粉末冶金技术2025，Vol.43Issue(4)：423-431,443,10.DOI:10.19591/j.cnki.cn11-1974/tf.2025030022
304不锈钢表面激光熔覆Ni625/TC4涂层的微观组织与性能
Microstructure and properties of Ni625/TC4 coatings on 304 stainless steels by laser cladding
张新奥 1梁腾文 1满成 1崔洪芝1
作者信息
- 1. 中国海洋大学材料科学与工程学院,青岛 266100
- 折叠
摘要
Abstract
To enhance the corrosion and wear resistance of the 304 stainless steel components,the metallic coatings with varying Ni625/TC4 mass ratios(3:1,5:1,7:1,and 9:1)were fabricated on 304 stainless steel substrate by laser cladding technology,using Ni625 and TC4 powders as raw materials.The microstructural morphology and phase composition of the coatings were characterized by scanning electron microscopy(SEM)and X-ray diffraction(XRD).The corrosion behavior and wear mechanisms were investigated through electrochemical testing and wear experiments,respectively.The results demonstrate that all four laser cladding coatings consist of body-centered cubic(BCC)Fe3Ni2,hexagonal-structured TiFe2,and Ni3Ti intermetallic phases.The contents of TiFe2 and Ni3Ti phases progressively decrease with Ni625 content increasing.The coatings with Ni625/TC4 ratio of 3:1 exhibit the optimal wear resistance,dominated by abrasive wear mechanisms.As the Ni625 content increases,the wear mechanism transitions to the oxidative wear.All coatings display the exceptional passivation behavior in artificial seawater solution,with the passivation current density progressively decreasing as the Ni625 content increases.The coatings with Ni625/TC4 ratio of 9:1 demonstrate the most superior corrosion resistance.关键词
不锈钢/激光熔覆/Ni625/TC4涂层/摩擦/磨损/耐蚀性Key words
stainless steels/laser cladding/Ni625/TC4 coatings/friction/wear/corrosion resistance分类
矿业与冶金引用本文复制引用
张新奥,梁腾文,满成,崔洪芝..304不锈钢表面激光熔覆Ni625/TC4涂层的微观组织与性能[J].粉末冶金技术,2025,43(4):423-431,443,10.
