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Microstructure and Wear Performance of Cobalt-Containing Iron-Based Slag-Free Self-shielded Flux-Cored Wire

  • Dashuang LiuEmail author
  • Weimin Long
  • Mingfang Wu
  • Leijun Li
  • Jiayou Wang
  • Yu Zhang
Article
  • 34 Downloads

Abstract

A new type of cobalt-containing iron-based slag-free self-shielded flux-cored wire was developed for hardfacing. The influence of cobalt additions on the microstructure and wear performance of the hardfacing was investigated. The cobalt-containing iron-based hardfacing alloy has a typical hypereutectic microstructure consisting of primary M7(C, B)3 carbide, and a eutectic of M3(C, B) carbide and austenite (part of which subsequently transformed into martensite). Cobalt promoted the formation of austenite and changed the morphology of the primary carbide and eutectic colonies. The morphology of primary carbide became fragmented with increasing cobalt due to the possible impeding effect of cobalt to the movement of the M7(C, B)3/liquid interface. Different structures of the eutectic carbides were observed—the chrysanthemum structure for 1.42 wt.% cobalt, the skeleton form for 2.88 wt.% cobalt, the radial stripe 4.37 wt.% cobalt and the discrete stripe for 5.75 wt.% cobalt. Wear loss of the hardfacing alloy containing 2.88 wt.% cobalt was the smallest among all the alloys, owing to the large primary large carbide and skeleton-shaped eutectic carbides, the proper amount of austenite phase separating the M7(C, B)3 and M3(C, B) carbides, the solid solution strengthening by cobalt in the matrix, and the high hardness of the alloy. Moreover, the wear resistance has a tendency to decrease with the increase in velocity as well as load.

Keywords

cobalt-containing iron-based self-shielded flux-cored wire microstructure wear resistance 

Notes

Acknowledgments

This work was supported in part by Funding of China Postdoctoral Science Foundation Funded Project (Grant No. 2016M601753), the Open Project Program of the State Key Laboratory of Advanced Brazing Filler Metals and Technology (SKLABFMT-2017-03), the Central Plains Scholar Project of Henan Province (172101510003), National Natural Science Foundation of China (Grant No. 51405208) and Jiangsu Government Scholarship for Overseas Studies (Grant No. JS-2016-133).

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Copyright information

© ASM International 2019

Authors and Affiliations

  • Dashuang Liu
    • 1
    • 2
    • 4
    Email author
  • Weimin Long
    • 2
  • Mingfang Wu
    • 1
  • Leijun Li
    • 4
  • Jiayou Wang
    • 1
  • Yu Zhang
    • 3
  1. 1.School of Material Science and EngineeringJiangsu University of Science and TechnologyZhenjiangChina
  2. 2.Zhengzhou Research Institute of Mechanical Engineering Co., Ltd.ZhengzhouChina
  3. 3.Institute of Research of Iron and SteelSha-steelZhangjiagangChina
  4. 4.Department of Chemical and Materials EngineeringUniversity of AlbertaEdmontonCanada

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