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A n investigation of microstructure and tribological performance of the WC CrCo coating

C. J. SHEN1,* , Y. ZHOU2,3, H. ZHANG3, Z. CHEN2, J.ZHOU2

Affiliation

  1. Shool of Material Science and Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221008, P.R. China
  2. School of Material Science and Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221008, P.R. China
  3. XCMG Excavator Machinery CO. LTD, Xuzhou Jiangsu 221004, P.R. China

Abstract

In order to improve the wear resistance of dipper made of AISI 1035 the WC CrCo coating was sprayed on AISI 1035 by HVOF. Afterwards, the m icrostructure and tribolog ical performance were evaluated, and the tribological properties and wear mechanisms were mainly investigated in terms of dry friction, lubrication and composite medium. The results showed that the as spra yed WC CrCo coating had a homogeneous and dense mic rostructure, only with little WC decarburization , and t he WC CrCo coating had a great comprehensive property with the HV 0.2 is 1391 and the fracture toughness is 3.78 MPa.m 1/2 Additionally, t he wear rate subjected to under dry friction was as small as 3.87 ×10 8 g/Nm, and worn surfaces showed severe lamellar fracture . While wear mechanism under lubricated condition was plastic deformation and abrasive wear. Under composite medium friction , the wear damage was described by the micro grinding and polishing, and wear mechanism conformed to the corresponding tribo media. Finally difference in wear mechanism was explained in terms of the medium interaction..

Keywords

High velocity oxy fuel spraying, WC CrCo, Wear resistance Friction behavior Tribo media.

Citation

C. J. SHEN, Y. ZHOU, H. ZHANG, Z. CHEN, J.ZHOU, A n investigation of microstructure and tribological performance of the WC CrCo coating, Optoelectronics and Advanced Materials - Rapid Communications, 8, 7-8, July-August 2014, pp.754-761 (2014).

Submitted at: Feb. 5, 2012

Accepted at: July 10, 2014