论文部分内容阅读
通过合理的成分设计制备了一种大热输入药芯焊丝,在实验室进行了大热输入焊接试验,研究在大热输入焊接条件下焊缝金属的组织与韧性。结果表明:在热输入量为360 k J/cm大热输入焊接条件下,焊缝金属中形成了大量的细小弥散分布的夹杂物,并以夹杂物为核心诱导生成了相互交叉互锁的针状铁素体(AF)组织,AF晶粒间形成了大量的大角度晶界结构,是焊缝金属具有较高的冲击韧性的原因;通过进一步对夹杂物组成进行分析,发现在夹杂物周围形成了贫锰区,确定了贫锰区机制为夹杂物形成AF相变机理。
A kind of large heat input flux cored wire was designed and produced by reasonable composition. The heat input welding test was conducted in the laboratory to study the microstructure and toughness of the weld metal under the condition of large heat input welding. The results show that a large number of finely dispersed inclusions are formed in the weld metal under the heat input welding conditions of 360 kJ / cm, and the inclusions as the core induce the cross-interlocking needles Ferrite (AF) and AF grains formed a large number of large-angle grain boundary structure, which is the reason of high impact toughness of weld metal. By further analyzing the composition of inclusions, The formation of a poor manganese area, determined that the mechanism of manganese depleted areas for the formation of inclusions AF phase transition mechanism.