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采用三种焊接热输入对新开发的低碳贝氏体ADB610钢进行焊接,对其焊接接头的微观组织和力学性能进行了试验研究。结果表明,焊接接头的母材区、焊缝区和热影响区组织均为铁素体和贝氏体,在铁素体和贝氏体上还弥散分布着渗碳体;焊接热输入对焊缝区组织和冲击性能影响显著,过大的焊接热输入会使焊缝区贝氏体含量减少,铁素体含量增大,晶粒变粗大,冲击韧性明显降低。
The newly developed low carbon bainite ADB610 steel was welded by three welding heat inputs, and the microstructure and mechanical properties of the welded joints were studied. The results show that the base metal zone, weld zone and heat affected zone are all ferrite and bainite, and the cementite is dispersed and distributed on the ferrite and bainite. The welding heat input butt welding The influence of the microstructure and impact performance of the seam is significant. If the welding heat input is too large, the bainite content in the weld zone decreases, the ferrite content increases, the grains become coarse and the impact toughness decreases obviously.