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利用药皮中的石墨、钛铁、钒铁、金红石等组分 ,通过电弧冶金反应生成了具有高显微硬度的TiC、VC等碳化物 ,探讨了焊条药皮组分石墨、钛铁、钒铁等的含量对焊条工艺性、抗裂性及堆焊层硬度的影响 ,利用X射线衍射、扫描电镜 (SEM )和电子探针 (EMPA)对堆焊层显微组织 ,TiC、VC等碳化物的分布以及断口形貌进行了分析 .研究结果表明 ,堆焊层组织为低碳马氏体 +残余奥氏体 +碳化物 ,碳化物极弥散分布在低碳马氏体基体上 ,断口为准解理断裂 ;堆焊层具有较高塑韧性 ,焊前不预热 ,焊后不缓冷连续堆焊不产生裂纹 ;堆焊层硬度达到HRC5 5以上 ,具有高的耐磨性 ,相对耐磨性优于D6 6 7焊条
TiC, VC and other carbides with high microhardness were formed by arc metallurgy reaction using graphite, ferrotitanium, vanadium iron, rutile and other components in the coating. The effects of graphite coating, ferrotitanium, vanadium iron etc. Of the content on the electrode technology, crack resistance and the hardness of the overlay, the use of X-ray diffraction, scanning electron microscopy (SEM) and electron probe (EMPA) on the surfacing layer microstructure, TiC, VC and other carbide Distribution and fracture morphology were analyzed.The results show that the overlay layer is composed of low-carbon martensite + retained austenite + carbide with a very dispersive carbide distribution on the low-carbon martensite matrix and the fracture is quasi-solution Reasonable fracture; surfacing layer with high plasticity and toughness, without preheating before welding, not cold continuous welding without cracking; surfacing layer hardness HRC5 5 or more, with high wear resistance, the relative wear resistance Better than the D6 6 7 electrode