J. Mater. Sci. Technol. ›› 2024, Vol. 177: 246-255.DOI: 10.1016/j.jmst.2023.07.062

• Research article • Previous Articles     Next Articles

The Kirkendall effect on erosion resistance of chrome-coated 25Cr3Mo2WNiV and 30SiMn2MoV gun barrel steels

C.H. Doua, P.F. Jina, C.Z. Wanga, J.J. Lia, C. Zhangb, J.F. Huanga,*, C. Zhanga,*   

  1. aKey Laboratory for Advanced Materials Processing State, State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;
    bNational Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials, School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China
  • Received:2023-04-25 Revised:2023-06-13 Accepted:2023-07-04 Published:2024-04-01 Online:2024-03-25
  • Contact: *E-mail addresses: huangjf@ustb.edu.cn (J.F. Huang), zhangcheng@ustb.edu.cn (C. Zhang)

Abstract: This study aimed to investigate the erosion behavior and mechanism of a newly developed 25Cr3Mo2WNiV steel with a chrome coating using promoted ignition combustion tests. The erosion threshold pressure and temperature of the chrome-coated 25Cr3Mo2WNiV steel were determined to be 0.2 MPa and 254.3 K higher than those of traditional chrome-coated 30SiMn2MoV steel. Furthermore, Kirkendall voids and inter-diffusion between the Cr coating and matrix were first observed before erosion. The improved erosion resistance of the chrome-coated 25Cr3Mo2WNiV steel was attributed to the suppression of the Kirkendall effect, which minimized heat generation at the Cr/matrix interface by preventing oxygen diffusion and reducing oxygen affinity.

Key words: Erosion resistance, Kirkendall effect, Cr coating, Gun steel