摘要
在实验室条件下采用50kg真空感应炉冶炼和两段控制轧制工艺,采用THERMECMASTOR Z热模拟机对过冷奥氏体连续冷却转变曲-tAr1)温度区间增大;并使钢的CCT曲线右移,并且使(tAr3线进行了测定,试验结果表明,低硫铌钛钢中稀土铈能提高钢的临界点tAr3和tAr1和上移,降低了钢的淬透性;铈会使贝氏体转变点升高,同时加大了贝氏体转变间隔;当冷却速度较高时,稀土使马氏体由粗条状变为细条状,降低了Ms点,并且增强了马氏体结构的板条化趋势,抑制了片状晶生成。
The overcooling austenite CCT curves were investigated by using THERMECMASTOR-Z simulation machine, the test samples refining from 50 kg vacuum induction furnace and two-stage controlled rolling in laboratorial condition. Test results show that addition cerium (Ce) in low sulfur Nb-Ti-bearing steel affects as follows: Ce can increase the transformation point t_(Ar_3) and t_(Ar_1), enlarge the intervals of temperature (t_(Ar_1)-t_(Ar_3)). Ce can make the CCT curves to move upper and right, reduce the hardenability. Ce can increase the transformation temperature of bainite and enlarge intervals of bainite. The martensites become from coarse strip to fine strip by Ce in higher cooling rates. Ce can decrease M_s and enhance the trend of lath martensitic structure and limit the formation of lamellar crystal.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2004年第5期665-669,共5页
Journal of the Chinese Society of Rare Earths
基金
国家"十五"攻关项目
关键词
铌钛钢
组织
相变
稀土
Nb-Ti-bearing steel
structure
phase transformation
rare earths
