杨广峰,郜峰,崔静.激光功率对TC4熔覆涂层组织及性能的影响[J].表面技术,2023,52(1):346-353.
YANG Guang-feng,GAO Feng,CUI Jing.Effect of Laser Power on Microstructure and Properties of TC4 Coated Coating[J].Surface Technology,2023,52(1):346-353
激光功率对TC4熔覆涂层组织及性能的影响
Effect of Laser Power on Microstructure and Properties of TC4 Coated Coating
  
DOI:10.16490/j.cnki.issn.1001-3660.2023.01.035
中文关键词:  TC4  超快激光  激光功率  激光熔覆  显微组织
英文关键词:TC4  ultrafast laser  laser power  laser cladding  microstructure
基金项目:国家自然科学基金面上项目(52076212);国家自然科学基金委员会-中国民航局民航联合研究基金(U1933107);中央高校基本科研业务费(ZXH2012D011)
作者单位
杨广峰 中国民航大学 航空工程学院,天津 300300 
郜峰 交通科学与工程学院,天津 300300 
崔静 中国民航大学 航空工程学院,天津 300300 
AuthorInstitution
YANG Guang-feng School of Aviation Engineering,Tianjin 300300, China 
GAO Feng School of Transportation Science and Engineering, Civil Aviation University of China, Tianjin 300300, China 
CUI Jing School of Aviation Engineering,Tianjin 300300, China 
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中文摘要:
      目的 探究超快激光功率对TC4钛合金表面熔覆TC4粉末复合涂层组织及其性能的影响。方法 用超快激光器在TC4基体上制备TC4合金熔覆层。进行了1 000、1 500、2 000 W 3组功率参数的试验,利用扫描电子显微镜、X射线衍射仪、EDS能谱仪、电化学工作站、显微硬度计、摩擦磨损仪,对熔覆层的显微组织、物相结构、耐腐蚀及力学性能进行分析测试。结果 试件的熔覆质量受功率参数的影响,功率较低会导致熔覆层较浅,而功率过高又会导致基体因过烧损坏。3组功率参数下组织分别以细小颗粒胞状晶、细针状树枝晶、粗大树枝晶为主,随着功率的增大,组织开展方向越发规律,同时组织数量和密度都呈下降趋势。激光功率对熔覆层的元素变化影响很小,形成了TiN、Ti2N等硬质相,涂层硬度和抗磨损性能显著增强,硬度最高可达840.5HV。功率为1 000~2 000 W时,磨损性能先增加后降低,功率为1 500 W时抗磨损性能最佳,功率为2 000 W时因功率过高导致抗磨损性能反而比基体更低。同时功率为1 500 W时也具有最高的腐蚀电位和最低的腐蚀电流密度,涂层的耐腐性能最强。结论 合适的扫描功率参数具有最好的熔覆层质量、最佳的硬度和耐蚀耐磨性能。激光功率为1 000~2 000 W时,功率参数P=1 500 W时,熔覆层的综合性能最好。
英文摘要:
      It is an advanced surface modification technology. TC4 composite coating prepared by laser cladding can improve the surface properties without changing the matrix material, such as wear resistance, corrosion resistance, oxidation resistance, microhardness and other properties. The TC4 coated TC4 powder has good compatibility, small parameter differences, and the interface between the substrate and the molten powder is stronger, so the molten powder selects the TC4 powder. In this paper, we study the influence of the power parameters on the organization of the TC4 molten TC4 powder and its performance. The power parameters of the best performance coating are obtained, aiming to provide a reference for the laser power parameters in the aero-engine shell repair work. Use TC4 steel strip as substrate, polish and clean with sand paper. TC4 powder is precoated on clean TC4 steel. Ldm-8060 ultra-fast laser was used in the experiment. The scanning speed was uniformly limited to 100 mm/min, and three sets of power were set:1 000 W, 1 500 W and 2 000 W. Cut the sample with wire cutting and polish the cross section, and corrode it with Kroll solution. Then, observe the microstructure of the cladding layer by metallographic microscope (LEICA MEF4) and a scanning electron microscope (HITACHIS-3400N). Then use an energy spectrometer to perform EDS spectrum analysis on both sides of the bond line. Analyze the phase composition of the coating by an X-ray diffractometer (D/MAX-2500X) and test the microhardness of the cladding layer and matrix by microhardness tester (HVS-1000). The friction test was carried out on MPX-3G pin-disc friction and wear test machine, and the wear weight loss of the specimen was calculated, and the probe wear mark measuring instrument (MP-05) was used to measure the wear weight parameter of wear mark after friction. The composite coating on TC4 steel was successfully prepared by laser cladding technology. The optimal power parameter is 1 500 W. The cladding quality of the specimen is affected by power parameters. Low power will lead to shallower cladding layer, while high power will lead to damage of matrix due to over burning. Under the three power parameters, the tissues were mainly composed of fine granular cellular crystals, fine needle-like dendritic crystals and coarse dendritic crystals, respectively. With the increase of power, the number and density of tissues gradually decreased, and the development direction became more regular. The laser power has little effect on the changes of elements in the cladding layer, and TiN, Ti2N and other hard phases are formed. The hardness and wear resistance of the coating are significantly enhanced, and the hardness is up to 840.5HV. In the power range of 1 000-2 000 W, the wear property increases first and then decreases. Under the power of 1 500 W, the lowest wear is only 0.000 571 g, while under the power of 2 000 W, the wear property is lower than the matrix due to the high power. At the same time, the coating has the highest corrosion potential and the lowest corrosion current density under the power of 1 500 W, and the corrosion resistance is the strongest. To sum up, appropriate scanning power parameters have the best cladding quality, hardness, corrosion resistance and wear resistance.
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