Cr对高强钢焊条焊缝组织和性能的影响

摘要

基于Ni-Cr-Mo-V合金体系，研究了Cr对800 MPa高强钢焊条焊缝组织和性能的影响。研究结果表明，当w （Cr）<1.2%时，随着Cr 含量的增加，焊缝金属强度和韧性逐渐升高；当w （Cr）＞1.2%时，随着Cr含量的增加，焊缝金属强度逐渐升高，而韧性逐渐降低。焊缝熔敷金属中w(Cr)=1.2%时，可以使焊缝金属获得大量细小、均匀的粒状M/A组织，从而提高了焊缝的强度和韧性。%Based on Ni-Cr-Mo-V alloy system, it studied the effect of chrome on weld microstructure and mechanical properties of 800 MPa high strength steel electrode. Experimental results showed that, as the content of chrome less-than 1.2%, the weld metal strength and toughness gradually increase with the increase of the content of Cr;and when the content of chrome more-than 1.2%, the strength of weld metal gradually increases and the toughness gradually decreases with the increase of the content of Cr. As the content of Cr is 1.2%, the microstructure of weld metal is large number of wee and homogeneous M/A, which can enhance the strength and toughness of weld metal.