双细化热处理工艺对细化原奥氏体晶粒尺寸有显著作用，双细化热处理后的细晶粒占比大幅度增加，晶界数目增多，而位错运动又常停止与晶界处，所以可能会使位错密度增大。

The double refining heat treatment process has a significant effect on refining the original austenite grain size. After the double refining heat treatment, the proportion of fine grains increases significantly, the number of grain boundaries increases, and the dislocation movement often stops at the grain boundaries, so the dislocation density may increase.