摘要
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
Using the compounding of graphite, Fe-Ti, Fe-V and rutile, the carbides TiC and VC with high micro hardness,were formed by arc metallurgic reaction. The effect of the contents of graphite, Fe-Ti, and Fe-V in the coat on the crack resistance and hardness of hardfacing metal were also discussed. The microstructure, fracture feature of hardfacing metal and distribution of TiC,VC in the matrix were analyzed by means of X ray diffraction, SEM and EMPA. The results show that the microstructure of hardfacing metal was lath martensite and retained austenite with carbides which are dispersively distributed in the matrix. The hardfacing metal has high plasticity and ductility. Its hardness was more than HRC55, however, the crack of hardfacing metal did not occur even under conditions of non preheating and non postheating. The hardfacing metal has a high wear resistance, and its relative wearability is better than that of D667.
出处
《材料科学与工艺》
EI
CAS
CSCD
2001年第4期397-401,共5页
Materials Science and Technology
基金
山东省自然科学基金资助项目 (Z2 0 0 0F0 2 )
