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： 《钢铁钒钛》 2006年第1期6-11,共6页

摘　　要： 采用Gleeble-1500热模拟实验机,结合显微硬度测试,建立了含V、Ti微合金钢的未变形和50%形变奥氏体的CCT曲线。利用光学显微镜、透射电镜分析研究了冷却速度、变形条件及微合金元素对显微组织的影响。结果表明,变形使铁素体+珠光体相变区左移,获得铁素体+珠光体组织的临界冷速增大。变形也使贝氏体相变温度有所提高,同时在较高的冷速下,变形可使显微组织变得更加细小。V、Ti的复合添加,提高了过冷奥氏体的稳定性,使相变温度降低,有利于得到细小的组织。 The continuous cooling transformation （CCT） diagrams of austenite non - deformation and 50% compressively deformed at 950 ℃ were constructed on the Gleeble - 1500 thermomechanical simulator and by means of a combined method of microhardness measurement for a microalloyed steel include V and Ti. Optical microscope and TEM were employed to investigate the influence of cooling rate, deformation process and microalloying elements on the transformation behavior and microstructure. The experimental results show that the deformation promotes the area of ferrite and pearlite move towards left, leading to the increase of critical cooling rate obtained ferrite plus pearlite. The deformation increases the transformation temperature of bainite and makes microstructure finer under high cooling rate. The stability of austenite is enhanced by the co- addition of V and Ti, which decreases transformation temperature and results the refinement of microstructure.

关 键 词： 微合金钢 曲线 显微组织

领　　域： [金属学及工艺] [金属学及工艺]