膜式水冷壁单面堆焊热影响区组织研究  

Microstructure of heat affected zone for single-side surface welding of membrane water-wall

作　　者：陈传宝 魏明震 周健[1] 薛烽[1] CHEN Chuanbao;WEI Mingzhen;ZHOU Jian;XUE Feng(College of Materials Science and Engineering,Southeast University,Nanjing 211189,China)

机构地区：[1]东南大学材料科学与工程学院,江苏南京211189

出　　处：《现代交通与冶金材料》2021年第5期78-83,共6页Modern Transportation and Metallurgical Materials

摘　　要：基于ANSYS软件模拟分析了三种不同热输入量对膜式水冷壁堆焊过程中的瞬态温度场影响,并且利用实验和模拟结果分析了热输入量对焊接热影响区组织形貌影响。温度场模拟结果表明,加热过程中热源所到达的位置,温度迅速达到熔点,热源离开后温度迅速降低到600℃左右。随着热输入的增加,熔池的最高温度逐渐增加,温差达到100℃以上,而冷却速度逐渐变慢,使得熔池变深,焊缝热影响区宽度变大;组织中铁素体含量增多,珠光体含量降低,并出现了魏氏组织。The effects of three different heat input on transient temperature field of membrane water-wall during surface welding were simulated by ANSYS, and the influence of heat inputs on the weld microstructure morphology of welding heat-affected zone was analyzed by experimental and simulation results. The results of temperature field simulation showed that when the heat source approached during the heating process, the temperature of the position reached the melting point rapidly. After the heat source leaved, the temperature quickly dropped to 600 ℃. With the heat input increasing, the maximum temperature of the molten pool increased, and the difference of temperature reached 100 ℃ or more, but the cooling rate was slower. The thickness of the welding bead increased, the width of heat affected zone became larger, the number of columnar crystals grain decreased, and the number of equiaxed crystals grain increased. Besides, the content of ferrite increased, while the content of pearlite decreased and the Widmannstatten structure appeared.

关 键 词：堆焊 膜式水冷壁 显微组织 数值模拟 

分 类 号：TG455[金属学及工艺—焊接]