【作者】 田允； 赵征志； 吴新朗； 陈雨来； 刘光明； 代晓莉； 熊爱明；

【Author】 Tian Yun~1 Zhao Zhengzhi~1 Wu Xinlang~1 Chen Yulai~1 Liu Guangming~2 Dai Xiaoli~2 Xiong Aiming~2 (1.Research Institute of Metallurgy Engineering,University of Science and Technology Beijing,Beijing 100083;2.Shougang Research Institute of Technology,Shougang Group Corporation,Beijing,100041)

【机构】 北京科技大学冶金工程研究院； 首钢技术研究院；

【摘要】 利用热模拟实验机,建立了低碳微合金钢未变形和变形奥氏体的 CCT 曲线。利用光学显微镜分析研究了奥氏体变形、冷却速度对连续冷却相变及显微组织的影响。结果表明,变形促进了奥氏体向铁素体转变, 扩大了珠光体区域,有利于珠光体转变,使获得贝氏体组织的临界冷速增大；同时在较高的冷速下,变形有利于细化晶粒,改善组织形态。随冷却速度提高,试验钢相变温度降低,组织细化,铁素体的形貌从多边形逐渐向针状转变。更多还原

【Abstract】 The continuous cooling transformation(CCT)diagrams of austenite non-deformatioh and deformed were constructed on the thermomechanical simulator for a low carbon microalloyed steel .Optical microscope was employed to investigate the influence of deformation process and cooling rate on the transformation behavior and microstructure.The experimental results show that the deformation promotes the transformation from austenite to ferrite,enlarges the area of phase pearlite,and promotes the pearlite transformation,leading to the increase of critical cooling rate obtained bainite. Under the high cooling rate,the deformation can free grain and improve micrograph.While the cooling rate increases, transformation temperature decreases,the microstructure refines and the ferrite shape changes fi’om polygon to acetate features.更多还原