HAZ Toughness in Vanadium-microalloyed Steels
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摘要: 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。Abstract: The present paper refers to the situation of single-pass welds in structural steels and,in particular,the mechanical properties and microstructures of the coarse grained heat affected zones (CGHAZs) that exist in the parent material close to the fusion line. Frequently,the toughness in these areas is lower than that of either the base steel or the weld metal and so they may represent the weakest link in the structure with respect to fracture. We concentrate on the characteristics of a vanadium-microalloyed plate but a similar strength niobium steel is included as a relevant comparison. To best utilize the strengthening effect of vanadium in steel it is necessary to enhance the nitrogen level to typically 0.01% and it is the combination of V and N that must be considered when attempting to rationalize the properties of the steels.
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