载货车前梁用20Mn2SiVB非调质钢的研究  

Research on 20Mn2SiVB Non-Quenched and Tempered Steel Used as Front Frame of Trucks

作　　者：吴化[1] 闫肃[1] 杨福平[2] 刘云旭[1] 

机构地区：[1]长春工业大学材料科学与工程学院,吉林长春130012 [2]第一汽车集团公司技术中心,吉林长春130011

出　　处：《汽车工艺与材料》2005年第11期23-26,共4页Automobile Technology & Material

摘　　要：根据钢的过冷奥氏体曲线(CCT图)与其显微组织和力学性能之间的关系,设计了非调质钢的化学成分2M0nS2iVB;分析了该钢种在不同热处理条件下的显微组织和力学性能之间的关系。试验结果表明:20M n2SiVB钢经锻后空冷可得到以贝氏体为主的显微组织,并且具有强韧性配合良好的力学性能,可代替调质钢制造载货车前梁;钢组织中少量富碳残余奥氏体的存在能够阻止裂纹扩展,提高钢的韧性。According to continuous cooling transformation （CCT）diagrams of steels and the relationship between CCT diagrams,microstructures and mechanical properties,a non-quenched and tempered steel 20Mn2SiVB was designed, and the relationships between microstructures and mechanical properties thereof under different heat treatment processing were analyzed. Results showed that,by means of controlling cooling after forging,20Mn2SiVB steel could be obtained with the microstructurcs consisting mostly of bainites while the mechanical properties combined with excellent strength and toughness.The 20Mn2SiVB steel can replace the quenched and tempered steel to be used for front frame of trucks. The existence of rich carbon retained austenite in 20Mn2SiVB steel can arrest propagating cracks and enhance the toughness.

关 键 词：非调质钢 残余奥氏体 力学性能 

分 类 号：TG142.41[一般工业技术—材料科学与工程]