1100 MPa级重型机械超高强吊臂钢焊接性能研究  

Study on Welding Performances of 1100 MPa Grade Ultra High Strength Steel for Lifting Arm of Heavy Machinery

作　　者：李浩[1] 薛越[1] 戴鑫[1] 张军[1] 柳婕[1] 黄利[2] Li Hao;Xue Yue;Dai Xin;Zhang Jun;Liu Jie;Huang Li(CSP Plant of Inner Mongolia Baotou Steel Union Co.,Ltd.,Baotou 014010,Inner Mongolia Autonomous Region,China;Technical Center of Inner Mongolia Baotou Steel Union Co.,Ltd.,Baotou 014010,Inner Mongolia Autonomous Region,China)

机构地区：[1]内蒙古包钢钢联股份有限公司薄板坯连铸连轧厂,内蒙古包头014010 [2]内蒙古包钢钢联股份有限公司技术中心,内蒙古包头014010

出　　处：《包钢科技》2023年第5期66-70,共5页Science & Technology of Baotou Steel

摘　　要：通过Gleeble-3800试验机进行焊接过程热模拟,得出了Q1100D钢冷却过程中的CCT曲线。采用斜Y坡口焊接冷裂纹试验、金相分析和力学性能测试等方法,对不同热输入下焊接接头组织与性能进行了检测,结果表明包钢Q1100D重型机械超高强吊臂钢具有较好的抗冷裂性能。小热输入条件下可以实现室温下不预热焊接;较大热输入条件下,表面和断面未见冷裂纹,说明Q1100D钢板具有较好的抗冷裂性能。接头综合力学性能与组织性能评价结果表明,14 mm厚Q1100D钢板在1.05 kJ/mm的热输入下,焊接接头力学性能(拉伸、弯曲、冲击)处于最优状态。The continuous cooling transformation(CCT)curves of Q1100D steel in cooling process are obtained through the thermal simulation of welding process with Gleeble-3800 testing machine.The microstructure and properties of welded joints under different heat inputs are tested with such methods as the Y-slit welding cold crack test,metallographic analysis and mechanical performance test.The results showed that the ultra high strength steel Q1100D for lifting arm of heavy machinery of Baotou Steel was with better cold check resistance.It could be welded without preheating at room temperature with the condition of a little heat input;with the condition of greater heat input,cold cracks are not observed on the surface and cross section,which indicates that Q1100D steel plate is with good cold check resistance.The evaluation results of comprehensive mechanical and structure properties of the joint indicate that the Q1100D steel plate with thickness of 14 mm is with optimum mechanical properties(tensile,bending and impact)of welded joint under heat input of 1.05 kJ/mm.

关 键 词：高强钢 焊接性 热输入 金相组织 

分 类 号：TG457.11[金属学及工艺—焊接]