›› 2012, Vol. 42 ›› Issue (04): 924-929.

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Friction and wear behavior of Ni-based WC composite coating on mould steel 2738 prepared by laser cladding

DAI Sheng1,2, ZUO Dun-wen1, LI Xiang-feng1, CHENG Hu2, FANG Zhi-gang2, WANG Min1, MIAO Hong1   

  1. 1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
    2. College of Mechanical Engineering, Taizhou University, Taizhou 318000, China
  • Received:2011-03-01 Online:2012-07-01 Published:2012-07-01

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Abstract: The Ni-based WC composite (Ni-WC) coating on mould steel 2738 was prepared by CO2 laser cladding. The substrate 2738 steel and the Ni-based WCCC were tested under dry sliding friction conditions to investigate their friction and wear behavior. The wear volume of specimen was measured using a 3-D surface profilometer, and the worn surface topography was observed by the scanning electronic microscopy. The results show that the microhardness of the Ni-WC coating was enhanced significantly, its surface hardness exceeded 1200 HV, ensuring its wear resistance. The average friction factor was about 0.25, it decreased by about 44% in comparison with that of the substrate 2738 steel of 0.43. WC hard phase enhanced the bearing capacity of the friction surface, reduced the wear rate by 96.7%. The abrasive wear was the main wear mechanism for the Ni-WC coating.

Key words: surface and interface of material, laser cladding, Ni-based WC composite coating, friction and wear behavior, mould steel 2738

CLC Number: 

  • TG174.44
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