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Advanced Surface Engineering Technologies for Remanufacturing Forming

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稀有金属材料与工程 2012年第S1期41卷 1-5页

作者： Xu Binshi wang haidou Ma Guozheng Acad Armored Forces Engn Natl Key Lab Remfg Beijing 100072 Peoples R China

Based on the foreign remanufacturing mode,which relies mainly on Part-Replacing Repair Method and Size-Changing Repair Method,China has explored and practiced the new remanufacturing mode,which relies mainly on Surface Repair and Performance Improving *** aim of remanufacturing forming is to renew rapidly the original size of the waste components rapidly,and then improve their service *** advanced surface engineering technology,especially the high density heat source surface forming technology,is the important technique to carry out rapid *** on the arc heat source,plasma heat source and laser heat source,three kinds of high density heat source remanufacturing forming technologies,such as high speed arc spraying forming technology,micro-arc plasma forming technology,and laser cladding forming technology,have been *** benefits of remanufacturing forming based on advanced surface engineering technologies are great.

关键词： remanufacturing forming surface engineering technology high density heat source

Progress of Nondestructive Detection Technology on Remanufacturing Coatings

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稀有金属材料与工程 2012年第S1期41卷 399-402页

作者： Kang Jiajie Xu Binshi wang haidou wang Chengbiao Acad Armored Forces Engn Natl Key Lab Remfg Beijing 100072 Peoples R China China Univ Geosci Sch Engn & Technol Beijing 100083 Peoples R China

The defects of remanufacturing coatings,such as micro-cracks,micro-pores,oxide inclusion,and fatigue cracks producing in the service process have great influence on the qualities and lives of remanufacturing *** paper summarizes several methods used for detecting coating defects,including ray method,ultrasonic method,eddy method,magnetic memory method,acoustic emission *** advantages and limitations of the above methods are also *** detection results by ray method are visualized,and it is easy to achieve qualitative,quantitative and locating detection,but this method has incipient fault and low detecting *** detection can exactly locate defects,and it is sensitive to plane defects,but the detection has dead zones,and it is inconvenient to perform qualitative and quantitative *** method detects fast,but it only can detect conductive materials,and is difficult to achieve qualitative,quantitative and locating *** memory method is sensitive to ferromagnetic materials,but it can not detect nonferromagnetic materials and is difficult to attain quantitative *** emission method has an extensive detection range and high sensitivity,but it has big noise interference,and is hard to achieve qualitative *** conclusion,it describes the application prospect of each method for detecting coating.

关键词： remanufacturing coating defect nondestructive detection

Effects of Service Condition on Rolling Contact Fatigue Failure Mechanism and Lifetime of Thermal Spray Coatings——A Review

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Chinese Journal of Mechanical Engineering 2015年第1期28卷 132-139页

作者： CUI Huawei CUI Xiufang wang haidou XING Zhiguo JIN Guo Institute of Surface/Interface Science and Technology Harbin Engineering University National Key Lab for Remanufacturing Academy of Armored Forces Engineering

The service condition determines the Roiling Contact Fatigue（RCF） failure mechanism and lifetime under ascertain material structure integrity parameter of thermal spray coating. The available literature on the RCF testing of thermal spray coatings under various condition services is considerable; it is generally difficult to synthesize all of the result to obtain a comprehensive understanding of the parameters which has a great effect on a thermal spray coating＇s resistance of RCF. The effects of service conditions（lubrication states, contact stresses, revolve speed, and slip ratio） on the changing of thermal spray coatings＇ contact fatigue lifetime is introduced systematically. The effects of different service condition on RCF failure mechanism of thermal spray coating from the change of material structure integrity are also summarized. Moreover, In order to enhance the RCF performance, the parameter optimal design formula of service condition and material structure integrity is proposed based on the effect of service condition on thermal spray coatings＇ contact fatigue lifetime and RCF failure mechanism. The shortage of available literature and the forecast focus in future researches are discussed based on available research. The explicit result of RCF lifetime law and parameter optimal design formula in term of lubrication states, contact stresses, revolve speed, and slip ratio, is significant to improve the RCF performance on the engineering application.

关键词： rolling contact fatigue lubrication conditions contact stress revolve speed slip ratio

Design and application of friction pair surface modification coating for remanufacturing

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Friction 2017年第3期5卷 351-360页

作者： haidou wang Guozheng MA Binshi XU Qingsong YONG Pengfei HE National Key Lab for Remanufacturing Academy of Armored Forces Engineering Beijing 100072 China National Key Lab for Remanufacturing Academy of Armored Forces Engineering Beijing 100072 ChinaChina Aerodynamics Research and Development Center Mianyang 621000 China

Friction,wear,and contact fatigue are the main causes of energy loss,material waste,and equipment *** aim of remanufacturing is to repair and modify the damaged equipment surface,and the surface coating is the major material that allows the remanufactured parts to be used in a new round of ***,the design and preparation of surface coatings are very important to repair,strengthen,or modify the friction pairs,in order to ensure long-term operation of the remanufactured ***1y,a lot of research on designing and preparing friction pair surface modification coatings has been conducted by the National Key Laboratory for Remanufacturing (NKLR).The research conducted achieved the following goals:the mechanism of micro/nano multilayer surface modification coatings with long-term efficacy life was revealed,and the corresponding design considerations and preparation methods of nanocrystalline micro tribological coatings were innovatively developed.A series of new 'two-step' processes to prepare sulfide solid lubricating coatings were *** competitive failure mechanism of the surface coating in simultaneous wear and fatigue conditions was revealed,and some composite coatings with dual properties of wear resistance and fatigue resistance were *** on the stress distribution of friction surface contact areas and the piezoelectric effect,a failure warning intelligent coating is designed and *** coatings have been successfully applied to critical friction components,such as the spindle of large centrifugal compressors,engine cylinder piston components,and driver gear pairs.

关键词： remanufacturing surface coating solid lubrication contact fatigue intelligent sensing coating

Effect of TGO on the tensile failure behavior of thermal barrier coatings

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Frontiers of Mechanical Engineering 2019年第4期14卷 452-460页

作者： Le wang Yuelan DI Ying LIU haidou wang Haoxing YOU Tao LIU School of Mechatronics Engineering Nanchang UniversityNanchang 330031China National Key Laboratory for Remanufacturing Academy of Army Armored ForcesBeijing 100072China State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China

Thermally grown oxide(TGO)may be generated in thermal barrier coatings(TBCs)after high-temperature *** increases the internal stress of the coatings,leading to the spalling of the *** electron microscopy and energy-dispersive spectroscopy were used to investigate the growth characteristics,microstructure,and composition of TGO after high-temperature oxidation for 0,10,30,and 50 h,and the results were systematically *** emission(AE)signals and the strain on the coating surface under static load were measured with AE technology and digital image *** showed that TGO gradually grew and thickened with the increase in oxidation *** thickened TGO had preferential multi-cracks at the interface of TGO and the bond layer and delayed the strain on the surface of the coating under tensile *** growth resulted in the generation of pores at the interface between the TGO and bond *** pores produced by TGO under tensile load delayed the generation of surface cracks and thus prolonged the failure time of TBCs.

关键词： thermally grown oxides thermal barrier coatings acoustic emission technology digital image correlation pores

A review of novel ternary nano-layered MAX phases reinforced AZ91D magnesium composite

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Journal of Magnesium and Alloys 2022年第6期10卷 1457-1475页

作者： Wantong Chen Wenbo Yu Chaosheng Ma Guozheng Ma Laiqi Zhang haidou wang Center of Materials Science and Engineering School of Mechanical and Electronic Control EngineeringBeijing Jiaotong UniversityBeijing 100044China National Key Lab for Remanufacturing Army Academy of Armored ForcesBeijing 100072China State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing100083China

In recent decades, the demand for lightweight and high specific strength materials brings about the development of magnesium matrix composites. Different from some traditional binary ceramic particles, such as SiC, Al_(2)O_(3), the novel ternary nano-layered M_(n+1)AX_(n)(MAX)phase carbide or nitride ceramics exhibit metal-like properties and self-lubricate capacity(where “M” is an early transition metal, “A” belongs to the group A element, “X” is C or/and N, and n = 1–3). Ti_(2)AlC, as the representative of the MAX phase, was interestingly introduced into the magnesium matrix. Layered Ti_(2)AlC MAX phased reinforced AZ91D magnesium composites manufactured through the stir casting exhibit sufficient deformation capacity due to unique deformation behaviors of MAX, namely delamination and the formation of kinking band. Further,the Ti_(2)AlC-AZ91D composites exhibit a distinctive characteristic in strengthening mechanism, damping mechanism and tribological capacity due to the other special properties of MAX phase, such as self-lubricated property. Accordingly, to give a comprehensive understanding, we overviewed the fabrication process, microstructural characterization, mechanical properties, damping property and tribological capacity on these composites. In order to understand the A-site effect in MAX phase on the microstructure, we introduced another representative Ti_(3)SiC_(2)MAX phase to explain the interfacial evolution. In addition, due to the high aspect ratio of MAX, MAX particles could be orientationally regulated in Mg matrix by plastic deformation such as hot extrusion. Herein, we discussed the anisotropic mechanical and physical properties of the textured composites produced by hot extrusion. Moreover, the potential applications and future development trends of MAX phases reinforced magnesium matrix composites were also given and prospected.

关键词： Ternary MAX phases Magnesium composite Damping Mechanical properties Anisotropic Tribological capacity

Response surface regression analysis on FeCrBSi particle in-flight properties by plasma spray

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Frontiers of Mechanical Engineering 2016年第3期11卷 250-257页

作者： Runbo MA Lihong DONG haidou wang Shuying CHEN Zhiguo XING National Key Laboratory for Remanufacturing Academy of Armored Forces Engineering Beijing 100072 China

This work discusses the interactive effects between every two of argon flow rate, voltage, and spray distance on in-flight particles by plasma spray and constructs models that can be used in predicting and analyzing average velocity and temperature. Results of the response surface methodology show that the interactive effects between voltage and spray distance on particle in- flight properties are significant. For a given argon flow rate, particle velocity and temperature response surface are obviously bending, and a saddle point exists. With an increase in spray distance, the interactive effects between voltage and argon flow rate on particle in-flight properties appear gradually and then weaken. With an increase in voltage, the interactive effects between spray distance and argon flow rate on particle in-flight properties change from appearing to strengthening and then to weakening.

关键词： particle velocity particle temperature interactive effects response surface

Fatigue features study on the crankshaft material of 42CrMo steel using acoustic emission

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Frontiers of Mechanical Engineering 2016年第3期11卷 233-241页

作者： Yue SHI Lihong DONG haidou wang Guolu LI Shenshui LIU School of Materials Science and Engineering Hebei University ofTechnology Tianjin 300130 China National Key Laboratory for Remanufacturing Academy of ArmoredForces Engineering Beijing 100072 China

Crankshaft is regarded as an important component of engines, and it is an important application of remanufacturing because of its high added value. However, the fatigue failure research of remanufactured crankshaft is still in its primary stage. Thus, monitoring and investigating the fatigue failure of the remanufacturing crankshaft is crucial. In this paper, acoustic emission （AE） technology and machine vision are used to monitor the four-point bending fatigue of 42CrMo, which is the material of crankshaft. The specimens are divided into two categories, namely, pre-existing crack and non-pre- existing crack, which simulate the crankshaft and crank- shaft blank, respectively. The analysis methods of para- meter-based AE techniques, wavelet transform （WT） and SEM analysis are combined to identify the stage of fatigue failure. The stage of fatigue failure is the basis of using AE technology in the field of remanufacturing crankshafts. The experiment results show that the fatigue crack propagation style is a transgranular fracture and the fracture is a brittle fracture. The difference mainly depends on the form of crack initiation. Various AE signals are detected by parameter analysis method. Wavelet threshold denoising and WT are combined to extract the spectral features of AE signals at different fatigue failure stages.

关键词： acoustic emission fatigue failure remanufac- turing crankshaft wavelet analysis

Change in Surface Microstructure and Properties of PTFE after Solar Radiation and its Mechanism

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Journal of Wuhan University of Technology(Materials Science) 2019年第1期34卷 223-229页

作者： MA Guozheng wang haidou China Huayin Ordnance Test Center National Key Laboratory for Remanufacturing Academy of Armored Forces Engineering

A series of solar radiation tests for the polytetrafluoroethylene(PTFE) bulk and film samples were carried out using Q-SUN XE-3-HSC type Solar Radiation Simulator, with the test parameters as follows: radiation intensity is 1 120 W/m^2, temperature is 55 ℃ and humidity is 70% RH. Surface morphology, composition and microstructure of the PTFE samples before and after radiation tests were characterized contrastively. Effect of solar radiation on the tribology and wetting properties of PTFE were also studied by tribometer and contact angle tester, respectively. The results show that, for radiated PTFE, surface roughness, the relative content of C element, the friction coefficients and the contact angle with water increased in varying degrees. In conclusion, the obvious change in PTFE samples can be mainly attributed to break of(CFx)-C bonds after bombardment of high energy UV photons, which causes the loss of F-rich groups, oxidation, crosslinking and restructuring of active unsaturated groups.

关键词： solar radiation PTFE microstructure tribological properties wetting properties