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本文就有关含硅钢贝菌体的形态特征与碳化物沉淀机制,用透射电镜技术对35CrMnSi钢在220℃至420℃等温区间,不用的等温时间发生的贝菌体相变做了详细地观察,主要得出下面的一些结果。(1)贝菌体形态在350℃存在一条明显的转变分界线,这类似于已报导的在350℃出现的上下贝分界线。在350℃以下单个贝菌铁素体条(片)的边界清晰,其形态有两种,一种贝菌铁素体板条平行束状排列,一种是片状,出现于290℃以下。碳化物与奥氏体组成的条议分布于边界或伸入内部分割成亚板条结构。350℃以上出现的上贝菌体,其板条边界消失,平行排列的粗大的碳化物—奥氏体条纹基本上是平行于贝菌体的长轴,其双轨式,分叉式等差别仅是受扩散控制而引起的形貌上的差异而已。
In this paper, the morphological characteristics and carbide precipitation mechanism of silicon-bearing steel fungi were investigated in detail. Transmission electron microscopy was used to observe the phase transition of 35CrMnSi steel in the isothermal period of 220 ℃ to 420 ℃, The main result of some of the following. (1) There is a clear transitional boundary at 350 ℃ for the mycelial morphology, which is similar to the reported upper and lower shell boundary at 350 ℃. At 350 ° C, the boundaries of a single fungal ferrite strip are clear and have two morphologies, one in which the fungus ferrite laths are arranged in parallel bundles and one in the form of pellets, appearing below 290 ° C. Carbide and austenite bar or the distribution of the boundaries into the internal division into sub-plate structure. Above 350 ° C, the lamellar boundary disappears. The coarse carbide-austenite fringes arranged in parallel are basically parallel to the long axis of the bacteroidetes. It is the difference in topography caused by proliferation control.