合金成分和奥氏体变形对粒状贝氏体和粒状组织转变的影响

在Gleeble热模拟试验机上研究了低碳Mn-B系贝氏体钢的组织转变,分析了合金成分和奥氏体变形对粒状贝氏体及粒状组织转变的影响。结果表明,在相同冷却条件下,添加铬、铌元素后更利于粒状贝氏体组织的转变;在奥氏体未再结晶区,变形对粒状贝氏体及粒状组织的转变有明显的影响,随奥氏体变形温度的降低以及变形程度的增加,组织由粒状贝氏体向粒状组织变化。

Effects of chemical composition and austenite deformation on transformations of granular bainite and granular structure

The microstructure transformation of low carbon Mn-B bainitic steel was investigated on Gleeble simulator. The effects of chemical composition and austenite deformation on the transformations of granular bainite and granular structure were analyzed. The results show that under the same cooling condition, the addition of chromium and niobium is beneficial to the transformation of granular bainite. In nonrecrystallization range of austenite, the deformation has an obvious influence on the transformations of granular bainite and granular structure. The microstructure changes from granular bainite to granular structure with the decreasing of deformation temperature of austenite and increasing of deformation.