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Characteristics and mechanism of abrasive wear for thermoplastic polymers

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Journal of University of Science and Technology Beijing 2003年第5期10卷 44-47页

作者： XianJia XiaomeiLing DepartmentofScienceandTechnology UniversityofScienceandTechnologyBeijingBeijing100083China DepartmentofAnalyticalChemistry SchoolofPharmaceuticalSciencePekingUniversityBeijing100083China

Abrasive wear characteristics of polyethylene, polystyrene,polymethylmethacrylate, nylon 1010 and polyvinyl chloride were investigated. The volume relativewear resistance coefficients of these thermoplastic polymers are 18%-35% (hardened and lowtemperature tempered steel 45 was used as a comparing material), and have a linear correlation withsquare roots of their cohesive energy densities. The coefficients of linear correlation is *** morphologies were observed by scanning electron microscope (SEM). Main wear mechanism of thethermoplastic polymers includes brittle breaking for the hard and brittle polymers & plowing andfatiguing for the soft and tough ones.

关键词： polymer abrasive wear wear mechanism cohesive energy

Tool wear mechanisms in the machining of Nickel based super-alloys： A review

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Frontiers of Mechanical Engineering 2014年第2期9卷 106-119页

作者： Waseem AKHTAR Jianfei SUN Pengfei SUN Wuyi CHEN Zawar SALEEM School of Mechanical Engineering and Automation Beihang University Beijing 100191 China Mechanical Engineering department University of Engineering and Technology Taxila Pakistan

Nickel based super-alloys are widely employed in aircraft engines and gas turbines due to their high temperature strength, corrosion resistance and, excellent thermal fatigue properties. Conversely, these alloys are very difficult to machine and cause rapid wear of the cutting tool, frequent tool changes are thus required resulting in low economy of the machining process. This study provides a detailed review of the t0ol wear mechanism in the machining of nickel based super-alloys. Typical tool wear mechanisms found by different researchers are analyzed in order to find out the most prevalent wear mechanism affecting the tool life. The review of existing works has revealed interesting findings about the tool wear mechanisms in the machining of these alloys. Adhesion wear is found to be the main phenomenon leading to the cutting tool wear in this study.

关键词： tool wear nickel based super-alloy wear mechanism

Effect of TiC nanoparticle on friction and wear properties of TiC/AA2219 nanocomposites and its strengthening mechanism

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Journal of Central South University 2022年第3期29卷 767-779页

作者： YANG Yi-long ZHANG Yun ZHANG Hao-ming LIU Xu-he LI Xiao-qian School of Mechanical Engineering Henan University of EngineeringZhengzhou 451191China College of Mechanical and Electrical Engineering Central South UniversityChangsha 410083China State Key Laboratory of High Performance Complex Manufacturing Central South UniversityChangsha 410083China Light Alloys Research Institute Central South UniversityChangsha 410083China

TiC nanoparticles reinforced 2219 aluminum matrix composites were successfully prepared by ultrasonic casting, followed by forging and T6 heat treatment. The friction and wear properties of the disc-to-column were studied under four separate normal values of 5, 10, 20 and 30 N. The increasing hardness value of the nanocomposite may be attributed to the large amount of TiC(i.e., 1.3 wt.% and 1.7 wt.%) introduced to the composites. The friction coefficient of the nanocomposite decreased with the increase of TiC nanoparticles(0-1.7 wt.%) under the same load. But the wear resistance of the TiC/AA2219 nanocomposite increased by 30%-90% as compared to the 2219 matrix alloy. And it decreased with the increasing load. The composite with 0.9 wt.% TiC produced the best results in terms of friction and wear because of its relatively higher hardness and perfect ability to retain a transfer layer of a comparatively larger thickness. On the wear surface, some Al2O3particles were found which aided in the development of protective shear regions and improved the wear resistance. The wear mechanism for the TiC/AA2219 nanocomposite was a combination of adhesive and oxidative wear, with the composites containing hard TiC nanoparticles being mainly abrasive.

关键词： TiC/AA2219 nanocomposite TiC nanoparticle wear properties hardness wear mechanism

Facile synthesis of polyaniline nanorods to simultaneously enhance the mechanical properties and wear resistance of epoxy composites

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Frontiers of Chemical Science and Engineering 2023年第9期17卷 1254-1266页

作者： Liu Jiang Jinian Yang Jie Dong Shibin Nie Yuxuan Xu Xuesong Feng School of Materials Science and Engineering Anhui University of Science and TechnologyHuainan232001China School of Safety Science and Engineering Anhui University of Science and TechnologyHuainan232001China

To enhance the mechanical properties and wear resistance of epoxy resin,polyaniline nanorods were first synthesized using a facile route,and then introduced into the epoxy matrix to yield composites via solution *** measurements were conducted to investigate the phase structures and compositions of polyaniline nanorods,and their positive influences on the mechanical and tribological properties of epoxy resin were also *** results confirmed that the as-synthesized polyaniline exhibited representative rod-like morphologies and dispersed well in the epoxy matrix,leading to significant enhancements in the tensile strength and elastic modulus of epoxy *** highest values of 110.33 MPa and 2.04 GPa were obtained by adding 5%-7%polyaniline nanorods,which were 43%and 62%higher than the pure sample,*** wear rate was increased first and then decreased along with polyaniline nanorods,presenting the lowest value of 2.12×10^(−5) mm^(3)·Nm^(−1) by adding 5%filler,which was markedly reduced by ca.70%compared to the control ***,the possible wear mechanism was proposed and discussed in *** study tried to broaden the applications of polyaniline nanorods in the field of tribology.

关键词： epoxy resin polyaniline nanorods mechanical property tribological performance wear mechanism

A Hf-doped dual-phase high-entropy alloy: phase evolution and wear features

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Rare Metals 2024年第1期43卷 324-333页

作者： Hao Ren Rui-Run Chen Xue-Feng Gao Tong Liu Gang Qin Yu-Lung Chiu Shi-Ping Wu Jing-Jie Guo National Key Laboratory for Precision Hot Processing of Metals School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China School of Metallurgy and Materials University of BirminghamEdgbastonBirmingham B152TTUK

Initially defined high entropy alloys(HEAs)usually exhibit a single-phase solid-solution ***,two and/or more types of phases in HE As possibly induce the desired microstructure features,which contribute to improving the wear properties of HE ***,we prepare a series of(AlCoCrFeNi)_(100-x)Hf_(x)(x=0,2,4and 6;at%) HEAs and concern their phase compositions,micro structures and wear *** leads to the formation of(Ni,Co)_(2)Hf-type Laves phase and tailors the microstructure from a body-centered cubic(BCC) singlephase structure to a hypoeutectic *** increased hardness from~HV 512.3 to~HV 734.1 is due to solid-solution strengthening,grain refinement strengthening and precipitated phase *** a few oxides(Al_(2)O_(3)+Cr_(2)O_(3)) caused by the wear heating contribute to an 85.5% decrease in wear rate of the HEA system from6.71×10^(-5) to 0.97×10^(-5) m^(3)·N^(-1)·m^(-1).In addition,Hf addition changes the wear mechanism from abrasive wear,mild oxidative wear and adhesive wear to oxidative wear and adhesive wear.

关键词： High entropy alloy Laves phase Hardness wear mechanism

Microstructure and wear mechanisms of OCTG chasers

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Baosteel Technical Research 2023年第2期17卷 29-36页

作者： WANG Minghua HE Shuwen Research Institute Baoshan Iron&Steel Co.Ltd.Shanghai 201999China Shanghai University Shanghai 200072China

The wear mechanism and tool life of four types of oil country tubular goods chasers are studied herein via metallographic microscopy,scanning electron microscopy,and energy dispersive *** show that when the tool has a fine and uniform microstructure,the main failure mode is wear ***,observed phenomena including large chip bonding,coating peeling,cracks demonstrate that the main wear mechanisms of the tool are adhesive wear,abrasive wear,coating flaking,and microchipping.

关键词： OCTG chaser microstructure wear mechanism

wear behavior of copper material removal during fluid jet polishing:A comparative study between experiment and simulation

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Friction 2024年第8期12卷 1680-1695页

作者： Wenjing ZHANG Xin ZHANG Tiancheng AI Dan GUO Guoshun PAN State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China Guangdong Provincial Key Laboratory of Optomechatronics Shenzhen 518057China

As a crucial part in micro-electromechanical manufacture,local ultra-precision processing of highly ductile copper is expected to be realized by fluid jet polishing(FJP),which widely utilized in optical *** copper exhibits different wear behavior from stiff and brittle material,there is currently no abrasive wear prediction model applicable for copper to investigate the polishing *** research reveals that the copper material removal is dominated by deformation wear rather than cutting wear through abrasive jet impact experiments and localized wear scars analysis.A three-dimensional gas-liquid-particle triphasic wear model for copper in FJP is developed by considering impact energy and wear mechanism ***,validation assessments at various working pressures and impingement angles achieve the goodness-of-fit up to 0.92–0.97 in quantitative comparison between simulations and experimental measurements,which demonstrate the wear prediction ability of the proposed *** investigation facilitates a better understanding of copper wear mechanism and provides theoretical guidance for FJP process optimization.

关键词： fluid jet polishing(FJP) wear mechanism computational fluid mechanics wear model material removal

Experimental Study on wear and Spalling Behaviors of Railway Wheel

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Chinese Journal of Mechanical Engineering 2013年第6期26卷 1243-1249页

作者： WANG Wenjian GUO Jun LIU Qiyue Tribology Research Institute Southwest Jiaotong University

The current researches of the wear and spalling behaviors of wheel/rail materials focus on the field investigation rather than the mechanism. However, it is necessary and significant for clarifying the mechanism and relationship between the wear and spalling damage of railway wheel to test and reproduce the wheel damages in laboratory. The objective of this paper is to investigate the wear and spalling damage behaviors of railway wheel using a JD-1 wheel/rail simulation facility, which consists of a small wheel serving as rolling stock wheel, and a larger wheel serving as rail. The damage process of wheel roller is explored in terms of the creep ratio, axle load, and carbon content by means of various microscopic examinations. The experimental results show that the wear volume growth of wheel roller is proved to be proportional to the increase of the creep ratio and normal load between simulating wheel and rail. The increase of carbon content of wheel material causes a linear reduction in the wear volume. The microscopic examinations indicate that the rolling wear mechanism transfers from abrasive wear to adhesive and fatigue wear with an increase of tangential friction force, which results in the initiation of fatigue crack, and then aggravates spalling damage on the wheel roller surface. The surface hardness of material depends strongly upon its carbon content. The decrease of the carbon content of wheel material may alleviate spalling damage, but can cause a significant growth in the wear volume of wheel roller. Therefore, there is a competitive relationship between the wear and spalling damage of wheel material. This research proposes an important measure for alleviating or preventing the wear and spalling damage of railway wheel material.

关键词： wear spalling content carbon railway wheel wear mechanism

Effect of microstructure evolution on wear resistance of equal molar CoCrFeNi high-entropy alloy

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Rare Metals 2023年第11期42卷 3797-3805页

作者： Hai-Tao Zhang Cheng-Lin Wang Jun-Wei Miao Shu-Yan Shi Ting-Ju Li Hong-Wei Yan Yong-An Zhang Yi-Ping Lu Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian116024China Engineering Research Center of High Entropy Alloy Materials(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian116024China Key Laboratory for Light-Weight Materials Nanjing Technology UniversityNanjing210009China State Key Laboratory of Nonferrous Metals and Processes GRINM Group Co.Ltd.Beijing100088China General Research Institute for Nonferrous Metals Beijing100088China

Face-centered-cubic high-entropy alloys have excellent ductility and great potential for engineering ***,few studies have reported on the wear behavior under different *** study aimed to investigate the tribological behavior of CoCrFeNi highentropy alloy under different *** wear rate increased with the load,and the main wear behavior was abrasive *** cross-sectional microstructure of worn surface consisted of oxide,nanocrystalline,nanolaminated,and deformation *** the higher loads,the deformation mechanism included dislocation slip and deformation twins,and shear bands also *** was unexpectedly found that the wear rate increased sharply under high load,which was attributed to the formation of shear bands and microcracks in the nanocrystalline *** results successfully revealed the great influence of microstructure evolution on the wear rate,providing theoretical guidance for improving the wear resistance of face-centered-cubic high-entropy alloys in the future.

关键词： High-entropy alloys(HEAs) Microstructure evolution wear mechanism Shear bands