低碳低合金钢中晶内铁素体与组织控制.pdf

低碳低合金钢中的晶内铁素体与组织控制 吴开明 （武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,应用物理系， 武汉 430081 ） 摘 要 对晶内铁素体的发现、发展及其与组织控制的关系进行了简要的回顾与 评述。重点讨论了晶内铁素体的形核机制和影响因素。简要地介绍了晶内铁素体 的三维形态和长大动力学。最后，从晶内铁素体的形核、长大、形态和分布等方 面分析了晶内铁素体对低碳微合金钢组织细化的重要作用和影响。 关键词 钢，低合金钢，显微组织，晶内铁素体，贝氏体，三维形态，长大动力 学，组织控制 中图法分类号 TG111, TG142 INTRAGRANULAR FERRITE AND MICROSTRUCTURE CONTROL IN LOW CARBON MICROALLOYED STEELS WU Kaiming (K.M. Wu) Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Department of Applied Physics, Wuhan University of Science and Technology, Wuhan 430081. Correspondent: Wu Kaiming, professor, Tel: (027 Fax: (027 E-mail: wukaiming@wust.edu.cn Supported by National Natural Science Foundation of China (No Manuscript received 2006-02-xx ABSTRACT The discovery and current advances of intragranular ferrite and its relation with microstructure control are reviewed. The nucleation mechanisms and influencing factors on the formation of intragranular ferrite are discussed. Three-dimensional morphology and growth kinetics of intragranular ferrite are briefly introduced. Finally, the important role and effect of intragranular ferrite were analyzed on the microstructure refinement for low carbon microalloyed steels from the view point of nucleation, growth, morphology and distribution. KEY WORDS steel, low alloyed steel, microstructures, intragranular ferrite, bainite, three-dimensional morphology, growth kinetics, microstructure control ∗国家自然科学基金资助项 收到初稿日期：2006-02-xx，收到修改稿日期： 作者简介：吴开明，男，1966 年生，教授，博士 细化晶粒是既能提高钢强度，又能提高钢韧性的方法。传统的细化晶粒方法 是通过加工来细化原始奥氏体晶粒，然后在原始奥氏体晶界和晶粒内形成铁素体 和/或者贝氏体。近年来，通过在钢中分布（人为加入和/或者冷却过程中产生的） 微细夹杂物和/或者析出物作为非均匀形核地点来形成晶内铁