G3钢双丝埋弧焊粗晶区韧性的焊接热模拟研究  

Research on Coarse Grain Zone Toughness of G3 Steel Welded with Double-wire Submerged Arc Welding Based on Thermal Simulation

作　　者：欧阳文凯 陈冰泉[1] 黄永溪 

机构地区：[1]武汉理工大学华夏学院,湖北武汉430223 [2]中钢邢台机械轧辊有限公司修复公司,河北邢台054025

出　　处：《热加工工艺》2016年第1期202-203,208,共3页Hot Working Technology

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.

关 键 词：热模拟 冲击性能 双丝埋弧焊 

分 类 号：TG457.11[金属学及工艺—焊接] TG445