大焊接热输入新型EH40船板热影响区的组织和性能  

Microstructure and properties of high heat- input welding HAZ of new EH40 ship plate steel

作　　者：刘芳芳[1] 付魁军[1] 王佳骥[1] 及玉梅[1] 蒋健博[1] 

机构地区：[1]鞍钢股份有限公司技术中心,鞍山市114009

出　　处：《焊接》2013年第3期25-30,70,共6页Welding & Joining

基　　金：国家科技支撑计划(2006BAE03A15)

摘　　要：采用热模拟技术,研究了不同峰值温度T_m(1 350~750℃)、不同冷却速度(时间t_(8/5)为50~400 s)和不同二次循环制度(1 300℃+1 300℃,1 300℃+820℃,820℃+1 300℃,820℃+820℃)对新型EH40船板焊接热影响区(HAZ)性能和组织的影响。结果表明:峰值温度T_m为1 350℃时,冲击吸收能量最低,与母材相比,晶粒有长大的现象但并不严重;时间t_(8/5)为100 s时,冲击吸收能量最低,因为此冷却速度下生成长条状具有方向性的M-A组元,为裂纹的形成和扩展提供了条件,导致韧性下降;二次热循环作用下低温冲击韧性良好。各个热循环制度下的全部试样-20℃冲击吸收能量均高于200 J,表明了新型EH40船板良好的焊接性。Welding thermal simulation was used to investigated the effect of different peak temperature T_m(1350℃~750℃),cooling time from 800℃ to 500℃(t_(8/5):50 s^400 s) and the peak temperatures of the second thermal cycle(1 300 ℃ + 1 300 ℃,1 300 ℃ + 820 ℃,820 ℃ + 1300℃,820℃ + 820℃) on the microstructure and properties in HAZ of new EH40 ship plate.The experimental results indicated the toughness value is lowest at the peak temperature of 1 350 ℃,and the grains are coarse but not serious;When the t_(8/5) is 100 s,the toughness value is lowest because M- A constituents are bacillary form and they are propitious to crack.At the different peak temperatures of the second thermal cycle,the toughness is well.The toughness values at- 20 X.of all samples experienced the thermal cycle are higher than 200J,which indicates the new EH40 ship plate steel has good weldability.

关 键 词：船板 焊接热循环 热影响区 组织和性能 

分 类 号：TG457.11[金属学及工艺—焊接]