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分析了WB36钢多层焊接头热影响区的组织特点,发现某些焊层熔合线附近的局部区域存在沿晶网状组织,网状组织区域大小约0.5mm×1mm。通过热模拟方法再现了这种沿晶分布的网状组织,揭示了其形成的焊接热循环条件。结果表明,网状组织区域处于相邻焊层热影响区的重叠区域,形成网状组织的热循环有两种:1)受到两次热循环作用,第一次为粗晶区的热循环,第二次为峰值温度在AC1~AC3的不完全重结晶区的热循环;2)受到三次热循环作用,第一、二次为粗晶区的热循环,第三次为峰值温度在AC1~AC3不完全重结晶区的热循环。
The microstructures of the heat-affected zone of WB36 steel multi-layer welded joint were analyzed. It was found that the local area near the fusion line of some welding layers existed along the reticular network. The size of reticular tissue was about 0.5mm × 1mm. The reticular distribution of this intergranular structure was reproduced by the thermal simulation method, revealing the formation of the welding thermal cycling conditions. The results show that the reticular structure is in the overlapping region of the heat affected zone of the adjacent welding layer, and there are two kinds of thermal cycling in the reticular formation: 1) it is subjected to two thermal cycles, the first is the thermal cycling in the coarse- The second is the thermal cycling with peak temperature in the region of incomplete recrystallization of AC1 ~ AC3; 2) the thermal cycling is performed by three thermal cycles, the first and the second are the thermal cycling in the coarse-grained region, the third is the peak temperature in AC1 ~ AC3 Incomplete recrystallization zone thermal cycling.