AlTiN涂层合金划痕测试的失效形式及其失效机理的有限元分析

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Abstract To explore the synergistic effect of the hard phase and the ductile binder phase in cemented carbide substrates to the coating, WC-10Co-0.65Cr₃C₂-0.35VC (10Co) with hard phase + binder phase structure, WC-6Mo₂C-0.68Cr₃C₂- 0.37VC (bWC) and 85.1Co-9.2W-4.7Cr₃C₂-1.0VC (CoW) alloys were prepared. Al_0.55Ti_0.45N coating around 5 μm in thickness was deposited by direct current magnetron sputtering technology. The failure modes of AlTiN coated alloys during scratch test were determined by the magnitude of critical loads L_C1and L_C2 and the difference value between L_C1and L_C2. L_C1 and L_C2are the characterization parameters of the cohesive failure resistance of the film and the adhesion strength between the film and the substrate, respectively. The related failure mechanism was investigated by finite element analysis of the stress distribution in the coating during scratch test. Further, the effects of the WC grain size and the cobalt content in the cemented carbide substrates on the stress distribution in the coating during scratch test were also investigated. The results show that the coated alloy with ductile CoW substrate has the lowest value of L_C1and L_C2. The coated alloy with hard bWC substrate has the highest L_C2 and the highest difference value between L_C1and L_C2. The coated 10Co alloy has the highest L_C1 and the lowest L_C1and L_C2 difference. The young modulus ratio of the film and the substrate and the hardness of substrate are the key factors affecting L_C1and L_C2. Decreasing the grain size and choosing moderate cobalt content in cemented carbide substrate facilitate the synchronous improvement of L_C1and L_C2.

Key words： AlTiN coating substrate material scratch test finite element analysis coating failure mode coated cemented carbide design

Received: 22 March 2018 Published: 12 July 2019

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	Articles by authors
	ZHANG Huadong
	ZHANG Li
	CHEN Yi
	LUO Guokai
	XIAO Qiaoping
	ZHONG Zhiqiang

Cite this article:

ZHANG Huadong,ZHANG Li,CHEN Yi, et al. Failure modes of AlTiN coated alloys during scratch test and the related mechanism by finite element analysis[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(5): 445-453.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2018/V23/I5/445

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