Microstructure and cavitation erosion behavior of WC-Co-Cr coating on 1Cr18Ni9Ti stainless steel by HVOF thermal spraying

Yuping Wu, Sheng Hong, Jianfeng Zhang, Zhihua He, Wenmin Guo, Qian Wang, Gaiye Li

    Research output: Contribution to journalArticlepeer-review

    61 Citations (Scopus)

    Abstract

    A WC-Co-Cr coating was deposited by a high velocity oxy-fuel thermal spray (HVOF) onto a 1Cr18Ni9Ti stainless steel substrate to increase its cavitation erosion resistance. After the HVOF process, it was revealed that the amorphous phase, nanocrystalline grains (Co-Cr) and several kinds of carbides, including Co 3W 3C, Co 6W 6C, WC, Cr 23C 6, and Cr 3C 2 were present in the coating. The hardness of the coating was improved to be 11.3 GPa, about 6 times higher than that of the stainless steel substrate, 1.8 GPa. Due to the presence of those new phases in the as-sprayed coating and its higher hardness, the cavitation erosion mass loss eroded for 30 h was only 64% that of the stainless steel substrate. The microstructural analysis of the coating after the cavitation erosion tests indicated that most of the corruptions took place at the interface between the un-melted or half-melted particles and the matrix (Co-Cr), the edge of the pores in the coating, and the boundary of the twin and the grain in the stainless steel 1Cr18Ni9Ti.

    Original languageEnglish
    Pages (from-to)21-26
    Number of pages6
    JournalInternational Journal of Refractory Metals and Hard Materials
    Volume32
    DOIs
    Publication statusPublished - 2012 May

    Keywords

    • Cavitation erosion
    • HVOF thermal spray
    • WC-Co-Cr coating

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

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