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Ji Y.P.,Beihang University | Wu S.J.,Beihang University | Xu L.J.,Henan University of Science and Technology | Xu L.J.,Henan Engineering Research Center for Wear of Materials | And 3 more authors.
Wear | Year: 2012

Compared with high chromium cast iron (HiCr), dry sliding wear behavior of high vanadium high speed steel (HVHSS) containing different amounts of carbon was investigated against a counter-face of 40Cr rings using a block-on-ring setup. Six HVHSS samples with 1.58-2.92. wt% carbon contents were prepared and tested under same conditions to investigate the effect of carbon. The results showed that all HVHSS samples possessed a superior wear resistance over HiCr, and the sample HVHSS4 with 2.58. wt% carbon possessed the highest wear resistance, which was further investigated under the normal load varying from 300. N to 500. N whilst the other wear parameters were kept constant. It was found that the wear loss of both HVHSS4 and HiCr samples increased with the increase of the applied normal loads, but at different increasing rates due to the transition of wear mechanism from micro-cutting to micro-cracking for HiCr. © 2012 Elsevier B.V.


Wang P.,Henan University of Science and Technology | Yang D.,Henan University of Science and Technology | Wei S.,Henan University of Science and Technology | Wei S.,Henan Engineering Research Center for Wear of Materials | And 4 more authors.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2010

Lanthanum-doped molybdenum powder was prepared by a liquid-liquid doping method and sol-gel technique, and then the lanthanum-doped molybdenum billet was obtained by isostatic pressing and sintering. The microstructure, morphology and RE phases of the materials in different states were analyzed using XRD, SEM, EDS, TEM etc. The results show that a chemical reaction between La (NO3)3 and (NH4)6Mo7O24 · 4H2O generates La3(MoO4)3. After calcination and reduction, RE phase exists in the molybdenum powder in the form of La2O3 and can refine the powder particles. La2O3 distribute dispersively in the molybdenum matrix after sintering into a billet. © 2010, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.


Li Y.,Henan University of Science and Technology | Wei S.-Z.,Henan University of Science and Technology | Wei S.-Z.,Henan Engineering Research Center for Wear of Materials | Wang X.-Y.,Henan Engineering Research Center for Wear of Materials | And 2 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2015

Al2O3 and carbon steel were brazed using Cu-Ti as active filler. The microstructure of the brazing zone of Al2O3 and carbon steel was characterized by means of transmission electron microscopy and scanning electron microscopy with energy dispersive spectrometer system and X-ray diffraction. The effects of brazing temperature (1050℃) and time(10-40 min)on the microstructure and the shear strength of the brazing zone were investigated. The results show that the good microstructure and higher shear strength for the brazing zone can be obtained at brazing temperature of 1050℃ for brazing time of 30 min. Three layers, which are reaction layer with Ti4Fe2O close to the ceramic Al2O3, brazing alloy layer of Cu solid solution and Ti4Fe2O, and diffusion layer with TiFe2 close to carbon steel, are formed at the brazing zone. The microstructure of the brazing zone is dense and its shear strength reaches 99 MPa. ©, 2015, Editorial Office of Transactions of Materials and Heat Treatment. All right reserved.

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