超高强度船体结构用钢板F690连续冷却转变行为  

Continuous cooling transformation behavior of ultra-high strength hull steel F690

作　　者：李曲全[1,2] 曹志强[1,2] 李玲玲[1] 武会宾[2] 杨小军[1] 肖大恒[1] 孙小平[1] 

机构地区：[1]华菱湘潭钢铁集团有限公司科技开发中心,湖南湘潭411101 [2]北京科技大学冶金工程研究院,北京100083

出　　处：《金属热处理》2010年第11期26-29,共4页Heat Treatment of Metals

摘　　要：在MMS-200热力模拟机上,利用膨胀法结合金相-硬度法,绘制了F690超高强度钢未变形和变形奥氏体的连续冷却转变曲线,研究了形变和冷却速率对F690钢相变行为及显微组织的影响。结果表明:850℃施加30%的变形后,一方面促进了较低冷却速率下(≤10℃/s)下的铁素体和粒状贝氏体相变,扩大了粒状贝氏体相变冷速范围;另一方面抑制了较快冷却速率下的板条贝氏体相变(>10℃/s)。随着冷却速率的提高,显微组织由多边形铁素体+粒状贝氏体向板条贝氏体演变。By thermal dilatometric change referencing microstructure and hardness examination,CCT diagrams of austenite with non-deformation and deformation for ultra-high strength steel were constructed in MMS-200 thermal mechanical simulator.Effects of deformation and cooling-rate on transformation behavior and microstructure of over-cooling austenite were studied.The result shows that 30% deformation at 850 ℃ induce transformation of ferrite and granular bainite（GB）at relative lower cooling rates（≤10 ℃/s）and expands the range of GB,while depresses transformation of lath bainite at higher cooling rates（10 ℃/s）.With increasing cooling-rate,the microstructure evolves from polygonal ferrite（PF）＋（GB）to lath bainite（LB）.

关 键 词：超高强度船板F690 连续冷却转变曲线 奥氏体变形 冷却速率 

分 类 号：TG142.1[一般工业技术—材料科学与工程]