HK40耐热钢热浸镀Al工艺

Hot-dipped Aluminizing on the HK40 Heat-resistant Steel

研究了在浸镀Al液中加入Si和稀土对HK40耐热钢热浸镀Al层的影响。应用光学显微镜、扫描电镜等分析了镀层的微观组织和成分分布,应用X射线衍射仪分析了镀层的相结构,并对基体到镀层的不同区域进行了显微硬度测试。结果表明,Si和稀土的加入,使镀层变薄,表面更光滑,镀层和基体的结合更好,镀层组织中出现了较多的FeAl3和Fe2Al5相,大大提高了过渡层的显微硬度。

Effects of Si and RE on the hot-dip aluminizing HK40 heat-resistant steel were investigated. By means of optical microscope, scanning electron microscope and energy spectrum analysis, the microstructure and element distribution of coating were analyzed. The phase constitute of coating was investigated by X-ray diffraction, and the hardness testing was carried out at different zone from steel base to coating. The results show that the surface thickness of coating is decreased and exhibits more smoothly, meanwhile, the coating and the matrix are characterized by metallurgical bonding with the addition of Si and RE. More FeAl3 and Fe2Al5 phases appear in coating, and the micro-hardness of transient layer is improved largely.