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采用激光增材制造技术,在不同激光扫描速度下制备了FeCrSiAlC合金,分析了合金的显微组织、电化学腐蚀性能与显微硬度分布。结果表明:激光增材制造FeCrSiAlC合金主要由α-Fe、Fe_3Si与FeAl金属间化合物,以及少量M_7C_3型碳化合物组成。随着激光扫描速度的增加,FeCrSiAlC合金的晶粒尺寸差异减小,组织变得更细小,抗电化学腐蚀性能增强,平均显微硬度增加。当激光扫描速度增加到600 mm/min时,FeCrSiAlC合金的抗电化学腐蚀性能最好,平均显微硬度达728 HV0.2。
The laser additive manufacturing technology was used to fabricate FeCrSiAlC alloy at different laser scanning speeds. The microstructure, electrochemical corrosion properties and microhardness distribution of the alloy were analyzed. The results show that the laser additive made of FeCrSiAlC alloy is mainly composed of α-Fe, Fe 3 Si and FeAl intermetallic compounds, and a small amount of M_7C_3 carbon compounds. As the laser scanning speed increases, the grain size difference of FeCrSiAlC alloy decreases, the microstructure becomes finer, the electrochemical corrosion resistance is enhanced, and the average microhardness increases. When the laser scanning speed increased to 600 mm / min, the electrochemical corrosion resistance of FeCrSiAlC alloy was the best, with an average microhardness of 728 HV0.2.