焊接热输入对微锆处理F40船板钢热影响区组织的影响  

Effects of welding heat input on CGHAZ microstructure of a ship plate steel containing trace zironium

作　　者：梁国俐[1,2,3] 武会宾[2] 杨善武[3] 侯敏[2] 

机构地区：[1]唐山学院机电工程系,河北唐山063000 [2]北京科技大学冶金工程研究院,北京100083 [3]北京科技大学材料科学与工程学院,北京100083

出　　处：《材料热处理学报》2013年第5期76-79,共4页Transactions of Materials and Heat Treatment

基　　金：国家科技支撑计划(2011BAE25B01)

摘　　要：以加入微量锆船板钢为研究对象,采用Gleeble 3500并结合SEM,TEM等实验方法研究了F40船板钢在大热输入焊接条件下焊接热输入对粗晶热影响区(CGHAZ)微观组织形态的影响。结果表明,从800℃冷却到500℃的时间即t8/5=60 s时,组织转变产物为大尺寸、具有尖锐棱边的M-A(马氏体-奥氏体)组元,成为裂纹源和裂纹扩展的通道,对材料的低温韧性造成损害;随T8/5的增大,位错组态由高密度缠结变化为小角度排列和位错网格;析出相粒子存在明显的溶解和长大现象,对位错的钉扎作用减弱。Effects of welding heat input on CGHAZ microstructure of a ship plate steel containing trace zirconium were investigated by means of thermal simulation on a Gleeble 3500 simulator combined with SEM, TEM and impact test. The results show that when the T8/s （ cooling time from 800 ℃ to 500 ℃ ） equals to 60 s, the microstrueture of CGHAZ is the large size M-A with sharp edges, which are the sites for crack nucleation and crack propagation channels, and decrease the low temperature toughness of the steel. With T8/5 increasing, the dislocation configuration changes from the high density entanglement to small angle arrangement and dislocation network. The precipitated phase particles dissolve and grow up obviously, which weaken the action of dislocation pinning.

关 键 词：焊接热输入 F40船板钢 CGHAZ组织形态 

分 类 号：TG115.28[金属学及工艺—物理冶金]