电焊机2026，Vol.56Issue(3)：29-37,9.DOI:10.7512/j.issn.1001-2303.2026.03.04
超高速激光增材铁基复合涂层结构设计与性能研究
Microstructural Design and Performance of Fe-based Composite Coatings Fabricated via Extreme High-Speed Laser Claddings
摘要
Abstract
Critical nuclear power components operating in extreme environments characterized by high temperature,high pressure,and intense irradiation are susceptible to severe wear,necessitating the development of surface strengthening coat-ings with superior wear resistance.Laser additive manufacturing,distinguished by its rapid solidification and controllable heat input,offers an effective pathway for optimizing the microstructure and enhancing the performance of Fe-based com-posite coatings.This study investigates the comparative microstructural evolution and properties of Fe-based composite coat-ings fabricated via Extreme High-Speed Laser Cladding(EHLA)and Broadband Laser Cladding(EH-BLC).The results in-dicate that EH-BLC,benefiting from a more uniform energy distribution and a higher cooling rate,facilitates the formation of planar interlayer interfaces,a narrowed heat-affected zone(HAZ),and a refined equiaxed grain structure.Concurrently,the EH-BLC coating establishes a continuous and dense carbide network,whereas the EHLA coating is characterized by skeletal defects and fragmentation.Attributed to this intact and refined microstructure,the EH-BLC coating demonstrates a low and stable coefficient of friction(COF)along with reduced wear depth.Consequently,the dominant wear mechanism transitions from brittle spalling to mild ploughing and stable plastic flow.Furthermore,the EH-BLC coating exhibits supe-rior electrochemical performance,evidenced by a higher corrosion potential,a lower corrosion current density,and enhanced pitting resistance.Therefore,by constructing a microstructure featuring refined grains and a continuous hard-phase network,the EH-BLC process significantly enhances both wear and corrosion resistance,providing a reliable processing route for the engineering application of high-performance coatings on critical nuclear components.关键词
核电关键部件/激光增材制造/铁基复合涂层/耐磨性能/耐蚀性能Key words
nuclear power key components/laser additive manufacturing/Fe-based composite coating/wear resistance/cor-rosion resistance分类
矿业与冶金引用本文复制引用
温威莹,齐欢,李青宇,廖贞,张亚斌,马赵丹丹..超高速激光增材铁基复合涂层结构设计与性能研究[J].电焊机,2026,56(3):29-37,9.基金项目
中国核动力研究设计院核能增材制造重点实验室开放课题项目(HG2024207) （HG2024207）
