V-Ti-N微合金化钢是适于再结晶控轧的新钢种。该系列钢具有高的奥氏体晶粒粗化温度,低的奥氏体再结晶温度以及热变形后小的晶粒粗化速度。同其它控轧钢一样,该钢也是靠细化晶粒来达到强韧化的。微合金化钢奥氏体实际晶粒的显示对研究控轧钢是十分重要的。本文介绍V-Ti-N微合金化钢奥氏体实际晶粒显示的一些经验。试验用料为25kg中频感应炉冶炼的,其典型成分见表1。首先分别将铸态和轧态试料加工成5×5×8mm规格的金相样品,然后将它们加热到各种不同温度保温1小时后,淬入10％NaOH水溶液中。此时基体组织全为板条马氏体。一般认为,当磷含量低时微合金钢原奥氏体晶粒难于显示。为此不得不采用长时间 V-Ti-N microalloyed steel is suitable for recrystallization controlled rolling of new steel. This series of steels has high austenite grain coarsening temperature, low austenite recrystallization temperature and small grain coarsening speed after hot deformation. Like other controlled rolled steels, the steels also rely on grain refinement to achieve toughening. The actual grain of austenite microalloyed steel is very important for the study of controlled rolling steel. This article describes the V-Ti-N microalloyed austenite actual grain shows some experience. Test materials for 25kg IF induction furnace smelting, the typical composition shown in Table 1. First, the as-cast and as-rolled specimens were each processed into 5 x 5 x 8 mm metallographic samples, which were then heated to various temperatures for one hour and quenched into 10% aqueous NaOH. At this point the matrix of all lath martensite. It is generally believed that austenite grains of microalloyed steels are difficult to show when phosphorus content is low. Have to use this for a long time