Q345B钢的凝固与相变行为  

Solidification and Phase Transformation Behavior of Q345B Steel

作　　者：赵国际[1] ZHAO Guoji(Chongqing Industry Polytechnic College,Chongqing 401120,China)

机构地区：[1]重庆工业职业技术学院机械工程学院,重庆401120

出　　处：《铸造技术》2018年第12期2671-2672,2677,共3页Foundry Technology

基　　金：重庆市教委科研基金资助项目(KJ132105)

摘　　要：利用激光共聚焦扫描显微镜(CLSM)模拟了钢凝固过程的热历程,对Q345B钢凝固过程中的奥氏体晶粒长大与相变行为进行了原位观察研究。结果表明:冷却速度和第二相析出是影响原始奥氏体长大的主要因素;冷却速度为2～4℃/s时,原始奥氏体晶粒尺寸随冷却速度变化而变化最为显著,冷却速度超过4℃/s时则影响明显减弱。The process of initial solidification and thermal cycle of Q345B steel was simulated by confocal scanning laser microscope (CSLM). The behavior of austenite grain growth and phase transition of solidification process was investigated in situ observation. The results show that the cooling rate and precipitation of the second phase is the main factors influencing the original austenite grain growth; When the cooling rate is 2-4 ℃/s, the original austenite grain size changes over cooling speed is most significantly, the cooling speed is more than 4 ℃/s influence decreased significantly.

关 键 词：Q345B钢 凝固 相变 奥氏体 

分 类 号：TG269[金属学及工艺—铸造]