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本文通过研究控制轧制对钢的组织和性能的影响,确定了控制轧制技术对20g钢板的适宜性。研究轧制道次及压下率对变形奥氏体的再结晶和晶粒大小的影响结果表明:热轧奥氏体晶粒是逐道细化的,但前两道轧制细化作用最大,随后道次细化作用逐渐减弱;在以20％的道次压下率轧制时,除第一、四道外,变形奥氏体都发生充分的再结晶,而在以10％的道次压下率轧制时,在所有道次中都只发生部分再结晶,20％的道次压下率要比10％为好。轧制道次及压下率对20g钢板轧后铁素体晶粒尺寸的影响规律表明:奥氏体再结晶区轧制的道次压下率及终轧温度是决定轧后铁素体晶粒大小的主要工艺参数。根据本实验结果拟定了适宜的轧制工艺参数。
In this paper, by studying the effect of controlled rolling on the microstructure and properties of steel, the suitability of controlled rolling technique for 20g steel was determined. The effect of rolling pass and reduction rate on the recrystallization and grain size of deformed austenite was studied. The results show that hot-rolled austenite grains are refined on a track-by-pass basis, but the refining effect of the first two passes is the largest , Followed by refinement gradually weakened; at 20% pass reduction rolling rate, in addition to the first and fourth, the deformation of austenite are fully recrystallized, and in the order of 10% When rolling at rolling reduction, only partial recrystallization occurred in all passes, and 20% pass reduction was better than 10%. The influence of rolling pass and reduction rate on ferrite grain size after 20g steel rolling showed that the pass reduction rate and finishing temperature of austenite recrystallization zone are the factors that determine the rolling ferrite The size of the main process parameters. Based on the results of this experiment, the suitable rolling parameters were worked out.