3％Si-Fe中适量碳的存在,对细化热轧板晶粒,稳定初次再结晶基体都起到有利的作用.一旦初次再结晶完成后,碳作为“有利元素”的历史作用即告结束,它的继续存在不仅阻碍二次再结晶的顺利进行,更严重恶化成品磁性,特别是使磁时效极为显著.所以,二次再结晶以前的脱碳对于成品的质量至为重要. 本实验对脱碳过程进行了较详细的研究,导出了给定条件下脱碳速率的经验公式.根据此公式可由给定的脱碳时间,预测碳含量,反之亦然.同时,对脱碳过程中晶粒的正常长大也进行了研究,并给出了描述晶粒长大速率的公式.基于上述研究,讨论了二次再结晶前的碳含量、脱碳时间(晶粒尺寸)与材料最终磁性的相关性.磁性与碳含量、脱碳时间的函数关系用平面图形显示.利用此图形可直观、便捷地选择获得最佳性能的脱碳工艺.
The effect of decarburizing process on the magnetic properties of the grainoriented 3%Si-Fe has been studied. An empirical expression for the rate of decar-burization under given conditions was proposed. While the time of decarburizationwas given, the carbon content in 3%Si-Fe might be predicted, and vice versa.Another empirical expression for the rate of grain growth was also derived fromobservation of normal grain growth during decarburization. Based upon the aforementioned expressions, the functional dependence of thecarbon content before secondary recrystallization and time required for decarburi-zation on final magnetic properties of the grain oriented 3%Si-Fe has been dis-cussed. A two-demensional plot was then drawn on which the decarburizing pro-cess would be easily determined to acquire materials of superior quality.
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