P510L钒微合金化钢连续冷却转变特征

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Study on Continuous Cooling Transformation of Vanadium Microalloyed Steel P510L

1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. Hot Rolled Strip Plant of PZH Steel, Panzhihua 617062, Sichuan, China

摘要: 采用膨胀法测定了攀枝花新钢钒热轧板厂的高强度P510L钒微合金化钢的CCT曲线,采用金相显微镜分析不同冷速下的显微组织。分析发现,冷却速度较慢（低于10℃/s）时,得到的显微组织为比较粗大的铁素体+珠光体组织;中速冷却时,组织为比较细小均匀的铁素体+珠光体组织;快冷时（高于35℃/s）主要为贝氏体和铁素体组织。进一步采用扫描电镜分析P510L显微组织,发现大量钒的析出物,V（CN）析出物的形态为从球形至长方形,其大小为10-30nm。
- 微合金钢 /
- 热轧 /
- 显微组织 /
- CCT曲线
Abstract: The CCT diagrams of vanadium microalloyed steel P510L were determined by dilatation method. The microstructures were analyzed by optical microscope. When the cooling rate was below 10℃/s, the mi-crostructures were coarse ferrite and pearlite, with the increase of cooling rate, the uniform fine ferrite and pearlite were found, while at the high cooling rate （above 35℃/s）, the bainite and ferrite were observed. According to SEM analysis, a lot of V precipitate were found. The V precipitate is 10-30nm in size with ball or cubic shape.
- microalloyed steel /
- hot rolling /
- microstiucture /
- CCT