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采用热模拟实验研究了奥氏体再结晶区变形温度对微合金钢晶粒细化和宏观硬度的影响。结果表明:奥氏体再结晶区变形温度显著影响钢材的显微组织。变形温度由1100℃降至1000℃,原奥氏体晶粒尺寸由60.0μm大幅度细化至34.1μm,细化了43.2%。最终获得了铁素体+珠光体组织,铁素体晶粒尺寸也实现了显著的细化,由15.5μm细化至8.8μm,细化程度达43.2%。但奥氏体再结晶区变形温度对宏观硬度的影响不大。因此,为了提高钢材,尤其是厚板的强韧性,再结晶区变形温度应适当降低。
The effect of deformation temperature of austenite recrystallization zone on grain refinement and macroscopic hardness of microalloyed steel was studied by means of thermal simulation. The results show that the deformation temperature of austenite recrystallization zone significantly affects the microstructure of steel. Deformation temperature from 1100 ℃ to 1000 ℃, the original austenite grain size from 60.0μm greatly refined to 34.1μm, refined 43.2%. Finally, the ferrite + pearlite structure was obtained, and the grain size of the ferrite was also remarkably refined, ranging from 15.5μm to 8.8μm with a refining degree of 43.2%. However, the deformation temperature of austenite recrystallization zone has little effect on the macroscopic hardness. Therefore, in order to improve the toughness of steel, especially thick slab, recrystallization zone deformation temperature should be appropriately reduced.