摘要
利用Q345D连铸坯料,采用TMCP工艺进行了规格90 mm高强度厚板工业试验,研究了奥氏体未再结晶区总变形量对厚板组织性能的影响。结果表明,终轧温度800-750℃,终冷温度670-630℃时,调整奥氏体未再结晶区总变形量,钢板强度可达Q420E级,表面组织为沿奥氏体晶界析出的多边形先共析铁素体＋贝氏体,心部为铁素体＋珠光体。随着未再结晶区总变形量由25%增加到36%,钢板晶粒细化,z向性能提高,内部质量改善。目前,钢板批量试制产量已达4 200 t。
The industrial trials of 90 mm-gauge heavy plate steel were carried out through thermal mechanical control process （TMCP） with Q345D continuously cast slabs. The effect of total reduction in austenite non-recrystallization zone on microstructure and mechanical property was studied. The results indicate that using finishing rolling temperature 800-750 ℃, finishing cooling temperature 670-630℃, and adjusting the total reduction in austenite non-recrystallization zone, the strength of the heavy plate can reach the level of Q420E. The microstructure in surface layer consists of bainite and polygon proeutectoid ferrite which precipitated along the original austenite grain boundary, but in centre it consists of polygon ferrite and pearlite. As the total reduction in austenite non-recrystallization zone was increased from 25 % to 36 %, the grain was refined, z-direction property was enhanced and internal soundness was improved. Up to the present, 4 200 t heavy plates have been successfully produced by using 36 % total reduction in austenite non-recrystallization zone.
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2009年第10期12-16,共5页
Journal of Iron and Steel Research
基金
国家自然科学基金资助项目(50634030)
国家科技支撑计划资助项目(2006BAE03A08)
关键词
厚板
力学性能
工业试验
heavy plate
mechanical property
industrial trial
作者简介
李婧（1982-），女，博士生；E—mail：juny000001@126．com；
