本文研究了埋弧焊焊缝金属中,微量元素的交互作用。研究表明,稀土可有效地保护钛过渡,并促进有效硼向奥氏体晶介的偏聚;钛使先共析铁素体量减少,针状铁素体量增加,从而增加强度和硬度;焊缝中加入少量稀土,使钛达最佳含量值时,可明显改善低温韧性;韧性最佳峰值的稀土加入量及钛、硼含量,系取决于焊剂、焊丝的类型及氧、氮含量。本文用α-粒子径迹分析法研究了硼的分布状态;用扫描电镜和透射电镜研究了焊缝金属中夹杂物的相成分和相结构,并分析了它在针状铁素体形核中的作用。 This paper studies the interaction of trace elements in the submerged arc welding metal. The results show that rare earth can effectively protect the transition of titanium and promote the segregation of effective boron into austenite. Titanium reduces the amount of proeutectoid ferrite and the amount of acicular ferrite, thus increasing the strength and hardness. The addition of a small amount of rare earth rare earth, so that the best titanium content, can significantly improve the low temperature toughness; the best toughness peak rare earth addition and titanium, boron content, depends on the flux, wire type and oxygen, nitrogen content. In this paper, the distribution of boron was studied by α-particle track analysis. The phase composition and phase structure of the inclusions in the weld metal were studied by scanning electron microscope and transmission electron microscope. effect.