大热输入焊接DH36钢焊接粗晶区组织与性能分析
Coarse grained region microstructure and properties of high heat input welding DH36 steels
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摘要: 利用焊接热模拟的方法,对比研究了大热输入焊接DH36钢焊接粗晶区的组织与性能.结果表明,低碳、低锰及低碳当量+微钛处理的合金设计可显著改善钢大热输入焊接粗晶区的组织与性能.随着t8/5的增大,大热输入焊接DH36钢粗晶区的组织由细小(尺寸<1μm)的板条状马氏体-奥氏体岛(M-A岛)组织转变为大尺寸块状M-A岛组织,同时组织中先共析铁素体数量增多,尺寸增大.降低钢中的Mn元素含量可显著促进先共析铁素体的形成,抑制硬质相M-A岛的产生,但过多的粗大先共析铁素体形成会降低HAZ的低温韧性.M-A岛和先共析铁素体共同作用决定着大热输入HAZ的性能.Abstract: By using welding thermal simulation technology,coarse grained region microstructure and properties of high heat input welding DH36 steel were studied.The results show that low C,low Mn and low carbon equivalent with Ti treatment alloy design significantly improve the toughness of coarse grained region.The microstructures of coarse grained region change from thin lath M-A island to massive M-A island,and the amount of pro-eutectoid ferrite increases with the increasing of t8/5.The island with size larger than 1 μm shows significantly effect on the toughness of coarse grained region.Decreasing the Mn content can promote the formation pro-eutectoid ferrite and inhibit the formation of M-A hard phase at the same time,but excessive coarsening pro-eutectoid ferrite will decrease the low temperature toughness of coarse-grain HAZ obviously.The interaction of the M-A islands and pro-eutectoid ferrite affect the high heat input welding mechanical properties of DH36 steels.
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