TY - GEN
T1 - Microstructure and wear properties of laser clad TiN/Co-based composite coating
AU - Zhou, Jun
AU - Xie, Faqin
AU - Li, Yongquan
AU - Wu, Xiangqing
PY - 2010
Y1 - 2010
N2 - Co-based composite coatings reinforced by TiN particles were fabricated on Ni-based superalloy substrate by using a 5 kW CO2 laser. The microstructures and phases constitution of the composite coating were studied by means of optical microscope (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). The microhardness and wear resistance of the coating were also examined. The results showed that the composite coating was mainly composed of γ-Co, TiN, TiC, (Cr, W)23C6 and Co 3Ti. And different solidification morphologies, such as planar, cellular and dendrite, were obtained. Structural transformations were attributed to the temperature gradient and solidification rate in metal-melting region. It was found that the microhardness of the composite coating was enhanced prominently as compared to the substrate region, which should be due to the undissolved TiN and other new complicated phase. Friction and wear tests without lubrication showed that the addition of TiN particles into Co-based coating can improve its wear resistance significantly without evidently increasing the friction coefficient of coating.
AB - Co-based composite coatings reinforced by TiN particles were fabricated on Ni-based superalloy substrate by using a 5 kW CO2 laser. The microstructures and phases constitution of the composite coating were studied by means of optical microscope (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). The microhardness and wear resistance of the coating were also examined. The results showed that the composite coating was mainly composed of γ-Co, TiN, TiC, (Cr, W)23C6 and Co 3Ti. And different solidification morphologies, such as planar, cellular and dendrite, were obtained. Structural transformations were attributed to the temperature gradient and solidification rate in metal-melting region. It was found that the microhardness of the composite coating was enhanced prominently as compared to the substrate region, which should be due to the undissolved TiN and other new complicated phase. Friction and wear tests without lubrication showed that the addition of TiN particles into Co-based coating can improve its wear resistance significantly without evidently increasing the friction coefficient of coating.
KW - Co-based composite coating
KW - Laser cladding
KW - Microstructure
KW - TiN
KW - Wear resistance
UR - http://www.scopus.com/inward/record.url?scp=77950983452&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/AMR.97-101.1510
DO - 10.4028/www.scientific.net/AMR.97-101.1510
M3 - 会议稿件
AN - SCOPUS:77950983452
SN - 0878492801
SN - 9780878492800
T3 - Advanced Materials Research
SP - 1510
EP - 1513
BT - Manufacturing Science and Engineering I
T2 - 2009 International Conference on Manufacturing Science and Engineering, ICMSE 2009
Y2 - 26 December 2009 through 28 December 2009
ER -