通过在金红石型药芯焊丝中加入不同含量的金属Mo,研究了Mo对熔敷金属组织及力学性能的影响.研究表明,药芯焊丝中的Mo基本全部过渡到焊缝中;添加微量Mo时,焊缝金属强度显著提升,同时冲击韧性恶化严重;进一步增加Mo含量,焊缝金属强化效果不明显,而冲击性能继续下降.组织分析发现,增加焊丝中的Mo含量,首先会降低奥氏体转变温度,增加基体中的碳化物析出相;继续增加Mo时,碳化物含量减少,但M-A组元含量增加,导致韧性持续下降.
The influence of Mo in the futile-type flux cored wires on microstructure and mechanical properties of the deposited metal was studied.Results show that nearly all the Mo in the wire was transferred to the weld metal.Slight amount of Mo could impressively improve tensile strength but deteriorate the impact toughness.With the content continuing to increase,Mo had a slight effect on strengthening the deposited metal,however,the impact energy continued to decline obviously.Microstructure analysis showed that austenite phase transformation temperature dropped and the precipitated carbides increased with the increasing of Mo content.As Mo content further increased,the carbides was reduced but M-A microstructure increasesd,resulting in a much worse toughness.
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