表面技术2025，Vol.54Issue(3)：130-141,12.DOI:10.16490/j.cnki.issn.1001-3660.2025.03.011
扫描速度对Inconel 625涂层耐磨耐蚀性能的影响
Effect of Scanning Speed on Wear and Corrosion Resistance of Inconel 625 Coatings
摘要
Abstract
H13 steel(4Cr5MoSiV1)is a kind of widely used hot work tool steel.During operation,the tool steel is subject to prolonged high-temperature oxidation,high-intensity alternating stress,and thermal shock,which significantly shorten its effective service life.To enhance the wear and corrosion resistance of the H13 hot work tool steel surface and thereby extend its service life,this study employs laser cladding technology to prepare four sets of Inconel 625 coating samples on the H13 steel surface at scanning speed of 8 mm/s,10 mm/s,12 mm/s,and 14 mm/s,respectively.The research investigates the effect of scanning speed on the wear and corrosion resistance properties of the Inconel 625 coating. The microstructure and elemental distribution of the coatings were observed and analyzed with a scanning electron microscope(Zeiss Supra 55 V)which was equipped with an energy dispersive spectrometer(EDS).The phase composition of the coatings was measured and analyzed with a Bruker D8 ADVANCE X-ray diffractometer.Specific parameters for the X-ray diffractometer were:Cu target,scanning range 2θ(5°-90°),scanning speed 10°/min,operating current 30 mA,and acceleration voltage 40 kV.The microhardness of the coatings was measured with an HV-1000 A microhardness tester with the following settings:load 1.96 N load duration 10 s;measurement interval 0.1 mm;The average value of three measurements at the same level was taken as the experimental result.The friction coefficient of the coatings was tested with a reciprocating MFT-5000 Rtec wear tester,with a reciprocating speed of 0.02 m/s,wear time of 20 min,and a counter body of a Si3N4 ball with a diameter of 9 mm and a hardness value of 1 400HV-1 700HV.Electrochemical corrosion tests on the coatings were conducted at room temperature and atmospheric pressure with an electrochemical workstation(CHI760E).The working electrode(WE)was the specimen,the auxiliary electrode(CE)was platinum(Pt),and the reference electrode was a saturated calomel electrode(SCE),with the electrolyte solution being 3.5％NaCl solution. After the preparation of the Inconel 625 coating on the surface of H13 steel,the corrosion resistance and other mechanical properties of the coating were enhanced,and the morphology of the coating was affected by the laser scanning speed,with the increase of the laser scanning speed,the flatness tended to be flat,and the metallic luster was gradually enhanced.When the scanning speed for cladding was different,it did not change the type of physical phase of the cladding coatings.The main phases of the coating were γ-(Fe,Ni),Fe-Ni-Cr,FeNi3,Cr7Ni3,etc.The microstructures of the coating were dendritic crystals.Cr,Mo,Nb,Fe,N,Si,C and other elements were evenly distributed,and there was no significant segregation of a single element.When the laser scanning speed was 14 mm/s,the H4 coating achieved the maximum average microhardness of 496.51HV0.2.When the scanning speed was 12 mm/s,the wear amount was the lowest,which was only 25％of the wear amount of the substrate,and the wear resistance of each specimen was ranked as H3＞H4＞H2＞H1＞Substrate.With the increase of scanning speed,the self-corrosion current density(J corr)of the coatings showed a tendency of first decrease and then increase,and the self-corrosion potential(E corr)increased and then decreased.The H2 coating had the most positive self-corrosion corrosion potential of-0.503 9 V,and the H3 coating had the smallest self-corrosion current density of 3.698 2×10-5 A/cm2.The corrosion resistance of each specimen was ranked as H3＞H4＞H2＞H1＞Substrate.In four groups of Inconel 625 coatings prepared using laser cladding technology on H13 steel,the coatings show excellent corrosion resistance and other mechanical properties when other process parameters are kept constant and the laser scanning speed is 12 mm/s.关键词
激光熔覆/Inconel 625/扫描速度/耐磨耐蚀Key words
laser cladding/Inconel 625/scanning speed/wear and corrosion resistance分类
矿业与冶金引用本文复制引用
邹利,孙文磊,张团,卢裕尔,黎勇,钟荟玄..扫描速度对Inconel 625涂层耐磨耐蚀性能的影响[J].表面技术,2025,54(3):130-141,12.基金项目
新疆维吾尔自治区重点研究项目(2022B01036) Key Research Project of Xinjiang Autonomous Region(2022B01036) （2022B01036）
