WB36钢多层焊接头近缝区网状组织研究(Ⅰ)：物理模拟  

Study on net-like microstructure in the heat affected zone of multilayer WB36 steel weldment(Ⅰ): physical simulation

作　　者：王学[1] 常建伟 黄关政 章应霖[1] 李朝志[1] 

机构地区：[1]武汉大学动力与机械学院,湖北武汉430072 [2]河南第一火电建设公司,河南平顶山467031

出　　处：《材料热处理学报》2009年第1期183-187,共5页Transactions of Materials and Heat Treatment

摘　　要：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 microstructure in HAZ of WB36 steel（15NiCuMoNb5） multi-layer welded joint was observed, a net-like micmstructure （NM）zone with size of 0.5mm × 1mm forms in the HAZ closed to the fusion line. The NM was simulated and reproduced by using welding thermal simulation experiments to investigate the mechanism of NM formation. Experimental results and analysis show that the NM occurs at the overlapping HAZs of neighboufing welding layers. There are two kinds of thermal cycle conditions resulting in the formation of NM ： 1 ） having been experienced the double thermal cycles, the fist is the cycle of the coarse grained zone, the secondary is cycle at an peak temperature of A c1 - A c3 ; 2）having been experienced three welding thermal cycles, the first and secondary cycles are both the cycle of the coarse grained zone, the third is cycle at an peak temperature of AC1-AC3 .

关 键 词：低合金高强钢 多层焊 热影响区 组织 热模拟 

分 类 号：TG142.1[一般工业技术—材料科学与工程]