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利用激光熔覆技术在工件表面进行改性处理,形成铁基合金熔覆层。采用金相显微镜(OM)、透射电镜(TEM)、扫描电镜(SEM)和电子探针(EPMA)研究了激光熔覆FeCrBSi铁基合金涂层中裂纹的形态和断口的成分,分析了复合涂层中裂纹形成的机理。研究结果表明,若选择的激光熔覆工艺不当,熔覆层基体易产生裂纹,其形态主要有横向裂纹和纵向裂纹两种。熔覆层中的气孔及断口聚集含Cr、O、Si等元素的夹杂缺陷是内部裂纹断裂的根源,熔覆层中裂纹大多起源于熔覆层与母材交界处,即熔覆层底部熔合线附近。熔覆层的裂纹可以是沿晶或穿晶断裂,断口形貌呈现解理断裂或准解理断裂形态。
The use of laser cladding technology in the workpiece surface modification, the formation of iron-based alloy cladding. The morphology and fracture of the cracks in the FeCrBSi iron-based alloy coating were investigated by OM, TEM, EPMA and EPMA. The effects of composite coating Layer cracks in the formation mechanism. The results show that if the selected laser cladding process is improper, the matrix of the cladding layer tends to crack easily, and the morphology of the cladding layer is mainly transverse crack and longitudinal crack. Stomatal and fracture aggregation in the cladding layer Inclusion defects containing Cr, O, Si and other elements are the source of internal crack fracture. Most of the cracks in the cladding layer originate from the junction of the cladding layer and the base metal, ie, the bottom of the cladding layer is fused Near the line. Cracks in the cladding layer may be along the crystal or transgranular fracture, fracture morphology showing cleavage fracture or quasi-cleavage fracture morphology.