材料科学与工程学报2011，Vol.29Issue(2)：167-172,6.
合金成分对镍基合金激光熔覆涂层组织与性能的影响
Effects of the Alloy Composition on the Microstructure and Properties of Laser Cladding Ni-based Alloy Coatings
摘要
Abstract
In order to study the relationship between the microstructure and properties of the laser cladding Ni-based alloy coatings, Ni25, Ni45, Ni60 alloy coatings were fabricated on the substrate of 45 # steel by laser cladding of the corresponding Ni-based self-fluxing alloy powders at the same process parameters. The microstructure, phase composition and microhardness have been analyzed by the scanning electron microscopy (SEM), X-ray diffractometry (XRD), energy dispersive X-ray spectroscopy (EDS) and microhardness meaurement, respectively. The results show that with increasing alloying element contents, the microstructure of coatings changes from the hypoeutectic to hypereutectic structure, the volume fraction and the size of γ-Ni austenite dendrites and the width of bonding zone between the coating and substrate decrease, but the volume fraction of the interdendritic eutectics and hard phases and the microhardness of the coatings increase from the laser cladding Ni25 to Ni60 alloy coatings. The average microhardness of the laser cladding Ni25, Ni45 alloy coatings are about 250 HV and 550 HV, respectively. However, the average microhardness of the Ni60 alloy coating is about up to 750 HV. It is three times that of the Ni25 alloy coating.关键词
激光熔覆/镍基合金/涂层/结合带/显微硬度Key words
laser cladding/ Ni-based alloy/ coating/ bonding zone/ microhardness分类
矿业与冶金引用本文复制引用
董刚,严彪,邓琦林,余廷..合金成分对镍基合金激光熔覆涂层组织与性能的影响[J].材料科学与工程学报,2011,29(2):167-172,6.基金项目
国家自然科学基金资助项目(50675136,50375096) （50675136,50375096）
