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本文研究了微量硼、钛对埋弧焊熔敷金属组织和韧性的影响,并对硼、钛作用的机理进行了分析。结果表明:通过还原焊剂中的B_2O_3和TiO_2向熔敷金属中过渡0.0060～0.010％硼和0.030～0.035％钛,可以获得均匀、细小的针状铁素体组织,从而改善低温韧性。TiO是诱发针状铁素体形核的有效形核剂。硼的分布和状态分析表明,一定数量的固溶硼存在于奥氏体晶界附近,可以减小晶界先共析铁素体的宽度,并细化晶界铁素体晶粒。
In this paper, the effect of trace boron and titanium on the microstructure and toughness of submerged arc welded metal was investigated. The mechanism of boron and titanium interaction was also analyzed. The results show that uniform and fine acicular ferrite structure can be obtained by reducing B_2O_3 and TiO_2 in the flux to 0.0060 ~ 0.010% boron and 0.030 ~ 0.035% titanium in the deposited metal to improve the low temperature toughness. TiO is an effective nucleating agent that induces acicular ferrite nucleation. The distribution and state analysis of boron show that a certain amount of solid solution boron exists near the austenite grain boundaries, which can reduce the grain boundary proeutectoid ferrite width and refine grain boundary ferrite grains.