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采用激光熔覆技术在QA19-4铝青铜合金表面激光熔覆Fe基合金。采用OM、XRD、显微硬度计对熔覆层的组织、物相和硬度进行分析,测试了铝青铜基体、Fe基激光熔覆层的冲蚀磨损性能。结果表明:激光熔覆层与铝青铜基体形成了冶金结合,无孔洞、夹杂和裂纹等缺陷,熔覆层中主要组织为γ-(Fe-Ni)、CrFe_4、Cu_(3.8)Ni等。熔覆层显微硬度最高为498 HV,平均显微硬度320 HV,是基体硬度的2倍;随冲蚀时间的延长,熔覆层失重量比QA19-4铝青铜基体的失重量要低得多,熔覆层的耐磨性比基体组织的耐磨性提高了近2倍,激光熔覆层的冲蚀耐磨性能得到明显提高。
Laser Cladding Fe-based Alloy on QA19-4 Aluminum Bronze Alloy by Laser Cladding. The microstructure, phase and hardness of the coating were analyzed by OM, XRD and microhardness tester. The erosion and wear properties of the aluminum bronze substrate and the Fe-based laser cladding layer were tested. The results show that the laser cladding layer forms a metallurgical bond with the aluminum bronze matrix without any defects such as voids, inclusions and cracks. The main microstructure of the cladding layer is γ-Fe, CrFe_4 and Cu_3.8 Ni. The highest microhardness of the coating is 498 HV and the average microhardness is 320 HV, which is twice that of the substrate. With the extension of the erosion time, the weight loss of the coating is lower than the weight loss of the QA19-4 aluminum bronze matrix The abrasion resistance of the cladding layer is almost 2 times higher than the wear resistance of the matrix structure, and the abrasion resistance of the laser cladding layer is obviously improved.