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研究了用高温再结晶控制轧制及控制冷却工艺生产低碳V-Ti-N微合佥钢的可行性及钢的化学成分配比对综合性能的影响。结果表明: 含有0.05％C和100ppmN的V-T/-N钢,经RCR+CC工艺处理后,具有满意的综合机械性能,屈服强度达411MPa,延伸率为34％,-40℃V型缺口试样冲击能为62J/cm_2,梅氏试样冲击能为117J/cm_2。 钢中碳含量过低,使铁素体晶粒粗大,强度尤其是低温冲击韧性明显下降。 晶粒界和细小的析出粒子,通过交互作用对屈服强度产生贡献。 分析表明,轧后冷却方式对获得细小弥散析出的V (C、N) 是很重要的。
The feasibility of producing low-carbon V-Ti-N micro-alloyed steel by high temperature recrystallization controlled rolling and controlled cooling process and the effect of chemical composition of steel on the overall performance were studied. The results show that the VT / -N steel containing 0.05% C and 100ppmN, after RCR + CC process, has satisfactory mechanical properties with a yield strength of 411MPa and an elongation of 34%. V-notch specimens at -40 ℃ Impact energy of 62J / cm_2, Mechs sample impact energy of 117J / cm_2. Low carbon steel, ferrite grains coarse, strength, especially low temperature impact toughness decreased significantly. The grain boundaries and fine precipitated particles contribute to the yield strength through the interaction. The analysis shows that the cooling mode after rolling is very important for obtaining V (C, N) with small and dispersed precipitation.