摘要
采用激光熔覆技术在Q235钢表面制备Fe-Al复合涂层和Fe-Al-Si复合涂层。利用X射线衍射仪和扫描电镜等方法分别研究两种涂层的物相和微观组织,并测试其显微硬度和耐磨性,同时进行对比分析。结果表明:Fe-Al复合涂层主要由Fe、Al、Al2O3、Fe3Al等相组成,而Fe-Al-Si复合涂层主要由Fe、SiO2以及Al2Fe3Si4等相组成;Fe-Al复合涂层内部存在孔隙缺陷,而Fe-Al-Si复合涂层内部无裂纹、气孔等,组织更均匀细小,与基体之间冶金结合良好;Fe-Al-Si复合涂层的显微硬度和耐磨性均约为Fe-Al复合涂层的1.8倍。
Fe-A1 composite coating and Fe-A1-Si composite coating were prepared on the surface of Q235 steel by laser cladding. The phase and microstructure of the two coatings were investigated by XRD and SEM. The microhardness and wear resistance were tested, then the comparisons were made about them. The results show that Fe-A1 composite coating consists mainly of Fe, A1, A1203 and Fe3A1, and there are Fe, SiO2 and A12Fe3Si4 in Fe-A1-Si composite coating. The microstructure of Fe-A1-Si composite coating has a good metallurgical bond between the coating and substrate, there are flee of crack and porosity and more fine, while there are porosities in Fe-A1 composite coating. The microhardness and wear resistance of Fe-A1-Si composite coating are higher than that of Fe-A1 composite coating, increased by 1.8 times.
出处
《热加工工艺》
CSCD
北大核心
2012年第24期162-164,167,共4页
Hot Working Technology
基金
国家自然科学基金资助项目(51001047
51165008)
江西省自然科学基金资助项目(2009GQC0014)
江西省教育厅项目(GJJ11094)
关键词
激光熔覆
复合涂层
微观组织
显微硬度
耐磨性
laser cladding
composite coating
microstructure
microhardness
wear resistance
