Microstructural Evolution of NiCrBSi Coatings Fabricated by Stationary Local Induction Cladding

  • Xuliang Chen
  • Xunpeng Qin
  • Kai Gao
  • Zhenhua Zhu
  • Feng Huang
Article
  • 11 Downloads

Abstract

The development of induction cladding has been restricted by the complicated geometric characteristics of workpieces and the large heat-affected zone in the cladded workpieces. In this paper, three-dimensional continual local induction cladding (3D-CLIC) was proposed as a potential process to clad coating over a substrate with curved surface, and a stationary local induction cladding (SLIC) experiment was conducted as an exploratory study of 3D-CLIC. The microstructures and microhardness in the coatings were measured by SEM, EDS, XRD and microsclerometer, respectively. The results indicate that the coating is metallurgically bonded with the substrate without any defects. A compositional gradient exists in the diffusion transfer belt (DTB), and it decreases with the increase in induction heating time. The coating is mainly composed of (Fe, Ni), CrB, M7C3, Ni3B, Ni3Si and M23C6 (M = Cr, Ni, Fe). Among the carbides, M7C3 presents several morphologies and M23C6 is always attached to the DTB. A special phenomenon of texture was found in the SLIC coatings. The preferred orientation in (200) crystal plane or the restrained orientation in (111) (200) crystal plane becomes more obvious as the scanning speed increases. The maximum average microhardness is 721 HV when the coating is heated for 5 s. The wear loss of different samples increases with increasing induction heating time. The longer heating time would result in higher dilution in the SLIC coatings due to the complete mixing with the substrate, thus leading to the decrease in microhardness and wear loss.

Keywords

cladding microstructure NiCrBSi texture wear loss 

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Copyright information

© ASM International 2018

Authors and Affiliations

  • Xuliang Chen
    • 1
    • 2
  • Xunpeng Qin
    • 1
    • 2
  • Kai Gao
    • 1
    • 2
  • Zhenhua Zhu
    • 1
    • 2
  • Feng Huang
    • 1
    • 2
  1. 1.Hubei Key Laboratory of Advanced Technology for Automotive ComponentsWuhan University of TechnologyWuhanChina
  2. 2.Hubei Collaborative Innovation Center for Automotive Components TechnologyWuhan University of TechnologyWuhanChina

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