3Cr2Mo钢CCT曲线的测定与分析.pdfVIP

中南大学学报(自然科学版) Vol.42 No.7 第42 卷第7 期 2011 年7 月 Joumal of Central South Univenlty (Sdence and Technology) July 2011 3Cr2Mo 钢 CCT 曲线的测定与分析 李红英，王法云，曾翠婷，李阳华，曹俊 (中南大学材料科学与工程学院，湖南长沙， 410083) 摘要2 在 Gleeble-1500 热模拟机上测定 3Cr2Mo 铜以不同冷却速度连续冷却时的膨胀曲线，结合金相-硬度法、 示差热分析法(DSC)获得该钢的连续冷却转变曲线(CCT 幽线).根据测得的 CCT 曲线，分析以不同冷却速度连续 冷却时的组织转变:阐明冷却速度与组织的演变以及硬度变化的关系.比较分析所测 CCT 曲线与同类转变曲线 的异同.研究结果表明z 马氏体转变的临界冷却速度为 LO-1.5 C/S; 为生产实践和新工艺的制定提供了参考依据。 关键词: 3Cr2Mo 钢; CCT 曲线:热模拟; DSC 中图分类号: TGl5 1.2; TG15 1.3 文献标志码:A 文章编号: 1672-7207(2011)O7-1928-l6 Determination and analysis of CCT curves of 3Cr2Mo steel LI Hong-yÎDg, WANG Fa-严皿， ZENG Cui-ting, LI Yang-hua, CAO Jun (School ofMaterials Science and Engineering, Central South UniveJS坷， Changsha 41ω83， China) Abstract: The di他rent dilatometric curves of continuous cooling transformation were determined by Gleeble-15∞ thermal mechanical simulation. By dilatome国c change and DSC analysis referencing microscopic test and hardness measurement, the continuous cooling transformation (CCT) diagram was obtained. According to 也e CCT diagram obtained above, the transformation of austenite at different c∞ling rates were analyzed, and the relationship between the cooling rates and 也e variation of microstructure and hardness was disc1osed. At last the similar transition curve was investigated. The results show that martensite transition critical cooling velocity is 1.0-1.5 C/s. AII those provide the references for productive practice and establishing new technic. Key words: 3Cr2Mo steel; CCT curve; thermal mechanical simulation; DSC 考其相变动力学曲线。但由于CCT 曲线的测定比较困 钢的连续冷却