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采用Gleeble-3500热模拟试验机和背散射电子衍射(EBSD)技术分析研究了Cu-P-Cr-Ni-Mo耐候钢在(γ+α)两相区不同变形量和不同变形温度下的组织演变,探究了铁素体晶粒的细化机理。结果表明,Cu-P-Cr-Ni-Mo耐候钢在750℃,应变速率为0.01 s-1变形时,当应变超过0.69后,铁素体的转变量增加不明显,但等轴铁素体晶粒数量增加,新形成的细小等轴再结晶铁素体晶粒尺寸达到1.4~3μm;在850~750℃、应变速率为0.01 s-1变形时,随着变形温度的降低,铁素体转变量增加,铁素体晶粒尺寸减小,但均匀性降低。Cu-P-Cr-Ni-Mo耐候钢(γ+α)两相区铁素体晶粒细化机制为铁素体的连续动态再结晶,并且随着变形温度的降低,发生铁素体的连续动态再结晶的能力增强。
The microstructures of Cu-P-Cr-Ni-Mo weathering steels at different deformations and deformation temperatures in (γ + α) two-phase region were studied by Gleeble-3500 thermal simulation tester and backscattered electron diffraction (EBSD) Evolution, to explore the refinement mechanism of ferrite grains. The results show that the amount of ferrite transformation does not increase obviously when the strain exceeds 0.69 at 750 ℃ and the strain rate is 0.01 s-1. However, the equiaxed ferrite The grain size of the newly formed fine equiaxed recrystallized ferrite reaches 1.4 ~ 3μm. When the deformation rate is 0.01 s-1 at 850-750 ℃, the grain size of ferrite The amount of transformation increases, the ferrite grain size decreases, but the uniformity decreases. The grain refinement mechanism of ferrite in the two-phase region of Cu-P-Cr-Ni-Mo weathering steel is a continuous dynamic recrystallization of ferrite, and as the deformation temperature decreases, ferrite Continuous dynamic recrystallization enhanced ability.