【摘要】 通过在焊条药皮中加入稀土硅铁、稀土氧化物向焊缝金属过渡稀土元素的方法 ,深入研究了稀土对焊缝组织和性能的影响。研究结果表明 ,稀土对焊缝金属起着变质和净化的作用 ,能够显著改善焊缝金属组织、细化晶粒、增加针状铁素数量 ,减少M -A组元 ,改变夹杂物的形态、大小和分布 ,大大提高了焊缝金属的低温冲击韧性更多还原

【Abstract】 In this paper,the effect of rare earth elements on the structure and properties of the weld metal was studied through adding RE ferrosilicon and rare earths to the coatings of the welding electrodes.It is shown experimentally that adding appropriate amount of rare earth additions in the coating of welding electrodes can modify and purify the weld metal,improve the structure of the weld metal,refine the grains, increase the amount of acicular ferrite,decrease the amount of the M-A component,alter the shape,size and distribution of the non-metallic inclusions,thereby the notch toughness of the weld metal at low temperature can be increased greatly.更多还原