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为了拓展激光熔覆制备高熵合金涂层在材料表面改性中的应用,本文利用激光熔覆的方法在45#钢基体上制备了成形质量良好的CrNiAlCoMoBx系高熵合金涂层,并研究了激光熔覆工艺参数和B含量对涂层成形质量、微观组织结构和硬度的影响。结果表明:在优化的工艺参数下,可以得到表面形貌良好的CrNiAlCoMoBx系高熵合金涂层,涂层与基体呈良好的冶金结合,涂层由枝晶和网状共晶组织组成,均匀致密,最高硬度达到950 HV0.2,平均硬度可达700 HV0.2,是基体45#钢硬度的3倍。随着B含量的增加,裂纹减少,硬度有所降低,但始终在600 HV0.2以上;涂层的干摩擦磨损性能优于H13钢;在3.5%NaCl电解液中耐腐蚀性良好,与304不锈钢相当。
In order to extend the application of high-entropy alloy coating prepared by laser cladding on the surface modification of materials, a high-entropy alloy coating of high quality CrNiAlCoMoBx was prepared on 45 # steel by laser cladding. Effect of Laser Cladding Process Parameters and B Content on Coating Forming Quality, Microstructure and Hardness. The results show that the CrNiAlCoMoBx high-entropy alloy coating with good surface morphology can be obtained under the optimized process parameters. The coating has a good metallurgical bond with the substrate. The coating consists of dendrite and reticular eutectic structure, The highest hardness of 950 HV0.2, with an average hardness of 700 HV0.2, is three times the hardness of 45 # steel. With the increase of B content, the crack decreases and the hardness decreases, but it is always above 600 HV0.2. The dry friction and wear properties of the coating are better than that of H13 steel. The corrosion resistance of the coating is good in 304% Pretty stainless steel.