经过DRT不同淬火冷速处理的实验钢，大尺寸碳化物数量有了一定程度减少。但针对双淬火工艺，不同淬火冷速下共晶碳化物的尺寸并没有明显区别。随着淬火冷却速度的升高，残余奥氏体含量逐渐降低，快速冷却条件下残余奥氏体含量降低到16%。随着淬火速度的增加，马氏体宽度逐渐降低，从228nm降低到197nm，而马氏体宽度的降低对实验钢的强度及冲击韧性带来提升。随着淬火速度的增加，孪晶的长度和数量有明显增加趋势，同时伴随孪晶间距的减小，孪晶是奥氏体在较低温度下转变为马氏体时的切变过程中，通过以孪生的方式变形而形成的。

The amount of large-sized carbides in the experimental steel treated with different quenching and cooling rates of DRT has been reduced to a certain extent. However, for the double quenching process, there is no obvious difference in the size of eutectic carbide under different quenching cooling rates. With the increase of quenching cooling rate, the content of retained austenite decreases gradually, and under the condition of rapid cooling, the content of retained austenite decreases to 16%. With the increase of quenching speed, the width of martensite decreases gradually, from 228 nm to 197 nm, and the reduction of martensite width improves the strength and impact toughness of the experimental steel. With the increase of quenching speed, the length and number of twins have a significant increase trend. At the same time, with the decrease of twin spacing, twins are formed by twinning deformation during the shear process when austenite transforms into martensite at a lower temperature.