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一、前言奥氏体晶粒度是特殊钢中一个具有普遍性的问题。晶粒细化不仅可以提高母材的强度,而且能提高其塑性和韧性。影响奥氏体晶粒长大和粗化的因素较多,许多研究者提出了一些新的理论和概念。研究结果表明,奥氏体的成核,长大和粗化除受温度、时间的影响外,还取决于第二相质点的数量、分布状态和尺寸。我厂生产的50BA钢材均采用铝作为脱氧剂,在生产检验中发现有混晶现象,虽然成材后冶炼因素已基本固定,但根据我厂生
I. INTRODUCTION Austenitic grain size is a common problem in special steels. Grain refinement can not only improve the strength of the base metal, but also improve its plasticity and toughness. Many factors affect the austenite grain growth and coarsening, many researchers put forward some new theories and concepts. The results show that the nucleation, growth and coarsening of austenite depend on the quantity, distribution and size of the second phase particles, besides the influence of temperature and time. I produced 50BA steel are used as a deoxidizer, found in the production test mixed crystal phenomenon, although the finished smelting factors have been basically fixed, but according to our factory