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Anomalous microstructure and tribological evaluation of AlCrFeNiW_(0.2)Ti_(0.5)high-entropy alloy coating manufactured by laser cladding in seawater

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Journal of Materials Science & Technology 2021年第26期85卷 224-234页

作者： Hui Liang Dongxu Qiao Junwei Miao Zhiqiang Cao Hui Jiang Tongmin Wang Materials Science and Engineering Dalian University of TechnologyDalian116024China New Materials Innovation Center Ningbo Institute of Dalian University of TechnologyNingbo315000China College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao266590China

To evaluate the potential of high entropy alloys for marine applications,a new high entropy alloy coating of AlCrFeNiW_(0.2)Ti_(0.5)was designed and produced on Q235 steel via laser *** microstructure,microhardness and tribological performances sliding against YG6 cemented carbide,GCr15 steel and Si_(3)N_(4)ceramic in seawater were studied in *** AlCrFeNiW_(0.2)Ti_(0.5)coating showed an anomalous’sunflower-like’morphology and consisted of BCC and ordered B2 *** microhardness was approximately 692.5 HV,which was 5 times higher than *** coating showed more excellent tribological performances than Q235 steel and SUS304,a typical material used in seawater environment,sliding against all three coupled balls in ***,the wear and friction of AlCrFeNiW_(0.2)Ti_(0.5)coating sliding against YG6 in seawater were most *** main reason was the generation of Mg(OH)_(2),CaCO_(3),metal oxides and hydroxides and the formation of protective tribo-film on the worn surface of AlCrFeNiW_(0.2)Ti_(0.5)coating in the process of reciprocated *** would effectively hinder the direct contact between the worn surfaces of AlCrFeNiW_(0.2)Ti_(0.5)coating and YG6 ball,resulting in a decrease of friction coefficient and wear *** the YG6 was an ideal coupled material for AlCrFeNiW_(0.2)Ti_(0.5)coating in seawater,and the coating would become a promising wear-resisting material in ocean environment.

关键词： High-entropy alloy coating laser cladding Microstructure Microhardness Tribological properties

Effect of Y_(2)O_(3) on microstructure and properties of CoCrFeNiTiNb high entropy alloy coating on Ti-6Al-4V surface by laser cladding

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Journal of Rare Earths 2024年第3期42卷 586-599,I0006页

作者： Zhen Li Wei Zhao Kedong Yu Ning Guo Guangchun Xiao Zhiming Wang Hui Zhang College of Mechanical Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan250353China Shandong Institute of Mechanical Design and Research Jinan250031China

The effects of Y_(2)O_(3) on the microstructure, microhardness, wear resistance, high-temperature oxidation resistance, hot corrosion resistance, and electrochemical corrosion behaviour of CoCrFeNiTiNb high entropy alloy coatings formed on Ti-6Al-4V alloy surfaces were studied. The results show that the addition of Y_(2)O_(3) changes the proportion of the phase but does not change its type. The average grain size is only 1/4.7 of that of the high entropy alloy(HEA) coating, and the fine-grained strengthening leads to increases in the microhardness and wear resistance of 21.8% and 26.9%, respectively. The addition of Y_(2)O_(3) enhances the denseness and bonding properties of the oxide and corrosion product layers, reducing the oxidation and hot corrosion rates by 60.3% and 40.3%, respectively. The addition of Y_(2)O_(3) doubles the corrosion resistance which is attributed to the refinement of the grains, the increased proportion of HCP and TiN, and the weakening of galvanic coupling corrosion.

关键词： laser cladding High entropy alloy coatings Rare earths Wear properties High temperature properties Electrochemical corrosion

Study of Cracking Mechanism and Wear Resistance in laser cladding Coating of Ni-based Alloy

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Chinese Journal of Mechanical Engineering 2021年第5期34卷 259-272页

作者： Zhenglei Yu Lunxiang Li Deqiang Zhang Guangfeng Shi Guang Yang Zezhou Xu Zhihui Zhang Key Lab of Bionic Engineering Ministry of EducationJilin UniversityChangchun 130022China State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130022China College of Mechanical and Electric Engineering Changchun University of Science and TechnologyChangchun 130022China College of Mechanical Engineering and Automation Liaoning University of TechnologyJinzhou 121001China Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process Shenyang Aerospace UniversityShenyang 110136China

Nickel-based alloy coatings were widely used for the remanufacturing of dies and moulds by laser cladding,but the crack sensitivity would be increase due to the higher strength and hardness,which reduced the wear resistance of Ni-based *** this paper,Ni-based coatings with the addition of a plastic phase(an austenitic stainless net)were prepared using laser cladding technology,and the CeO_(2)was added in cladding *** cracking mechanism,microhardness,microstructure,phase composition,and wear properties were *** relationship between thermal stress and the elastic and plastic fracture had been developed from the standpoint of fracture mechan-ics and thermal elastic fracture *** fracture criterion of the nickel-based coating was obtained,and the study has shown that the crack sensitivity could be reduced by decreasing the thermal expansion coefficientΔα.Thus,a new method was proposed,which the stainless steel nets were prefabricated on the *** was found that the number of cracks reduced significantly with the addition of stainless steel *** the stainless steel net with 14 mesh was added in Ni-based coatings,the average microhardness of nickel composite coating was 565 HV_(0.2),which was 2.6 times higher than that of the 45 steel *** the rare earth oxide 4 wt.%CeO_(2)and stainless steel net were added in the Ni-based coating reducing the microhardness(the average microhardness is 425 HV_(0.2)),the wear resistance of it improved *** wear volume of Ni-based composite coating was 0.56×10^(−5) mm^(3)·N^(−1)·m^(−1),which was 85.1%lower than that of 45 *** experiment results have shown that the Nickel-based composite coating is equipped with low crack sensitivity and high abrasive resistance with austenitic stainless net and the rare earth oxide 4 wt.%*** research offers an efficient solution to produce components with low crack susceptibility and high wear-resistance coatings fabricated

关键词： laser cladding Wear resistance Crack sensitivity Stainless steel net Rare earth oxide

Corrosion Resistance and Tribological Properties of laser cladding Layer of H13 Die Steel Strengthened by Ultrasonic Rolling

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Chinese Journal of Mechanical Engineering 2022年第6期35卷 415-426页

作者： Kaikui Zheng Youxi Lin Jianguo Cai Chengqian Lei School of Mechanical Engineering and Automation Fuzhou UniversityFuzhou 350116China School of Advanced Manufacturing Fuzhou UniversityJinjiang 362251China Mechanical and Electrical Engineering Practice Center Fuzhou UniversityFuzhou 350116China

laser cladding is a new surface repair method that can improve the wear and corrosion resistance of substrate ***,the cladding layer typically exhibits a rough surface,high hardness and large residual tensile stress,and thus requires further machining and *** rolling(U-rolling)is a highly efficient finishing and strengthening process that combines ultrasonic technology with traditional rolling(T-rolling).In this study,an ironbased alloy was coated onto the surface of H13 die steel using laser cladding,and the surface of the cladding layer was polished using *** effects of U-rolling on the surface quality,corrosion resistance and friction and wear properties of the laser-cladding layer were investigated and compared with those obtained by *** surface roughness of the U-rolled sample was only 1/4 that of the T-rolled *** hardness and residual compressive stress of the laser cladding layer after U-rolling were higher than those after ***,the surface corrosion resistance of the laser cladding layer after U-rolling was higher than that after T-rolling.U-rolling changed the surface roughness,grain size,and residual stress of the material and thus affected the corrosion resistance of the laser cladding *** friction coefficient and wear rate of the U-rolled surface of the cladding layer were lower than those of the T-rolled *** addition,the tribological properties of the cladding layer were found to be related to the rolling *** the friction direction of the sample was the same as the rolling direction,its friction and wear performance were higher than those when the two directions were perpendicular.

关键词： laser cladding Ultrasonic rolling Surface quality Corrosion resistance Tribological properties

Effects of CeO_2 on microstructure and corrosion resistance of TiC-VC reinforced Fe-based laser cladding layers

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Journal of Rare Earths 2014年第11期32卷 1095-1100页

作者：张辉邹勇邹增大史传伟 Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University

The effects of CeO2 on microstructure and corrosion resistance of TiC-VC reinforced Fe-based laser cladding layers were investigated. The results showed that carbides presented in cladding layers were TiVC2 and VC. A small quantity of CeC appeared with 2.0 wt.% CeO2 addition. The amount of lamellar pearlite increased while the amount of residual austenite decreased with increasing CeO2 addition. The corrosion resistance of cladding layers increased firstly and then decreased with the addition of CeO2 increasing. The EIS spectrum of the cladding layer without CeO2 was composed of an inductive arc at low frequency and a capacitive arc at high frequency. The cladding layer with 0.5 wt.% CeO2 addition showed the best corrosion resistance, and then the inductive arc at low frequency transformed into a capacitive arc.

关键词： laser cladding rare earths CeO2 corrosion resistance electrochemical impedance spectroscopy

3-D transient numerical simulation on the process of laser cladding by powder feeding

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Journal of University of Science and Technology Beijing 2004年第1期11卷 13-17页

作者： YanluHuang GongyingLiang JunyiSu SchoolofMaterialsScienceandEngineering Xi＇anJiaotongUniversityXi＇an710049China

A 3-D transient mathematical model for laser cladding by powder feeding wasdeveloped to examine the macroscopic heat and momentum transport during the process, based on whicha novel method for determining the configuration and thickness of cladding layer was presented. Byusing Lambert-Beer theorem and Mie's theory, the interaction between powder stream and laser beamwas treated to evoke their subtle effects on heat transfer and fluid flow in laser molten pool. Thenumerical study was performed in a co-ordinate system moving with the laser at a constant scanningspeed. A fixed grid enthalpy-porosity approach was used, which predicted the evolutionarydevelopment of the laser molten pool. The commercial software PHOENICS, to which several moduleswere appended, was used to accomplish the simulation. The results obtained by the simulation werecoincident with those measured in experiment basically.

关键词： powder feeding laser cladding numerical simulation cladding track heattransfer

In-situ TiC Reinforced Composite Coating Produced by Powder Feeding laser cladding

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Journal of Materials Science & Technology 2006年第4期22卷 519-525页

作者： Sen YANG Wenjin LIU Minlin ZHONG Department of Materials Science and Engineering Inner Mongolia University of Technology Hohhot 010062 China Department of Mechanical Engineering Tsinghua University Beijing 100084 China

A Ni-base alloy composite coating reinforced with TiC particles of various shapes and sizes on medium carbon steel substrate was produced by multilayer laser cladding. The chemical compositions, microstructures and surface morphology of the cladded layer were analyzed using energy dispersive X-ray spectroscopy （EDX）, scanning electron microscope （SEM）, and X-ray diffractometry （XRD）. The experimental results showed that an excellent metallurgical bonding between the coating and the substrate was obtained. The microstructure of the coating was mainly composed of γ-Ni dendrites, a small amount of CrB, Ni3B, M23C6 and dispersed TiC particles. Much more and larger TiC particles formed in the overlapping zone, which led to a slightly higher microhardness of this zone. The maximum microhardness of the coating was about HV0.21200. The effects of the laser processing parameters on the microstructures and properties of coating were also investigated.

关键词： laser cladding In-situ synthesized Powder feeding TiC particle

Wear resistance and hot corrosion behaviour of laser cladding Co-based alloy

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Transactions of Nonferrous Metals Society of China 2001年第6期11卷 838-842页

作者：张松张春华吴维 文効忠王茂才 Shenyang Polytech Univ Sch Mat Sci & Engn Shenyang 110023 Peoples R China Chinese Acad Sci State Key Lab Corros & Protect Met Shenyang 110016 Peoples R China Hong Kong Polytech Univ Dept Mfg Engn Hong Kong Hong Kong Peoples R China

Cr13 stainless steel was surface cladded with Co based alloy using a high power carbon dioxide laser. The microstructure, wear resistance and corrosion properties of the clad layer were investigated. It is found that the high temperature corrosion behavior and wearing resistant property of the clad layer are 3 and 2.5 times higher than those of the parent metal. Under the high temperature molten lead sulphate salt corrosion condition, the clad layer fails by spalling which is caused by intergrannular corrosion within the clad layer. The fine dendritic structure and the oxide help to retard the penetration of the sulphur ion that induces the intergrannular corrosion.

关键词： laser cladding Co based alloy wear resistance hot corrosion

Investigation on laser cladding of MoSi_2 powder on steel

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Journal of University of Science and Technology Beijing 2005年第5期12卷 436-439页

作者： Laiqi Zhang Guangnan Chen Zuqing Sun State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China Institute of Mechanics Chinese Academy of Sciences Beijing 100080 China

The feasibility of the fabrication of coatings for elevated-temperature structural applications by laser cladding MoSi2 pow- der on steel was investigated. A dense and crack-free fine coating, well-bonded with the substrate has been obtained by this technique This coating consists of FeMoSi, Fe2Si and a small amount of MosSi3 due to dilution of the substrate in the coating. The microstructure of the coating is characterized of typical fine dendrites, The dendrites are composed of FeMoSi primary phase, and the interdendritic areas are two eutectic phases of FeMoSi and Fe2Si. The hardness of the coating reaches 845 Hv0.5, 3.7 times larger than that of the steel substrate （180 Hv05）.

关键词： laser cladding molybdenum silicide powder coating microstructure