyzed. The continuous cooling transformation temperature of low carbon steel slab is lower, and decreases with the increase of cooling rate. The temperature range of γ + α two-phase zone is wide, all above 15 0 ℃. The final phase after the transformation of a large number of ferrite plus some pearlite. When the cooling rate is low, the ferrite grains are polygons; when the cooling rate is high, the grains are mostly sharp-pointed. As the cooling rate increases, the ferrite grain size decreases. Under the experimental deformation conditions, when the cooling rate reaches 15 ℃ / s, the refined ferrite grain size tends to a limit value of about 8μm