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长期以来,国内外都在研究控制钢中奥氏体晶粒度的各种方法。但是,对于控制晶粒度的过程并不十分了解。这个问题涉及到奥氏体晶粒长大的机制,它不仅是一个重要的理论问题,而且对生产实际有直接的指导意义。本文采用高温金相技术及连续定位拍照的方法,研究合金结构钢奥氏体晶粒长大过程中晶界的行为,初步探讨奥氏体晶粒长大机制。通过大量观察研究表明,奥氏体晶粒异常长大与正常长大一样,其实质均为晶界迁移,从而进一步为第二相(如AlN)质点的钉扎理论提供依据。
For a long time, various methods of controlling austenite grain size in steel have been studied both at home and abroad. However, the process of controlling grain size is not well understood. This problem relates to the mechanism of austenite grain growth, it is not only an important theoretical issue, but also has a direct guiding significance for the actual production. In this paper, high-temperature metallographic techniques and continuous positioning photographs were used to study the behavior of grain boundaries in the austenite grain growth process of alloy structural steel. The mechanism of austenite grain growth was discussed. A large number of observations show that the abnormal growth of austenite grains as normal growth, the essence of grain boundary migration, which further for the second phase (such as AlN) pinning theory provides the basis.