利用6 kW多模横流CO2激光器在45钢表面熔覆了Ni60CuMoW合金粉末,并对熔覆涂层进行了回火处理。通过OM、XRD、SEM、EDS和电化学综合测试系统等手段分析了激光功率和回火复合处理对熔覆层组织和耐蚀性能的影响。结果表明：熔覆层与基体呈良好的冶金结合,熔覆层组织致密。熔覆层主要由富含Ni的基体相γ（Ni,Fe）、固溶体（Ni,Cu）、化合物Ni31Si12、BCr、Cr5 B3、BNi3、FeNi3和M23 C6（M=Cr、Ni、Fe）等组成。随着激光功率的增加,熔覆层与基体间的过渡区域更加平滑。试样耐蚀性随激光功率的降低而增强,腐蚀电位明显正移,腐蚀电流密度降低近2个数量级。对单道涂层试样,回火处理后的耐蚀性好于回火前,而多道熔覆层的耐腐蚀性又优于单道。
Ni60CuMoW alloy coatings were clad on 45 steel substrate by laser cladding using a 6 kW transverse-flow CO2 laser and the samples were then tempered at 600 ℃.The effects of laser power and tempering treatment on microstructure and corrosion resistance of the clad layer were analyzed by optical microscopy（OM）,X-ray diffraction（XRD）,scanning electron microscopy（SEM）,energy dispersive X-ray spectroscopy（EDS） and electrochemical tests.The results show that the cladding layer exhibits dense microstructure and metallurgical bonding is obtained between the coating and substrate.The clad coatings are composed of Ni-rich matrix phase γ（Ni,Fe）,solid solution of Ni and Cu,Ni31Si12,Cr5B3,BCr,BNi3 and M23C6（M=Cr、Ni、Fe）.With the increase of laser power,the transition region between clad layer and substrate becomes smoother.The corrosion resistance of treated samples increases with the laser power decrease.Compared with the substrate,the corrosion potential is positive shift,and the corrosion current density decreases by nearly two orders of magnitude.For single-pass clad specimens,the corrosion resistance is improved after tempering treatment,and the corrosion resistance of the multi-pass clad coatings is better than that of the single-pass clad coatings.
参考文献
| [1] | Cirish R D;Paul C P;Gandhi B K et al.Erosion wear behavior of laser clad surfaces of low carbon austenitic steel[J].Wear,2009,266(9-10):978-987. |
| [2] | LI Fuquan;CHEN Yanbin;LI Li-qun .Microstructures of surface modification layer on Q235 steel produced by laser melt injection of WC[J].Transactions of Nonferrous Metals Society of China,2009,19(03):558-562. |
| [3] | ZHU Xiao-lin,YAO Zheng-jun,GU Xue-dong,CONG Wei,ZHANG Ping-ze.Microstructure and corrosion resistance of Fe-Al intermetallic coating on 45 steel synthesized by double glow plasma surface alloying technology[J].中国有色金属学会会刊（英文版）,2009(01):143-148. |
| [4] | Chang, J.H.;Chang, C.P.;Chou, J.M.;Hsieh, R.I.;Lee, J.L. .Microstructure and bonding behavior on the interface of an induction-melted Ni-based alloy coating and AISI 4140 steel substrate[J].Surface & Coatings Technology,2010(20):3173-3181. |
| [5] | Deng, H.;Shi, H.;Tsuruoka, S. .Influence of coating thickness and temperature on mechanical properties of steel deposited with Co-based alloy hardfacing coating[J].Surface & Coatings Technology,2010(23):3927-3934. |
| [6] | Microstructure evolution of Fe-based WC composite coating prepared by laser induction hybrid rapid cladding[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2010(24):7395-7399. |
| [7] | Manoj Masanta;P. Ganesh;Rakesh Kaul;A.K. Nath;A.Roy Choudhury .Development of a hard nano-structured multi-component ceramic coating bylaser cladding[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2009(1/2):134-140. |
| [8] | Jiang Xu;Chengzhi Zhuo;Dezhong Han;Jie Tao;Linlin Liu;Shuyun Jiang .Erosion-corrosion behavior of nano-particle-reinforced Ni matrix composite alloying layer by duplex surface treatment in aqueous slurry environment[J].Corrosion Science: The Journal on Environmental Degradation of Materials and its Control,2009(5):1055-1068. |
| [9] | 张大伟,张新平.激光熔覆Ni基与Ni+Cr3C2合金涂层凝固组织特征[J].材料热处理学报,2009(02):152-157. |
| [10] | Laser induction hybrid rapid cladding of WC particles reinforced NiCrBSi composite coatings[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2010(14):p.4708. |
| [11] | Viswanathan, A;Sastikumar, D;Kumar, H;Nath, AK .Formation of WC-iron silicide (Fe5Si3) composite clad layer on AISI 316L stainless steel by high power (CO2) laser[J].Surface & Coatings Technology,2009(12):1618-1623. |
| [12] | Yan Hua;Wang Aihua;Xu Kaidong et al.Mierostructure and interfacial evaluation of Co-based alloy coating on copper by pulsed Nd:YAG multilayer laser cladding[J].Journal of Alloys and Compounds,2010,505(02):645-653. |
| [13] | Y. C. Lin;K. Y. Chang .Elucidating the microstructure and wear behavior of tungsten carbide multi-pass cladding on AISI 1050 steel[J].Journal of Materials Processing Technology,2010(2):219-225. |
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