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研究了结构钢单道次焊接接头,尤其是靠近融合线位置的粗晶热影响区(CGHAZ)的组织和力学性能。通常,这个区域的韧性比母材和焊缝金属的韧性要低很多,所以CGHAZ是最容易发生断裂的薄弱位置。重点关注钒微合金化钢板,并且与相同强度级别的铌微合金化钢板进行对比。为了充分利用钒的强化效果,有必要将氮含量提高至0.01%;为优化钢的性能,必须考虑钒与氮的配合。
The microstructures and mechanical properties of single pass welded joints of structural steel, especially CGHAZ near the fusion line, were studied. In general, the toughness of this area is much lower than the toughness of base metal and weld metal, so CGHAZ is the most vulnerable location for rupture. The focus is on vanadium microalloyed steel and is compared with niobium microalloyed steel of the same strength level. In order to fully utilize the strengthening effect of vanadium, it is necessary to increase the nitrogen content to 0.01%. In order to optimize the performance of the steel, the coordination between vanadium and nitrogen must be considered.