Wear resistance of laser clad TiC/Ti-Ti2 Co coating on titanium alloy

LIU Ming-kun; TANG Hai-bo; FANG Yan-li; ZHANG Shu-quan; LIU Dong; WANG Hua-ming

doi:10.3969/j.issn.1001-3806.2011.04.003

In order to improve the tribological properties of titanium alloy,a wear resistant coating with a microstructure consisting of insitu TiC primary dendrites and Ti-Ti2Co matrix was fabricated on a substrate of titanium alloy TC4 by means of laser cladding using Co-based alloy powders,activated carbon and titanium powders as the precursor materials.The microstructure and composition of the intermetallic composite coating was studied by means of optical microscope,scanning electron microscope,X-ray diffraction,energy dispersive spectrometer.The wear resistance of the coating was tested under dry sliding wear condition at room temperature.It is revealed that the laser clad composite coating has a rapidly solidified homogeneous microstructure and is metallurgically bonded to the substrate.The developed in situ TiC primary dendrites dispersed in the B-Ti-Ti2Co matrix of the coating as reinforcements.The B-Ti phase shows irregular crystal or cell dendrites.And most of the Ti2Co phase distributes over the matrix as irregular block crystal,with some lamellar Ti2Co formed in the inter-dendrite arms of the β-Ti phase.It is found that the microhardness of the coating is in the range of HV600～HV700.The laser clad TiC/ Ti-Ti2Co coating,in which the TiC phase plays a main role in enhancement,has excellent wear resistance under dry sliding wear test conditions.The results show that the coating is helpful to improve wear resistance of titanium alloy.

Wear resistance of laser clad TiC/Ti-Ti2 Co coating on titanium alloy

Corresponding author: TANG Hai-bo, tanghb@gmail.com;

1. Engineering Research Center of Ministry of Education on Laser Direct Manufacturing of Large Metal Components, Beihang University, Beijing 100191, China

Received Date: 2010-10-19

Accepted Date: 2010-10-28

Available Online: 2011-07-25

Abstract: In order to improve the tribological properties of titanium alloy,a wear resistant coating with a microstructure consisting of insitu TiC primary dendrites and Ti-Ti2Co matrix was fabricated on a substrate of titanium alloy TC4 by means of laser cladding using Co-based alloy powders,activated carbon and titanium powders as the precursor materials.The microstructure and composition of the intermetallic composite coating was studied by means of optical microscope,scanning electron microscope,X-ray diffraction,energy dispersive spectrometer.The wear resistance of the coating was tested under dry sliding wear condition at room temperature.It is revealed that the laser clad composite coating has a rapidly solidified homogeneous microstructure and is metallurgically bonded to the substrate.The developed in situ TiC primary dendrites dispersed in the B-Ti-Ti2Co matrix of the coating as reinforcements.The B-Ti phase shows irregular crystal or cell dendrites.And most of the Ti2Co phase distributes over the matrix as irregular block crystal,with some lamellar Ti2Co formed in the inter-dendrite arms of the β-Ti phase.It is found that the microhardness of the coating is in the range of HV600～HV700.The laser clad TiC/ Ti-Ti2Co coating,in which the TiC phase plays a main role in enhancement,has excellent wear resistance under dry sliding wear test conditions.The results show that the coating is helpful to improve wear resistance of titanium alloy.

HTML

Reference (13)

[1]	DING L X,WANG Y M.Wear resistant coating and performance of titaruum & titanium alloy[M].Shenyang:Northeastem University Press,2006:1(in Chinese).
[2]	WANG H M.Research progresa on laser surface modificationa of metallic materials and laaer rapid forming of high perfonnance metallic components[J].Acta Aeronautic et Astronautic Sinica,2002,23(5):473-478(in Clunese).
[3]	WANG H M,ZHANG L Y,LI A,et al.Rapid solidification laser processing and forming of advanced aeronautical metallic materials[J].Journal of Beijing University of Aeronautica and Astronautics,2004,30(10):962-967(in Chinese).
[4]	WANG H M,ZHANG L Y,LI A,et al.Progresa on rapid aoLidification laser processing for advanced materials and components[J].Wodd Sci-Tech R&D,2004,26(3):27-31(in Clunese).
[5]	XUE Y,WANG H M.Microstructure and wear properties of laser clad TiCo/Ti2 Co intermetallic coatings on titanium alloy[J].Applied Surface Science,2005,243(1):278-286.
[6]	HOFMANN H,FROMMEYER G,DERDER C.Creep mecluuusms in particle strengthened a-titanium-Ti2 Co alloys[J].Materials Science and Engineering,1998,A245(2):127-134.
[7]	HOFMANN H,FROMMEYER G,HERZOG W.Dislocation-creepcontrolled super plasticity at high strain ratea in the ultntfine-grained quasi-eutectoid Ti-10Co-4Al alloy[J].Materials Science and Engineering,1995,A203(1/2):128-133.
[8]	XUE Y,WANG H M.Microstructure and wear resistance of laser melted Ti5 So3:TiCo-Ti2 Co multiphaae intermetallic alloy[J].Rare Metal Materials and Engineering,2007,36(9):1623-1627(in Chineae).
[9]	WANG F,MEl J,JIANG H,et al.Laser fabrication of T16A14V/T1C compoaitea using simultaneous powder and wire feed[J].Materials Science and Engineering,2007,A445/446(1/2):461-466.
[10]	LIU D,ZHANG S Q,LI A,et al.Microstructure and tensile prop erties of laaer melting deposited TiC/TA15 titanium matrix compoaite[J].Jourual of Alloya and Compounds,2009,485(1/2):156-162.
[11]	WU W L,YANG D E zh,SUN R L.Microstructure of laser clad Ti+TiC powders on T16A14V alloy substrate[J].Laser Technology,2003,27(4):307-310(in Chinesc).
[12]	ZHANG S,ZHANG Ch H,WU W T,et al.An in situ formed TiC particle reinforcement composite coating induced by lases melting on surface of alloy Ti6A14V and its wearing performance[J].Acta Metallurgica Sinica,2001,37(3):315-320(in Chineae).
[13]	WANG W F,WANG M C,SUN F J.Morphological charscteristics and growth mechanism of in situ TiC in titanium-based coating formed by laaer cladding[J].Heat Treatment of Metals,2009,34(2):65-69(in Chinese).

Wear resistance of laser clad TiC/Ti-Ti2 Co coating on titanium alloy

Abstract

References

Proportional views

通讯作者: 陈斌, bchen63@163.com

Proportional views