首页|重熔对超高速激光熔覆Fe基涂层组织性能的影响

重熔对超高速激光熔覆Fe基涂层组织性能的影响

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采用中心送粉式超高速激光熔覆方法在Q460钢基体制备Fe基合金涂层,并对涂层进行激光重熔处理,之后利用激光共聚焦(LCSM)、光学显微镜(OM)、扫描电镜(SEM)、X射线衍射仪(XRD)及电化学工作站、显微硬度计、摩擦磨损仪分析重熔前后熔覆层的宏观形貌、微结构及性能.同时,利用COMSOL软件模拟熔覆和重熔过程涂层热场分布.结果表明:中心送粉式超高速激光单次熔覆可成形微米级厚的Fe基涂层,涂层无裂纹、孔洞等缺陷,稀释率仅为6.82％;重熔后的涂层平整度增加且近表面晶粒明显细化,沿生长方向呈梯度结构;重熔样品具有更高的耐腐蚀性,硬度提高约33％,表现出更优的耐磨性;模拟发现,重熔过程中涂层表面的温度梯度明显高于涂层内部,导致涂层梯度结构的形成,涂层表面晶粒细化有利于其表面耐蚀耐磨综合性能的提升.
Effect of remelting on microstructure and properties of extreme high-speed laser cladding Fe-based coating
A Fe-based alloy coating was prepared on Q460 steel substrate using a central powder feeding extreme high-speed laser cladding method,and the coating was laser remelted.Subsequently,the macroscopic morphology,microstructure and properties of the coating before and after remelting were analyzed by means of laser confocal scanning microscopy(LCSM),optical microscope(OM),scanning electron microscopy(SEM),X-ray diffraction(XRD),electrochemical workstation,microhardness tester and friction and wear tester.The COMSOL software was used to simulate the thermal field distribution of the coating during the laser cladding and remelting.The results show that the micron-scale thick Fe-based coating with no defects such as cracks and holes can be formed by single scanning of extreme high-speed laser cladding with central powder feeding system,and the dilution rate is only 6.82％;After remelting,the smoothness of the coating increases and the near surface grains are significantly refined,showing a gradient structure along the growth direction.The remelted samples have higher corrosion resistance,with an increase in hardness of about 33％,exhibiting better wear resistance.The numerical simulation results show that the temperature gradient on the surface of the coating during the remelting is significantly higher than that inside the coating,leading to the formation of the gradient structure of the coating and the refinement of the grain size on the coating surface,which is beneficial for improving its comprehensive corrosion and wear resistance performance.

extreme high-speed laser claddinglaser remeltingmicrostructuregrain refinementcorrosion resistancewear resistance

刘明霞、姚小凤、畅庚榕、代芳

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西安文理学院陕西省表面工程与再制造重点实验室,陕西 西安 710065

西安文理学院西安市植入器械成形与优化重点实验室,陕西西安 710065

西安陕鼓动力股份有限公司,陕西西安 710075

超高速激光熔覆 激光重熔 微观组织 晶粒细化 耐蚀性 耐磨性

国家自然科学基金青年基金项目陕西省自然科学基础研究计划项目陕西省自然科学基础研究计划项目陕西省自然科学基础研究计划项目陕西省自然科学基础研究计划项目西安市科协青年人才托举计划陕西省表面工程与再制造重点实验室开放基金

521010972023KJXX-0682022CGBX-132022JM-2532021JM-5120959202213612022SSER01

2024

10.13289/j.issn.1009-6264.2023-0297

材料热处理学报
中国机械工程学会

材料热处理学报

CSTPCD北大核心
影响因子：0.958
ISSN：1009-6264
年,卷(期)：2024.45(3)
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