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采用高能束横流HL-5000型CO2激光器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)和能谱EDAX对熔覆层进行了分析,并采用光学显微硬度计对熔覆层的硬度进行了测试。利用金相显微镜(OM)和扫描电镜(SEM)对激光熔覆层的微观组织进行了研究。结果表明:Ti(C0.3N0.7)可以通过原位反应合成,新的颗粒状强化相Ti(C0.3N0.7)的形貌特征多呈不规则形状,弥散分布在熔覆层基体中。熔覆层与母材形成良好的冶金结合,熔覆层内为方向性强的胞状树枝晶,晶粒细小。熔覆层的显微硬度HV0.3达到730~850。
High-energy beam cross-flow HL-5000 CO2 laser was used to coat the cast steel surface with an iron-based cladding layer containing titanium carbonitride reinforcing particles. The coatings were analyzed by X-ray diffraction (XRD) and energy dispersive spectroscopy (EDAX). The hardness of the coatings was tested by optical micro-hardness tester. The microstructure of the laser cladding layer was investigated by OM and SEM. The results show that Ti (C0.3N0.7) can be synthesized by in-situ reaction. The morphologies of the new granular strengthening phase Ti (C0.3N0.7) are mostly irregular and distributed in the matrix of the cladding . Cladding layer and the base metal to form a good metallurgical bond within the cladding layer for the directional cell dendrites, fine grain. The micro-hardness of the cladding HV0.3 reached 730 ~ 850.