【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 ,并研制出此类高强高韧钢更多还原

【Abstract】 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.更多还原