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采用高能束CO2激光在铸钢表面熔覆了含有碳氮化钛增强粒子的铁基熔覆层。利用X射线衍射(XRD)、金相显微镜(OM)和透射电镜(TEM)对激光熔覆层的微观组织进行分析与研究。结果表明:先前加入的颗粒状TiN与石墨粉在激光熔覆过程中发生了反应,原位自生了新的颗粒状强化相Ti(C0.3N0.7)。熔覆层中Ti(C0.3N0.7)的形貌特征多呈尺寸不等近似菱形颗粒及其他不规则形状,尺寸大小在0.1～3.0μm,它们弥散分布在熔覆层(α-Fe)基体中,基体组织呈现出胞状树枝晶特征,熔覆层与母材形成良好的冶金结合。Ti(C0.3N0.7)颗粒与熔覆层α-Fe基体间界面干净光滑,结合紧密。
High-energy beam CO2 laser is used to coat the cast steel surface with an iron-based cladding layer containing titanium carbonitride reinforcing particles. The microstructure of laser cladding layer was analyzed by X-ray diffraction (XRD), optical microscope (OM) and transmission electron microscope (TEM). The results show that the previously added granular TiN reacts with the graphite powder during the laser cladding process, and the new granular strengthening phase Ti (C0.3N0.7) is generated in situ. The morphology of Ti (C0.3N0.7) in the coating is mostly diamond particles and other irregular shapes ranging in size from 0.1μm to 3.0μm. They are dispersed in the coating (α-Fe) Matrix, the matrix showed dendritic cell characteristics, the cladding layer and the base metal to form a good metallurgical bond. The interface between Ti (C0.3N0.7) particles and α-Fe matrix is clean, smooth and close together.