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利用SEM和TEM对5CrMnMo钢超塑性变形后的试样进行了观察与分析,结果表明:5CrMnMo钢在超塑性变形过程中,晶界附近位错运动很活跃。位错与第二相粒子相互作用形成位错缠结。在较高应变速率下拉伸,晶界附近有位错亚结构形成;在较低应变速率下拉伸,晶界上有明显的条纹区产生。采用10~(-4)～10~(-3).S~(-1)范围内的应变速率,在最佳超塑温度下拉伸,发现晶粒尺寸明显减小。同时也观察、分析了空洞的形成、连接之规律,空洞的形成、长大、连接导致材料的最终断裂。
The superplastic deformation of 5CrMnMo steel was observed and analyzed by SEM and TEM. The results show that the dislocation movement of 5CrMnMo steel is very active during the superplastic deformation. Dislocations interact with second-phase particles to form dislocations. At higher strain rates, there is a dislocation sub-structure near the grain boundaries. At lower strain rates, there are obvious stripes on the grain boundaries. With the strain rate in the range of 10 ~ (-4) ~ 10 ~ (-3) .S ~ (-1), the grain size is obviously reduced at the optimum superplastic temperature. At the same time also observed and analyzed the formation of voids, the connection of the law, the formation of voids, grow up, the connection led to the final fracture of the material.