【摘要】 在高温金相显微镜下,直接观察碳化物在热轧硅钢中的分解与析出过程。指出冷却速度对碳化物析出形态有很大影响。用差热分析确定了碳化物的分解与析出温度。所得结果为改进热轧硅钢生产工艺提供了重要的依据。更多还原

【Abstract】 The decomposition and precipitation of carbides in the hot-rolled Si-Fe sheets were studied by means of both high temperature metallography and differential thermal analysis. It has been found that the decomposition during heating and the precipitation during cooling start from 720 and 750℃ respectively. The shape and distribution of the precipitated carbides are markedly influenced by the cooling rate of the sheets after hot-rolling. If the cooling rate is high enough, saying up to 100℃/min, the carbides would be precipitated dispersely; while it slows down to about 1℃/min, they would be aggregated coarsely. The shape and distribution of the precipitated carbides are dependent on the efficiency of decarburization. In other words, the more disperse the carbide is, the more effective the decarburization will be. The results may provide leads for further improvement on the technology for hot-rolling Si-Fe sheet production.更多还原