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本文用光学显微镜,扫描电镜及透射电镜观察到在Fe-0.37C-1.96Si和Fe-0.29C-9.75Ni合金中的块状铁素体。块状铁素体形成在B_s点以上相当宽的温度范围,其亚结构含有位错圈或位错偶,或有位错网的亚单元。根据亚结构的特征,提出了一个位错攀移—滑移动力学模型。对于纯铁,攀移速度V_c与滑移速度V_g在700℃附近具有相同数值(约为5×10~3/秒数量级),会出现块状铁素体。
In this paper, the bulk ferrite in Fe-0.37C-1.96Si and Fe-0.29C-9.75Ni alloys was observed by light microscopy, scanning electron microscopy and transmission electron microscopy. Bulk ferrite is formed over a fairly wide temperature range above the B_s point, with substructures containing dislocation loops or dislocation pairs, or subunits with dislocation meshes. According to the characteristics of substructures, a dislocation climbing - sliding dynamics model is proposed. For pure iron, the climbing velocity V_c and slip velocity V_g have the same value (about 5 × 10 ~ 3 / s) around 700 ℃, and the massive ferrite will appear.