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采用激光熔覆技术在45#钢表面制备NiAlBSi高温合金涂层。利用X射线衍射仪、扫描电镜、电子探针、显微硬度计、摩擦磨损试验机和热重分析仪,对不同激光扫描速度下合金涂层的相组成、微观组织、成分、显微硬度、耐磨性和高温抗氧化性进行了分析。研究结果表明,不同激光扫描速度下合金涂层皆是由树枝状NiAl金属间化合物构成。随着扫描速度的增加,由于树枝晶逐渐细化,合金涂层的硬度增加,但耐磨性能和抗高温氧化性则呈现出先增后降的变化趋势,在激光扫描速度为4 mm/s时,合金涂层具有最好的耐磨性能和抗高温氧化性能。
Preparation of NiAlBSi superalloy coating on 45 # steel by laser cladding. The phase composition, microstructure, composition, microhardness and mechanical properties of the alloy coatings under different laser scanning speeds were characterized by X-ray diffraction, scanning electron microscopy, electron probe, microhardness tester, friction and wear tester and thermogravimetric analyzer. Wear resistance and high temperature oxidation resistance were analyzed. The results show that the alloy coating is composed of dendritic NiAl intermetallics at different laser scanning speeds. With the increase of scanning speed, the hardness of the alloy coating increased due to the dendritic refinement, but the wear resistance and the high temperature oxidation resistance showed the trend of first increasing and then decreasing. At the laser scanning speed of 4 mm / s , Alloy coating has the best wear resistance and high temperature oxidation resistance.