EH40钢板模拟焊接热影响区组织与性能  

Microstructure and property of EH40 steel plate in simulative welding HAZ

作　　者：王佳骥[1] 付魁军[1] 及玉梅[1] 刘芳芳[1] 

机构地区：[1]鞍钢股份有限公司技术中心,辽宁鞍山114009

出　　处：《金属热处理》2011年第6期37-40,共4页Heat Treatment of Metals

基　　金：国家科技支撑计划(2006BAE03A15)

摘　　要：利用热模拟技术及光学显微镜、透射电镜研究了在不同冷却时间(t8/5)条件下,大能量焊接EH40钢板模拟焊接热影响区组织和性能的变化规律。试验结果表明,模拟焊接热影响区组织主要是由粒状贝氏体、铁素体和珠光体组成;随着t8/5时间的增加,焊接热影响区的组织由粒状贝氏体和少量的准多边形铁素体组成转变为以粗大的等轴铁素体和珠光体为主,同时M-A岛的数量先增多后减少,尺寸逐渐增大,形状也由块状变为长条状,大颗粒状的M-A岛极易引起脆性解理断裂,导致冲击韧性下降;模拟焊接热影响区的冲击韧性总体水平较高,随着冷却时间(t8/5)的增加,韧性呈现出先降低后升高再降低的趋势。The microstructure and toughness in heat affected zone（HAZ） of EH40 steel were studied with thermal simulation,optical microstructure and TEM.The results show that the microstructure of heat affected zone is consisted of granular bainite,ferrite and pearlite.With the t8/5 increasing,the microstructure in HAZ transformed granular bainite and a little quasi-polygonal ferrite into coarse equiaxed ferrite and pearlite.The quantity of M-A constituent increases first but decreases later with the size increasing,and the shape converts from block to strip.The massive M-A constituent causes brittle cleavage fracture easily so as to decrease the impact toughness of HAZ.After thermal simulation the impact toughness of HAZ is relatively high,and decreases first but increases later,and then finally decreases.

关 键 词：大线能量焊接 EH40钢板 热模拟 冷却时间 热影响区 M-A岛 

分 类 号：TG142.1[一般工业技术—材料科学与工程]