钒微合金化低碳贝氏体钢的连续冷却相变特性  

Phase Transformation Characteristics of Vanadium Microalloying Low Carbon Bainitic Steel in Continuous Cooling Process

作　　者：高飞[1,2] 钱天才[1] 王瑞珍[2] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]钢铁研究总院结构材料研究所,北京100081

出　　处：《钢铁研究学报》2011年第12期40-44,共5页Journal of Iron and Steel Research

摘　　要：采用热膨胀法测定6种不同成分低碳贝氏体钢的连续冷却转变(CCT)曲线。CCT曲线表明,加入微量硼能使含钒低碳贝氏体钢在大于0.3℃/s的冷速下获得贝氏体组织,而V-N微合金化的低碳贝氏体获得全贝氏体的临界冷速要高于V-B钢,且贝氏体转变的开始温度也要较V-B钢高20℃左右。在含钒、氮低碳贝氏体钢中加入钼、铬将会促进钢的贝氏体相变,但钼的作用要优于铬;钼、铬的加入可使含钒、氮低碳贝氏体钢的贝氏体转变温度降低至少30℃,且贝氏体组织得到了细化,钢的维氏硬度也提高了HV 10～30。The continuous cooling transformation（CCT） curves of experimental steels were tested with heat dilatometer.The results show that the low carbon steel containing V and B can obtain fully bainitic microstructures more than 0.3℃/s of cooling rate.Compared to V-B steel,low carbon steels microalloying with V-N have higher critical cooling rate to achieve fully bainite,also bainite start temperature is about 20℃ higher than V-B steel.The element of Mo and Cr additions to V-N microalloyed low carbon steels can promote bainite transformation and Mo is more effective than Cr.Adding Mo and Cr into V-N microalloyed low carbon bainitic steels can lower bainite transformation temperature at least 30℃ and refine bainitic microstructures,thus increase the Vickers hardenss HV10-30.

关 键 词：CCT曲线 低碳贝氏体钢 钒 V-N微合金化 

分 类 号：TG142.1[一般工业技术—材料科学与工程]