Papers by Keyword: Wear Resistance

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Authors: Jing Lai Tian, Fang Xia Ye, Li Sheng Zhong, Yun Hua Xu
Abstract: In-situ production of (Fe,Cr)7C3 particulate bundles -reinforced iron matrix composite was prepared by infiltration casting between Cr wires and white cast iron at 1200°C plus subsequent heat treatment. The composites under different heat treatment times were comparatively characterized by scanning electron microscopy (SEM) and pin-on-disc wear resistance tests. The results show that the area of the particle bundles gradually increases with the heat treatment time increasing, and the chemical compositions change from eutectic to hypoeutectic, the morphologies of the reinforcements present chrysanthemum-shaped, granular and intercrystalline eutectics. Under 5 N loads, the composites appear excellent wear resistance, which is 36 times for the reference sample.
Authors: Jing Wang, Yi Chao Ding, Hong Cheng, Yi San Wang
Abstract: TiC particulates reinforced iron matrix surface composite was produced by cast technique and in-situ synthesis technique. The surface composite was investigated from thermodynamics, microstructure, wear-resistance and oxidation-resistance. The results show TiC particles whose volume fraction is about 40% exhibit fine size in iron matrix on the surface composite. An excellent metallurgy-bond is observed between the surface composite and the gray iron. Fe-TiC surface composite shows good oxidation-resistance at 900°C and great wear-resistance under condition of dry sliding.
Authors: Lin Zong, Zheng Jun Liu
Abstract: The in-situ ceramic phases reinforced Fe-based surface coating had been produced by prepared high-carbon ferrochromium, ferrovanadium and graphite power on 20g steel through plasma transferred arc weld-surfacing process(PTA). The microstructure and properties were investigated by means of optical microscopy(op), scanning electron microscopy(SEM), X-ray diffraction(XRD) and microhardness meter. The results showed that the substrate and the coating formed good metallurgical bonding.The microstructure of coating consists of primary M7C3 carbide and eutectic structures[M+γ′+M7C3+VC]. The primary hexagonal (Fe,Cr,V)7C3 with larger size evenly distributed in coating and the fine VC particles were globular shape. The microhardness appeared reasonable distribution from substrate to the top ,which ensured that the materials had good abrasive wear resistance.
Authors: Yu Tong, Tian Wen Guo, Jing Wang, Hai Feng Liang, Qian Mi
Abstract: Two different surface engineering technologies, plasma nitriding and titanium nitride (TiN) film deposition by closed-field unbalanced magnetron sputtering (CFUBMS), were used to improve the tribological properties of pure titanium. Surface characteristics were evaluated by microhardness tester, scanning electron microscopy(SEM), X-ray diffraction (XRD) and pin-on-disc tribotester. The influence of the two surface treatments on wear resistance of titanium was investigated. After plasma nitriding or TiN film deposition by CFUBMS, the microhardness of the surface increased approximately 3 to 5 times when compared with that of untreated pure titanium and the wear resistance was improved significantly. The wear resistance of TiN film deposited titanium specimens was higher than that of plasma nitrided ones.
Authors: Norbert Kazamer, Dragos Toader Pascal, Gabriela Marginean, Viorel Aurel Şerban, Cosmin Codrean, Ion Dragoş Uţu
Abstract: In order to be competitive, it is demanded to have thin, tough and long lasting coatings. An important aspect is to use stable deposition technologies. As Cr assures wear, corrosion and high temperature resistance, the most employed coatings in industry generally contain Cr. Nevertheless, Cr is a hazardous element for the humans’ health, therefore, sustainable alternatives are needed to be implemented. The aim of this work is to investigate the microstructure, hardness, corrosion resistance and wear behavior of the novel WC-CoMo compared to conventional WC-Co coatings. So far, WC-CoMo coatings are not part of state of the art regarding the Atmospheric Plasma Sprayed (APS) coatings. WC-Co powder in plain form and mechanically mixed with Mo was deposited using the APS method on standardized Type A Almen Strips (C67 steel). The size of the powder grains varies between 5 µm and 30 µm. The obtained samples were investigated by means of Scanning Electron Microscopy, Energy Dispersive X-Ray Spectroscopy, X-Ray Diffraction, and hardness, wear and corrosion behavior were also evaluated. Results revealed formation of different intermetallic phases around the WC particles, which have a benefic influence on the coating characteristics and microstructure.
Authors: Anna da Forno, Massimiliano Bestetti
Abstract: In this paper a protection process against corrosion and wear for AM60B magnesium alloys, by multilayer approach, is related. The coating consists of a porous oxide layer, obtained in micro-arc anodizing regime, and two or three layers deposited by sol-gel technique. The anodic oxidation pre-treatment improves the adhesion of the sol-gel layers, which are responsible for the sealing of the anodic oxide pores and for the corrosion protection effect. In addition the multilayer system significantly improves AM60B alloy wear resistance. Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD) were employed to assess morphology and crystallographic structure. Electrochemical polarization and wear tests were performed in order to evaluate the corrosion resistance behaviour and the wear resistance of the coated magnesium alloys.
Authors: F. Farhani, Keyvan Seyedi Niaki
Abstract: Treatment of alloy steels at cryogenic temperatures increases their wear resistance, which is an important consideration in industrial applications. The treatment of metal samples is performed in a dedicated cryogenic processor, with provisions for precise time/temperature control of the samples on the basis of pre-defined temperature protocols. There is little information on the design and construction of cryogenic processors in the open literature. In this paper, development of a simple and inexpensive programmable processor for treatment of metals at cryogenic temperatures has been presented. Considerations for the selection of suitable cooling method and reduction of liquid nitrogen consumption have been discussed. To demonstrate the usefulness of this processor, a metal sample has been cryotreated. Results of the treatment show a more uniform microstructure and less retained austenite in the treated metal sample, which is due to the transformation of most of austenite into the harder martensite phase. Overall results show that the design methodology presented in this paper can be adopted by other researchers for constructing similar processors for studying the effect of cryogenic temperatures on enhancement of wear resistance and other mechanical properties in metals.
Authors: Alexander G. Ovcharenko, Andrey Yu. Kozlyuk, Mikhail O. Kurepin
Abstract: Abstract. A promising method for improving wear resistance of metal cutting tools including pre-heating and a subsequent impact of the pulsed magnetic field of high intensity on the cutting tool is proposed. The experimental setup and methods of research are described. Experimental studies of surfaces of carbide reversible cutting plates of the VK8, T15K6 alloy and drills of high speed steel R6M5 to assess the effectiveness of the proposed method were performed. An increase in wear resistance of cutting tools made of the T15K6 hard-alloy plates by 30% and made of the VK8 alloy plates by 13% was revealed while wear resistance of drills made of steel R6M5 increased on average by 58% The proposed method can be of practical interest for hardening the surface of other types of tools and machine parts for further experimental verification.
Authors: Jian Jun Xu, Jin Fang Guo, De Guo Wang, Li Shan Cui
Authors: Noor Azlina Rejab, Mohd Sallehuddin Yusof, M.I. Maksud, M.N. Nodin
Abstract: Nowadays the usage of polymer on articular replacement (arthropasty) is common because of their known usage in orthopedic surgery and biocompatibility. The polymeric material such as polyethylene and polyacetal are common materials used in surgical repair of joint due to the arthritic or dysfunctional joint surface. The surgical repair is done by replacing the damage part with something better or remodeling or realigning the joint by osteotomy procedures. In this case, for both hip and knee replacement, chrome-cobalt and polymer are commonly used. According to Jennifer Brown, the cost for knee replacement is approximate to USD$15,000 per procedure with the estimation of total knee replacement is 600,000 annually in United States. Currently, the aggregate of annual cost for total knee replacement is about USD$9 billion. The usage of chrome-cobalt and polymer is very common and save but the cost is very expensive. The other disadvantage is it usually last only for 10 years for hip and knee replacement.
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