贝氏体钢的强韧化途径  

The Ways to Improve Strength and Toughness of Bainitic Steel

作　　者：方鸿生[1] 刘东雨[1] 徐平光[1] 白秉哲[1] 杨志刚[1] 

机构地区：[1]清华大学材料科学与工程系教育部先进材料实验室,北京100084

出　　处：《机械工程材料》2001年第6期1-5,41,共6页Materials For Mechanical Engineering

摘　　要：发现在粒状贝氏体组织中 ,控制其小岛尺寸、数量和分布 ,可获良好强韧性 ,研制出粒状贝氏体钢。首次用断续的仿晶界型铁素体作韧性相与粒贝结合 ,可获优良强韧性 ,并研制出此类复相钢。通过合金设计 ,在空冷条件下获得具有超精细结构的无碳化物贝氏体 /马氏体复相组织 ,贝氏体各层次单元由奥氏体膜包围 ,使贝氏体 /马氏体复相组织具有优良的强韧性 。The combination of strength and toughness can be improved in granular bainite microstructure (B g) by controlling the size, amount and distribution of martensite/austenite islands(M/A islands). Based on this discovery, a new granular bainite steel has been first developed. The combination of grain boundary allotrimorphic ferrite (F GBA ) with granular bainite lead to a new F GBA /B g duplex steel in the world. By suitable alloy composition design, a new air cooling carbide free bainite/martensite (CFB/M) steel with ultra fine microstructure has been developed. The bainite units of different grade is surround by retained austenite. The CFB/M duplex steel exhibits a good combination of strength and toughness.

关 键 词：强韧性 粒状贝氏体 仿晶界型铁素体 贝氏体/巴氏体复相组织 贝氏体钢 

分 类 号：TG142.2[一般工业技术—材料科学与工程]