热处理对ER90S-G焊丝熔敷金属组织与性能的影响  

Effect of heat treatment on the microstructure and properties of the deposited metal of ER90S-G wires

作　　者：冯义正 马尚博 王凌宇 许祥平[1] 邹家生[1] FENG Yizheng;MA Shangbo;WANG Lingyu;XU Xiangping;ZOU Jiasheng(School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,China)

机构地区：[1]江苏科技大学材料科学与工程学院,镇江212100

出　　处：《江苏科技大学学报(自然科学版)》2025年第1期42-47,共6页Journal of Jiangsu University of Science and Technology:Natural Science Edition

摘　　要：4种不同化学成分ER90S-G焊丝熔敷金属组织和性能存在差异,针对性能最佳的焊丝研究其在不同焊接电流和热处理条件下组织和性能的变化,探究合适的焊接工艺参数和热处理条件.试验结果表明:4种焊丝熔敷金属组织基本均由针状铁素体构成,力学性能均满足设计要求;随着焊接电流的增加,熔敷金属的拉伸性能先升高后降低,0、-45、-50℃冲击吸收功均大于54 J,满足标准要求.焊接电流为180~190 A时,熔敷金属综合力学性能较好;随着热处理时间的增加,熔敷金属的拉伸性能略有下降,冲击韧性总体呈先升高后降低的趋势.热处理条件为610℃×10 h时,熔敷金属综合力学性能较好.熔敷金属经过610℃×10 h热处理后,并未发生回火脆性,降低了韧脆转变温度;熔敷金属-45℃冲击断口微观形貌中存在大量孔坑和韧窝,断裂机理为微孔聚集型断裂.热处理后其中韧窝形状更加规整,熔敷金属塑性和韧性降低.The differences of microstructure and properties of deposited metal of four kinds of ER90S-G welding wires with different chemical compositions were studied,and the changes of microstructure and properties of the welding wire with the best performance under different welding current and heat treatment conditions were found,so as to find the appropriate welding process parameters and heat treatment conditions.The test results show that the deposited metal structures of four kinds of welding wires are basically composed of acicular ferrite,and their mechanical properties meet the design requirements.With the increase of welding current,the tensile properties of deposited metal first increase and then decrease,and the impact absorption work at 0,-45 and-50℃is greater than 54 J,which meets the standard requirements.When the welding current is 180~190 A,the comprehensive mechanical properties of deposited metal are better.With the increase of heat treatment time,the tensile properties of deposited metal decrease slightly,and the overall impact toughness increases first and then decreases.When the heat treatment condition is 610℃×10 h,the comprehensive mechanical properties of deposited metal are better.After heat treatment at 610℃×10 h,the deposited metal does not have temper brittleness,which reduces the ductile-brittle transition temperature.There are a lot of pits and dimples in the micro-morphology of impact fracture of deposited metal at-45℃,and the fracture mechanism is micropore aggregation fracture.After heat treatment,the dimple shape is more regular,and the plasticity and toughness of deposited metal are reduced.

关 键 词：热处理 ER90S-G 熔敷金属 微观组织 力学性能 

分 类 号：TG424[金属学及工艺—焊接]