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通过调节Cr、V元素在Fe-Cr-V-C系合金成分中的组成,以及整个合金体系在焊条药皮中的比例,研究了一种通过手工电弧焊的焊条药皮过渡合金到堆焊层,在堆焊层中原位合成陶瓷硬质相的耐磨焊条。对所配焊条进行手工堆焊,通过硬度和磨损试验得到宏观性能的规律,并利用XRD、EDS和SEM分析了堆焊层的物相组成、组织形态及分布情况。结果表明,堆焊层的力学性能随着铬、钒含量的增加而变化,当铬在焊条药皮中含量为17.4%、钒含量为11.6%时,堆焊层硬度和磨损性能达到最佳值,且有较好的抗裂性。堆焊层中碳化钒的形成数量随V含量的增大而增加,多数呈点状,少数呈十字状、棒状,弥散分布在马氏体+残余奥氏体基体中,与晶界分布的网状(Fe,Cr)7C3耐磨骨架构成复合相,显著提高了堆焊层的耐磨性能。
By adjusting the composition of Cr, V elements in the composition of Fe-Cr-VC alloy, and the proportion of the alloy system in the electrode coating, a welding flux coating alloy by hand arc welding was studied to the overlay, Wear-resistant electrode of ceramic hard phase synthesized in-situ in the surfacing layer. The welding electrodes were prepared by hand welding, and the macroscopic properties were obtained by hardness and wear tests. The phase composition, microstructure and distribution of the overlay were analyzed by XRD, EDS and SEM. The results show that the mechanical properties of the overlay are changed with the increase of chromium and vanadium content. The hardness and wear properties of the overlay are optimized when the content of Cr in the coating is 17.4% and the content of vanadium is 11.6% , And has better crack resistance. The formation of vanadium carbide in the surfacing layer increases with the increase of V content, most of them are dot-like, a few are cross-shaped, rod-shaped, dispersed in martensite + retained austenite matrix, and the grain boundary distribution network The (Fe, Cr) 7C3 wear-resisting skeleton forms a composite phase, which significantly improves the wear resistance of the overlay.