作　　者： ; ; ; ;

机构地区： 东北大学材料与冶金学院轧制技术及连轧自动化国家重点实验室

出　　处： 《东北大学学报（自然科学版）》 2005年第8期743-746,共4页

摘　　要： 用Gleeble-1500热力模拟实验机研究了含铌微合金低碳钢在不同变形条件下连续冷却过程的相变规律,利用热膨胀法结合金相法建立了静态和动态的连续冷却转变曲线,分析了变形参数对组织的影响规律.研究表明,高温变形促进了珠光体相变,在950℃以上,变形温度的升高导致铁素体转变区减少;从贝氏体转变开始温度看,950℃变形促进了贝氏体相变;在相同变形温度下,随着变形量的增加,先共析铁素体的量增多,贝氏体量减少;在900℃以下变形促进了高温等轴铁素体的形成,抑制了贝氏体的相变. The transformation behavior of Nb-bearing microalloyed low carbon steel during continuous cooling with deformation at different temperatures was investigated by means of Gleeble-1500 thermomechanical simulator. The continuous cooling transformation（CCT） curves under deformed and undeformed conditions were obtained by way of thermal dilation and metallography. The influence of deformation parameters on microstructure was analyzed. The results showed that the transformation of pearlite is accelerated through high-temperature deformation, and transformation range of ferrite is reduced when deformed at the temperature above 950℃. In view of the starting transformation temperature, the hainite transformation is extended when deformed at 950℃. At the same deformation temperature, bainite amount decreases but proeutectoid ferrite amount increases with the increasing deformation amount. The formation of high-temperature equiaxed ferrite is accelerated and bainite transformation retarded when deformed at the temperature below 900 ℃.

关 键 词： 铌微合金低碳钢 连续冷却转变曲线 热膨胀法 贝氏体 先共析铁素体

领　　域： [金属学及工艺] [金属学及工艺]