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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。
The Gleeble-3500 thermal simulator was used to simulate the heat-affected zone coarse grain region of G3 steel. The simulated line energies were 19,25 kJ / cm for single-wire submerged arc welding and 2 wires for submerged-arc welding Of 39 and 50 kJ / cm. Through the impact test and fracture analysis, the toughness of G3 steel in simulating two-wire submerged arc welding coarse grain region was studied. The results show that the toughness of G3 steel in the coarse grain zone is very poor, and the impact energy is between 1.58 and 1.78 J, both in the single-wire or double-wire submerged arc welding. The fracture mechanisms are both intergranular fracture and cleavage fracture . With the increase of the line energy, the toughness of the coarse grained region of the sample has no significant change, and the material properties of the G3 steel are the main factors that affect the toughness of the coarse grained region.