V-N微合金化600MPa高强度钢筋钢的动态连续冷却转变曲线  

Dynamic continuous cooling transformation curves of V-N microalloying 600 MPa high strength rebars steel

作　　者：王庆新[1,2] 王福明[1,2] 张婧[1,2] 赵谦[1,2] 黄传根[1,2] 

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室,北京100083 [2]北京科技大学冶金与生态工程学院,北京100083

出　　处：《金属热处理》2015年第6期34-37,共4页Heat Treatment of Metals

基　　金：国家自然科学基金(51174020;51374018);国家高技术研究发展计划(863计划)(2013AA031601);中央高校基本科研业务费专项资金(FRF-SD-12-010A)

摘　　要：利用Gleeble-1500热模拟试验机测定了V-N微合金化600 MPa高强度钢筋钢在不同冷速下连续冷却转变的热膨胀曲线,结合显微组织观察,获得了该钢的动态连续冷却转变曲线。结果表明,当冷却速率小于1℃/s时,组织为铁素体和珠光体;当冷却速率为3℃/s时,出现少量贝氏体;当冷却速率为8℃/s时,珠光体消失,组织为铁素体和贝氏体;当冷却速率为10℃/s时,开始出现马氏体;当冷却速率在20℃/s以上时,组织全部转变为马氏体。Thermal dilatometric curves of V-N microalloying 600 MPa high strength rebars steel were determined by Gleeble-1500 thermal simulator, combined with observation of microstructure, the dynamic continuous cooling transformation curves of the steel were obtained. The results show that when the cooling rate below 1 ℃/s, the microstructure is ferrite and pearlite, as the cooling rate is 3 ℃/s, a little bainite appears, as the cooling rate is 8 ℃/s, pearlite disappear and microstructure is ferrite and bainite, at the cooling rate 10 ℃/s, martensite begins to appear, when the cooling rate is up to 20 ℃/s, the microstructure is complete martensite.

关 键 词：V-N微合金化 600 MPa高强度钢筋钢 动态连续冷却转变曲线 显微组织 

分 类 号：TG142.1[一般工业技术—材料科学与工程]