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Hybrid forming mechanism of patternless casting and laser cladding

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Frontiers of Mechanical Engineering 2019年第4期14卷 393-401页

作者： Zhongde SHAN Fuzhen SUN Yang LIU China Academy of Machinery Science and Technology Beijing 100044China State Key Laboratory of Advanced Forming Technology&Equipment Beijing 100083China

In accordance with the requirement of manufacturing dies quickly and economically,a hybrid forming method of stamping dies for automobile panels is *** method combines digital patternless casting and high-power laser *** experimental study is conducted on the hybrid forming process and its trial production and application in the manufacturing of stamping dies for typical *** prove that the laser cladding layer exceeds HRC60(Rockwell hardness)and thus meets the production efficiency requirement of automobile *** rate of defects is well *** with traditional technology,this technology has remarkable advantages and advancement.

关键词： patternless casting laser cladding hybrid forming rapid tooling

NUMERICAL ANALYSIS OF HEAT TRANSFER DURING laser cladding TO SYNTHESIZE TiCp/Al COMPOSITE

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Acta Metallurgica Sinica(English Letters) 2004年第1期17卷 1-6页

作者： D.N.Zou J.Yang Y.L.Huang J.Y.Su School of Metallurgical Engineering Xi'an University of Architecture and Technology Xi'an 710055ChinaSchool of Metallurgical EngineeringXi'an University of Architecture and Technology Xi'an 710055ChinaSchool of Materials Science and Engineering Xi'an Jiaotong University Xi'an 710049 ChinaSchool of Materials Science and Engineering Xi'an Jiaotong University Xi'an 710049 China

Based on the continuum model for binary solid-liquid phase change system, the math-ematic model to simulate the process of laser cladding in situ synthesis TiCp/Al composite on the surface of aluminum alloy was formulated. The additive source method was employed to treat with the heat release of synthetic reaction in powder mixture at certain temperatures, and also to solve the momentum and heat transfer caused by the relative movement between laser beam and the specimen. Two different types of driving forces for flow were considered in the model, i.e., the buoyancy force and the surface tension gradient at the laser pool surface. The three-dimensional transient temperature field simulation program was developed being based upon the commercial software PHOENICS. The calculated and observed fusion boundaries were compared and very good agreement was obtained.

关键词： numerical simulation heat transfer laser cladding in situ synthesis composite

Formation and properties of a Zr-based amorphous coating by laser cladding

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Rare Metals 2024年第4期43卷 1809-1814页

作者： Ning Zhang Ying Liu Wei Yang Shu-Jie Pang Key Laboratory of Aerospace Materials and Performance(Ministry of Education) School of Materials Science and EngineeringBeihang UniversityBeijing100191China

(Zr_(0.53)Al_(0.1)Ni_(0.05)Cu_(0.3)Ti_(0.02))_(99)Y_1(at%)coating with amorphous layer of about 180μm thick was prepared on a steel substrate by using laser cladding *** coating is compact and shows good metallurgical bonding with *** microstructure,microhardness and corrosion behavior along the depth from the coating surface to the substrate were *** is found that a gradient structure consisted of amorphous surface layer,amorphous-crystalline transitional layer and substrate is formed after the laser *** microhardness and corrosion behavior exhibit variation with the microstructural evolution at different depths from the coating *** microhardness and corrosion resistance in 3.5 wt%NaCl solution of the amorphous surface layer are comparable to those of the as-cast Zr-based BMG with the same composition,and higher than those of the steel substrate.

关键词： laser cladding Amorphous coating Microstructure Hardness Corrosion resistance

Ti-based composite coatings with gradient TiC_x reinforcements on TC4 titanium alloy prepared by laser cladding

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Science China(Technological Sciences) 2014年第7期57卷 1454-1461页

作者： LIU ShuNv LIU ZongDe WANG Yang YUE Peng Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education North China Electric Power University

TiCx-NiTi2/Ti cermet composite coatings C1 and C2 with gradient TiCx reinforcements were prepared on TC4 titanium alloy by laser cladding *** microstructure and phase compositions were analyzed by means of scanning electron microscopy(SEM),energy-dispersive spectroscopy(EDS)and X-ray diffraction(XRD)*** TiCx exhibited a dendritic microstructure,and homogeneously dispersed in the Ti-based matrix where NiTi2 was *** increasing ingredient supercooling,temperature gradient and cooling temperature,the dendrites displayed a finer morphology with longer primary trunks and intensified side branches in the dilution *** the smoothed,coarse columnar ones became dominant in the upper clad layer due to the repeated energy input during multi-track *** Vickers microhardness presented a linear change trend through the cross-sections,which well confirmed the gradient distribution of *** more TiCx,C1 presented higher hardness than C2.

关键词： laser cladding composite coating TiCx-NiTi2 titanium alloy microhardness

Microstructure and corrosion properties of laser cladding MoNi based alloy coatings

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Science China(Technological Sciences) 2014年第5期57卷 980-989页

作者： LI XinZhi LIU ZongDe WANG YongTian Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education North China Electric Power University

Mo-based alloys are widely used for their excellent wear and corrosion resistance as well as high temperature ***-NiCrBSi and Mo-Ni alloy coatings were prepared on 1020 water wall tube by laser cladding technology in the present *** microstructure and phase compositions were analyzed by means of the scanning electron microscopy(SEM),energy-dispersive spectroscopy(EDS)and X-ray diffractometry(XRD).The corrosion properties of the coatings were evaluated by an electrochemical experiment at room temperature in 3.5 wt.%NaCl *** increasing content of Mo,the structure homogeneity in Mo-Ni coatings deteriorated,the grain size increased,the average hardness and the corrosion resistance declined,due to the more content of harmful *** to the Mo-Ni coatings,the overall performance was better for the Mo-NiCrBSi,which had the higher hardness contributed by the element B and Si as well as the better corrosion resistance due to the addition of Cr.

关键词： laser cladding Mo-Ni Mo-NiCrBSi corrosion resistance

Surface hardening of Fe-based alloy powders by Nd:YAG laser cladding followed by electrospark deposition with WC-Co cemented carbide

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Rare Metals 2010年第4期29卷 380-384页

作者： WANG Jiansheng,MENG Huimin,YU Hongying,FAN Zishuan,and SUN Dongbai School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China School of Materials Science and Engineering University of Science and Technology Beijing Beijing China

This paper presents the results of a study concerned with the surface hardening of Fe-based alloys and WC-8Co cemented carbide by inte- grating laser cladding and the electrospark deposition processes. Specimens of low carbon steel were processed firstly by laser cladding with Fe-based alloy powders and then by electrospark deposition with WC-SCo cemented carbide. It is shown that, for these two treatments, the electrospark coating possesses finer microstructure than the laser coating, and the thickness and surface hardness of the electrospark coating can be substantially increased.

关键词： laser cladding electrospark deposition surface hardening Fe-based alloy cemented carbide

Wear and corrosion resistance of CoCrNi composite coatings by laser cladding

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China Foundry 2022年第6期19卷 535-543页

作者： Di Jiang Hong-zhi Cui Xiao-jie Song Xiao-juan Lian Xiao-feng Zhao Hao Chen Guo-liang Ma School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China School of Materials Science and Engineering Ocean University of ChinaQingdao 266100China

Two kinds of CoCrNi composite coatings,CoCrNiMo and CoCrNiMoBC,were prepared by laser cladding on the base metal of 304 stainless *** wear and corrosion properties of the coatings were studied by wear tests and electrochemical *** show that the addition of B_(4)C promotes the generation of the ceramic phase,and therefore improving the microhardness of the coating and enhancing its wear resistance,while simutaneously keeps its excellent corrosion *** dispersive X-ray spectrometry analysis shows that the chromium distribution in the two coatings is relatively uniform,which is beneficial for corrosion *** Kelvin probe microscopy results reveal that the potential difference between dendrites and interdendrites is only 20 mV,which leads to a relatively low driving force for galvanic *** through the atomic-scale high-resolution transmission electron microscopy shows that the fundamental reason for the high wear and corrosion resistance of the coating is the excellent coherent interface between the two phases,which reduces the interface energy and potential difference and thus improving its corrosion resistance.

关键词： wear corrosion laser cladding coherent boundary 304 stainless steel

A COMPREHENSIVE MODEL OF laser cladding BY POWDER FEEDING

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Acta Metallurgica Sinica(English Letters) 2004年第1期17卷 21-27页

作者： Y.L.Huang G.Y.Liang J.Y.Su School of Materials Science and Engineering Xi'an Jiaotong University Xi'an 710049 ChinaSchool of Materials Science and Engineering Xi'an Jiaotong University Xi'an 710049 ChinaSchool of Materials Science and Engineering Xi'an Jiaotong University Xi'an 710049 China

A novel model was presented to predict the evolutionary development of cladding layer, and a method based on Lambert-Beer theorem and Mie's theory was adopted to treat the interaction between powder stream and laser beam. By using the continuum model and enthalpy-porosity method, the fluid flow and heat transfer in solid-liquid phase change system were simulated. The commercial software PHOENICS, to which several modules were appended, was used to accomplish the simulation. Numerical computation was performed for Stellite 6 cladding on steel, the obtained results are coincident with those measured in experiment basically.

关键词： laser cladding powder feeding cladding layer interaction

Microstructure and wear resistance of AlCrFeNiMo_(0.5)Si_(x) high-entropy alloy coatings prepared by laser cladding

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China Foundry 2022年第6期19卷 473-480页

作者： Xiao-cong Li Hui Liang Yan-zhou Zhao Li Gao Li Jiang Zhi-qiang Cao Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024LiaoningChina School of Physics and Electronic Technology Liaoning Normal UniversityDalian 116029LiaoningChina

In recent years,the coating prepared by laser cladding has attracted much attention in the field of wear *** this work,AlCrFeNiMo_(0.5)Si_(x)(x=0,0.5,1.0,1.5,2.0)high-entropy alloy coatings were designed and prepared on Q235 steel by laser *** effect of Si content on microstructure,microhardness and wear resistance of the coatings was studied in *** results indicate that the AlCrFeNiMo_(0.5)Si_(x) highentropy alloy coatings show an excellent bonding between substrate and the cladding *** AlCrFeNiMo_(0.5)Si_(x) coatings are composed of nano-precipitated phase with BCC structure and matrix with ordered B2 *** the addition of Si,the white phase(Cr,Mo)_(3)Si with cubic structure appears in the interdendritic,and the morphology of the coating(x=2.0)transforms into lamellar eutectic-like *** addition of Si enhances the microhardness and significantly improves the wear resistance of the *** x increases from 0 to 2.0,the average hardness of the cladding zone increases from 632 HV to 835 HV,and the wear rate decreases from 1.64×10^(-5) mm^(3)·(N·m)^(-1) to 5.13×10^(-6) mm^(3)·(N·m)^(-1).When x≥1.5,the decreasing trend of the wear rate gradually slows *** wear rates of Si1.5 and Si2.0 coatings are 5.85×10^(-6) mm^(3)·(N·m)^(-1) and 5.13×10^(-6) mm^(3)·(N·m)^(-1),respectively,which is an order of magnitude lower than that of Q235 steel.

关键词： high-entropy alloy coatings laser cladding microstructure wear resistance