检索结果-南通市图书馆

Effect of sliding speed on elevated-temperature wear behavior of AISI H13 steel

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2021年第9期28卷 1180-1189页

作者： Yin Zhou Wei Jiang School of Shipping and Mechatronic Engineering Taizhou UniversityTaizhou225300JiangsuChina Light Alloy Research Institute Central South UniversityChangsha410083HunanChina

Elevated-temperature wear tests were performed on AISI H13 steel under 50 and 100 r/min at 400–600℃.Through examining the morphology,structure and composition of worn surfaces as well as the microhardness at subsurfaces,the wear mechanisms in various sliding conditions were explored.H13 steel exhibited totally different elevated-temperature wear behavior at two sliding speeds while the high sliding speed would seriously deteriorate its wear *** sliding at two sliding speeds,the wear rate of H13 steel decreased first and then rose with the increase in temperature and the wear rate reached the lowest value(lower than 1×10^(–6)mm^(3)/mm)at 500℃and 50 r/*** wear rate at 600℃was lower than that at 400℃for 50 r/min,but the wear rate at 600℃was higher than that at 400℃for 100 r/min(except for 50 N).At 50 r/min,the wear rate decreased first and then increased with the increase in ***,at 100 r/min,the wear rate monotonically increased with increasing load and reached 33×10^(–6)mm^(3)/mm at 600℃and 150 N,where severe wear *** the other sliding conditions,severe wear did not appear with wear rate lower than 5×10^(–6)mm^(3)/*** mild wear merely prevailed at 500℃and 50 r/min and oxidative wear appeared in the other sliding conditions except for 600℃and 150 N,where severe plastic extrusion wear *** effect of sliding speed on wear behavior was attributed to the changes of tribo-oxide *** elevated-temperature sliding,tribo-oxide particles were more readily retained to form protective tribo-oxide layers on worn surfaces at the lower sliding speed than at the higher sliding speed,so as to protect from wear.

关键词： AISI H13 steel Dry sliding wear Elevated-temperature wear wear testing Surface analysis wear mechanism Sliding speed

Dry Sliding Tribological Properties of a Dendrite-reinforced Zr-based Bulk Metallic Glass Matrix Composite

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2014年第6期30卷 576-583页

作者： Huijun Yang Yong Liu Teng Zhang Hengpeng Wang Bin Tang Junwei Qiao Research Institute of Surface Engineering Taiyuan University of Technology Laboratory of Applied Physics and Mechanics of Advanced Materials College of Materials Science and Engineering Taiyuan University of Technology

In-situ dendrite-reinforced metallic glass matrix （MGM） composites with the composition of Zr58.5Ti14.3Nb5.2Cu6.1Ni4.9Be11.0 were prepared with a vacuum arc melter by the copper mold suction casting. Effect of different normal loads and sliding velocities on the tribological properties of MGM composites was studied. The results showed that the friction coefficient and wear rate of composites initially descended with increasing the normal load and reached a minimum of 0.339 and 1.826 × 10^-4 mm^3/（N m） at 10 N, respectively, then ascended. Similarly, the friction coefficient and wear rate of composites initially decreased with the increase in the sliding velocity and reached a minimum of 0.330 and 2.389 × 10^-4 mm^3/（N m） at 0.4 m/s and 0.3 m/s, respectively, then raised. The wear mechanism of composites was mainly adhesive wear accompanied by abrasive wear at lower normal load and sliding velocity. However, the wear mechanism of composites was abrasive wear and adhesive wear as well as delamination at higher normal load and sliding velocity due to the nucleation and propagation of surface and subsurface cracks during the wear process. The flake-like and particle-like wear debris was the dominant shapes of debris observed.

关键词： Sliding wear Sliding friction Surface topography Surface analysis wear testing

Enhancing wear Resistance of A356 Alloy by Adding CNFs Based on Ultrasonic Vibration Casting

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2018年第5期31卷 523-532页

作者： Qing-Jie Wu Hong Yan Peng-Xiang Zhang Xue-Qin Zhu Qiao Nie School of Mechanical and Electrical Engineering Nanchang University Nanchang 330031 China Key Laboratory of Light Alloy Preparation and Processing in Nanchang City Nanchang 330031 China Jiangxi Ling-Ge Non-ferrous Metal Processing Co. Ltd.Nanchang 330008 China

A356–carbon nanofibers（CNFs） composites with different contents of CNFs were fabricated by ultrasonic vibration casting to investigate the effect of CNFs in the matrix on the mechanical properties and wear resistance. The worn surfaces were investigated using scanning electron microscopy（SEM）. As the CNFs content was increased, strength,hardness and wear resistance were significantly enhanced and the coefficient of friction was extremely reduced. The nanocomposite containing 1.2 wt% of CNFs exhibited more than 109 HV in hardness and less than 0.35 in the coefficient of friction. Compared with the as-cast matrix, the wear rate of the optimal composite was less than one-third of the matrix sample and the microhardness exhibited about 47% enhancement of the matrix. Meanwhile, steadier and lower friction coefficient was also achieved by the composite. CNFs were observed to be either partially or fully crushed forming a carbon film that covered the surface and acted as a solid lubricant, enhancing the wear behavior significantly.

关键词： A356 matrix composites Carbon nanofibers wear testing

Effect of Replacing Vanadium by Niobium and Iron on the Tribological Behavior of HIPed Titanium Alloys

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2017年第11期30卷 1089-1099页

作者： Mamoun Fellah Linda Aissani Mohammed Abdul Samad Alain Iosts Touhami Mohamed Zine Alex Montagnes Corinne Nouveau Mechanical Engineering Department ABBES Laghrour University P.O. 1252 40004 Khenchela Algeria Tribology Materials Surface and Interfaces GroupLaboratory of Foundry BADJI Mokhtar University BO 12CP 23000 Annaba Algeria Physics Department ABBES Laghrour University P.O.1252 40004 Khenchela Algeria Mechanical Engineering Department KFUPM Box 1180Dhahran 31261 Kingdom of Saudi Arabia Laboratory of Mechanics Surfaces and Processing Materials ARTS ET METIERS ParisTech Boulevard Louis XIV 859046 Lille Cedex France La.Bo.Ma.P ENSAM Rue Porte de Paris 71250 ClunyFrance

This study aims to examine the effect of replacing vanadium by niobium and iron on the tribological behavior of hot-isostatic-pressed titanium alloy （Ti-6Al-4V） biomaterial, using a ball-on-disk-type oscillating tribometer, under wet conditions using physiological solution in accordance with the ISO7148 standards. The tests were carried out under a normal load of 6 N, with an AISI 52100 grade steel ball as a counter face. The morphological changes and structural evolution of the nanoparticle powders using different milling times （2, 6, 12 and 18 h） were studied. The morphological characterization indicated that the particle and crystallite size continuously decrease with increasing milling time to reach the lowest value of 4 nm at 18-h milling. The friction coefficient and wear rate were lower in the samples milled at 18 h （0.226, 0.297 and 0.423; and 0.66 × 10-2, 0.87 × 10-2 and 1.51 × 10-2 μm3 N-1 i, tm-1） for Ti-6Al-4Fe, Ti-6A1-7Nb and Ti-6Al-4V, respectively. This improvement in friction and wear resistance is attributed to the grain refinement at 18-h milling. The Ti-6Al-4Fe samples showed good tribological performance for all milling times.

关键词： Tribological behavior Titanium alloys wear testing Nanotribology Milling time Hot isostatic pressing(HIPing)

Synthesis and Tribological Behaviors of Ti_3SiC_2 Material Prepared by Vacuum Sintering Technique

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2013年第3期28卷 417-424页

作者：史晓亮 ZHAI Wenzheng PENG Meichao ZHU Zhiwei WANG Mang XU Zengshi YAO Jie SONG Siyuan Abid Qamar ud Din School of Mechanical and Electronic Engineering Wuhan University of Technology School of Materials Science and Engineering Wuhan University of Technology

The bulk Ti3SiC2 specimens with less than 1 wt% TiC impurity were prepared by vacuum sintering technique, and the average grain size was about 5-6 μm in the elongated direction. When the sintering temperature, soaking time and heating rate were 1 400 ℃, 1 h and 10℃·min-1, respectively, the highest relative density of Ti3SiC2 specimens could reach 97.8%. Meanwhile, the lowest coefficient of friction （COF） and wear rate （WR） of the Ti3SiC2 samples were 0.55 and 1.37×10-3 mm3（Nm）-1 at a sliding speed of 0.35 m/s, load pressure of 10 N and ambient condition, respectively. The COF of the Ti3SiC2 sample reduced with the increasing of the load pressure, while the WRs fluctuated little. The WR increased with the increasing of the sliding speed, and weakly influenced the COF. These changing behaviors could be attributed to the presence and coverage of the amorphous mixture oxide film ofTi, Si, A1, and Fe on the Ti3SiC2 friction surface. The self- antifriction mechanism led to reducing of the COF. The increasing of the WR was attributed to the wearing consumption.

关键词： bulk Ti3SiC2 vacuum sintering wear testing surface analysis

Effects of Duration on wear Rate of A PTFE Composite

在线全文

学校读者我要写书评

暂无评论

Effects of Duration on Wear Rate of A PTFE Composite

Dry sliding friction and wear behaviors of Mg_2B_2O_5 whisker reinforced 6061Al matrix composites

2014中国功能材料科技与产业高层论坛

作者： Hu Hanjun Zhou Hui Zheng Yugang Zhang Kaifeng Wan Zhihua Gou Shining Wu Jin-long Lanzhou Institute of Physics ChinaAcademy of Space Technology

ISBN: (纸本)9783038353522

A type of PTFE/MoS/glass fiber composite has been used as bearing cage *** study the friction properties,the tests have been performed under various parameters on *** experimental results were as follows:wear rate of the polymer composites was dramatically affected by test *** increase of test duration,the wear rate rapidly *** the sliding velocity of 1.83m/s and load of 45N,the highest wear rate was 8.85×10m/N?m in the test of duration 0.5h,while the lowest was 0.88×l0-15m3/N·m in the test of duration 10h(the minimum and maximum times examined).

关键词： Polymers Sliding wear wear testing Abrasion

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2014年第1期24卷 49-57页

作者：金培鹏陈庚韩丽王金辉青海大学机械工程学院西宁810016

The friction and wear properties of Mg2B2O5 whisker reinforced 6061Al matrix composite fabricated via power ultrasonic-stir casting process were investigated using a ball-on-disk wear-testing machine against a GCr45 steel counterface under dry sliding conditions. The reinforcements include as-received Mg2B2O5 whiskers and Mg2B2O5 whiskers coated with CuO and ZnO. The volume fraction of the composites is 2%. The relationship between the wear rate and the coefficient of friction was discussed. The results indicate that the wear rate of the Mg2B2O5 whiskers coated with ZnO reinforced aluminum matrix composites is the lowest among the materials. As the applied load and sliding speed steadily increase the coefficients of friction and wear rates of the as-received matrix alloy and the fabricated composites decrease. As the applied load and sliding speed increase, the wear mechanisms of the composites shift from a mild to a severe regime.

关键词： metal-matrix composite sliding wear wear testing wear mechanism

Influence of niobium and molybdenum addition on microstructure and wear behavior of laser-borided layers produced on Nimonic 80A-alloy

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2019年第2期29卷 322-337页

作者： N.MAKUCH P.DZIARSKI M.KULKA A.PIASECKI M.TULI?SKI R.MAJCHROWSKI Institute of Materials Science and Engineering Poznan University of Technology Institute of Mechanical Technology Poznan University of Technology

Laser alloying was used for production of thick layers on surface of Nimonic *** laser surface modification,three types of pre-coated pastes were applied:with amorphous boron,with amorphous boron and molybdenum as well as with amorphous boron and *** microstructure,hardness and wear resistance of produced layers were studied in *** presence of different types of borides in re-melted zone depended on the paste composition and caused an increase in hardness up to about HV *** wear resistance was evaluated by calculation of mass wear intensity factor Imw and relative mass loss of specimen and *** wear behavior of the tested frictional pairs was determined by 3D interference microscopy,scanning electron microscopy equipped with EDS *** significant increase in abrasive wear resistance was observed in comparison to untreated Nimonic *** lowest mass loss intensity factor was characteristic of laser-alloyed Nimonic 80A-alloy with boron and niobium(Imw=1.234 mg/(cm2?h)).Laser alloyed-layers indicated abrasive wear mechanism with clearly visible *** alloying with boron and niobium resulted in the additional oxidative wear *** this case,EDS patterns revealed presence of oxygen on the worn surface of specimen.

关键词： laser alloying surface topography wear testing surface analysis wear mechanism nickel alloy