Q&P工艺对冷轧高强钢中残留奥氏体的影响  

Influence of quenching and partitioning process on retained austenite fraction of cold-rolled high strength steel

作　　者：赵征志[1] 梁驹华 汪烈承 唐荻[1] 许汉风 覃强 

机构地区：[1]北京科技大学冶金工程研究院,北京100083 [2]北京科技大学高等工程师学院,北京100083 [3]中钢设备有限公司,北京100080

出　　处：《材料热处理学报》2015年第7期81-87,共7页Transactions of Materials and Heat Treatment

基　　金：中央高校基本科研业务费专项资金(FRF-TP-10-001A)

摘　　要：对冷轧C-Si-Mn系高强钢进行了淬火与配分(Q&P)处理。利用扫描电镜、电子背散射衍射、X射线衍射等实验手段,研究了Q&P工艺参数与残留奥氏体量的关系。结果表明,残留奥氏体量在峰值淬火温度周围较大范围内变化不大,均在15%以上。配分温度的升高和配分时间的增加有助于残留奥氏体量的提高,过高的配分参数则会导致残留奥氏体的分解与碳化物的析出。实验钢于760℃淬火至160℃后经450℃配分60 s,残留奥氏体量可以达到22%,保证了较高的强塑积23 GPa·%,其中抗拉强度1518 MPa,伸长率15.2%。Quenching and partitioning treatment （Q＆P） was applied to a cold-rolled high strength C-Si-Mn steel. The relationship between the retained austenite fraction and the technological parameter of Q＆P process was investigated by means of scanning electron microscopy, electron backscattered diffraction and X-ray diffraction. The results show that the retained austenite fraction over 15% is obtained for the steel by quenching to the temperature of 120 ℃ to 180 ℃. The retained austenite amount increases with the increasing of partitioning temperature and time first, and then decreases due to the decomposition of retained austenite and precipitation of carbides. The retained austenite fraction of the experimental steel partitioning-treated at 450 ℃ for 60 s after quenching to 160 ℃ from 760 ℃ is up to be more than 22% , with the product of strength and elongation over 23 GPa. % , tensile strength of 1518 MPa and elongation of 15.2%.

关 键 词：Q&P工艺 高强度钢 残留奥氏体 力学性能 

分 类 号：TG142.2[一般工业技术—材料科学与工程]