摘要
使用Gleeble-3500热模拟试验机对G3钢试样进行焊接热影响区粗晶区的热模拟试验,模拟的线能量分别为单丝埋弧焊的19、25 kJ/cm和双丝埋弧焊的39和50 kJ/cm。通过冲击试验和断口分析,研究了G3钢模拟双丝埋弧焊粗晶区的韧性。结果表明,无论在单丝还是双丝埋弧焊的线能量下,G3钢粗晶区的韧性均很差,冲击功在1.58~1.78 J之间,断裂机制均为沿晶断裂＋解理断裂。随着线能量的增加,试样粗晶区的韧性无显著变化,G3钢本身材料特性是影响其粗晶区韧性的主要原因。
By thermal simulated test machine Gleeble 3500, the thermal simulation of coarse grain zone of G3 steel was carried out. The simulated heat input was 19KJ/cm and 25KJ/cm for one wire submerged arc welding, 39KJ/cm and 50KJ/cm for two-wire submerged arc welding, respectively. With the aid of impact test and fracture analysis, the toughness of simulated coarse crystal zone of two-wire submerged arc welding for G3 steel was studied. The testing results show that the toughness of coarse grain zone of G3 steel is very poor no matter under what heat input, impact work of all samples are between 1.58-1.78 J,and their fracture mechanism is intercrystalline rupture ＋ cleavage fracture. There is no change of the coarse grain zone toughness along with the increase of heat input.The properties of G3 steel is the main reason which can influence on the toughness of coarse grain zone.
出处
《热加工工艺》
CSCD
北大核心
2016年第1期202-203,208,共3页
Hot Working Technology
关键词
热模拟
冲击性能
双丝埋弧焊
thermal simulation
impact property
double wire submerged arc welding
