本文通过焊条药皮向低台金钢焊缝中掺入钇的方法,研究钇对焊缝组织形态和低温韧性的影响。研究结果表明:在低合金钢焊缝中掺入适量钇可使沿晶界析出的粗大的先共析铁素体和侧板条铁素体的比例减小,而使细小的针状铁素体比例大大增加,晶粒细化,从而提高焊缝的低温韧性。 In this paper, the method of yttrium doping yttrium into the weld of low-alloyed steel by electrode coating was used to study the effect of yttrium on the microstructure and low-temperature toughness of the weld. The results show that the incorporation of appropriate amount of yttrium in the weld of low-alloy steel can reduce the proportion of coarse pro-eutectoid ferrite and side-strip ferrite precipitated along the grain boundaries, and make fine acicular ferrite The proportion of the body is greatly increased, grain refinement, thereby enhancing the low temperature toughness of the weld.