ENHANCING ADHESION STRENGTH AND WEAR PERFORMANCE OF ALCRN COATING ON COOL-WORK TOOL STEEL THROUGH INTRODUCING CRNX ADHESION LAYER

Hui Xiao (), Xianna Meng (), Bingyue Nie (), Haiyan Kang (), Cong Li and Yi Wang ()
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Hui Xiao: School of Mechatronics Engineering and Automation, Foshan University, Foshan 528001, China
Xianna Meng: School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510006, China
Bingyue Nie: School of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410114, China
Haiyan Kang: School of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410114, China
Cong Li: School of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410114, China
Yi Wang: Department of Mechanical and Electronic Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China

Surface Review and Letters (SRL), 2021, vol. 28, issue 09, 1-10

Abstract: Hard thin coating directly deposited on soft steel substrate often suffers low adhesion strength and load-bearing capacity. In this work, CrNx-type adhesion layers (ALs) were introduced between hard AlCrN coating and soft cool-work tool steel substrate to enhance the adhesion strength and wear performance. The microstructure of CrNx ALs prepared with different nitrogen pressure and its influence on adhesion strength and tribological properties were investigated. The results show that with the nitrogen pressure increase from 0.5 Pa to 3.0 Pa, the phase transformation sequences occurring in ALs are: Cr + Cr2N → Cr2N + CrN → CrN. The adhesion strength increases with the increase of nitrogen pressure due to the formation of CrN which provides better load support resistance than the fragile Cr2N and soft Cr. In addition, the adhesion strength of the samples with ALs is always higher than that of the one without ALs. The improvement of adhesion strength for samples with CrNx-type ALs is beneficial for improving wear resistance, especially at high wearing loads.

Keywords: Arc ion plating; AlCrN coating; adhesion strength; wear behavior (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1142/S0218625X21500797

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