【摘要】 在Gleeble1500上对高强船板钢F40的热轧工艺进行了模拟研究,对晶粒细化机理进行了详细的分析。结果表明,对奥氏体进行两阶段的大压下量轧制,为随后的相变提供更多的形核点和大的形核驱动力,大形变能诱导碳氮化物析出,阻止再结晶后的晶粒长大,但会使相变时间提前,相变温度提高;适当增加冷速能使针状铁素体明显细化,从而获得以针状铁素体为主要组织的多相结构。更多还原

【Abstract】 The hot rolling technology of high strength ship plate steel F40 was simulated on Gleeble 1500,the mechanism of the grains refinement was minutely analyzed.The experimental results indicate that the nucleation sites and the nucleation driving force are greatly increased with the increase of deformation in recrystallization and non-recrystallization region.Meanwhile,large deformation can promote the precipitation of carbonitride and make the grains after austenite recrystallization grow slowly;but the phase transition time is eariler,the phase transition temperature increases;increasing colling rate properly can make the grains refineing and obtain the heterogeneous structure with more acicular ferrite in ship plate steel F40.更多还原