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本文研究了奥氏体化温度(轧前的原始奥氏体晶粒大小)、轧制温度、压下率及轧后快冷前的停留时间对热变形奥氏体的再结晶及再结晶奥氏体晶粒大小的影响,确定了轧前奥氏体晶粒尺寸、轧制温度及轧后快冷前的停留时间与奥氏体再结晶临界变形量之间的关系,以及原始奥氏体晶粒大小、轧制温度及压下率与再结晶后奥氏体晶大小之间的关系。也研究了在950°、900°及850℃轧制时的压下率与转变后的铁素体形态之间的关系,再结晶奥氏体晶粒大小与转变后的等轴铁素体晶粒大小的关系。在以上研究的基础上,研究了4C船板在多道轧制后的低温冲击韧性、屈服强度等与控制轧制工艺所决定的轧后铁素体品粒大小之间的定量关系。根据以上研究的结果,初步得出有关低碳钢(4C)控制轧制的两点结论。
In this paper, the effects of austenitizing temperature (the original austenite grain size before rolling), rolling temperature, reduction ratio and residence time before rapid cooling on the recrystallization and recrystallization of hot deformed austenite The relationship between the austenite grain size, the austenite grain size before rolling, the rolling temperature and the residence time before rapid cooling and the critical deformation of austenite recrystallization, as well as the relationship between the original austenite Relationship between grain size, rolling temperature and reduction ratio and austenite grain size after recrystallization. The relationship between the reduction ratio at rolling at 950 °, 900 ° and 850 ° C and the transformed ferrite morphology was also studied. The recrystallized austenite grain size and the transformed equiaxed ferrite crystal The relationship between grain size. Based on the above studies, the quantitative relationship between the low temperature impact toughness, yield strength and the size of ferrite grains after rolling controlled by 4C is studied. Based on the above results, two conclusions about controlled rolling of mild steel (4C) are obtained.