Interfacial Fatigue Spalling Behavior of TiN Films on High Speed Steel

doi:10.11900/0412.1961.2020.00315

Acta Metall Sin

2021, Vol. 57

Issue (8): 1039-1047 DOI: 10.11900/0412.1961.2020.00315

Research paper

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Interfacial Fatigue Spalling Behavior of TiN Films on High Speed Steel

QIU Longshi¹^,², ZHAO Jing¹, PAN Xiaolong¹(

), TIAN Feng¹

^1.Xi'an Rare Metal Materials Institute Co. , Ltd. , Xi'an 710016, China
^2.State-Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China

Cite this article:

QIU Longshi, ZHAO Jing, PAN Xiaolong, TIAN Feng. Interfacial Fatigue Spalling Behavior of TiN Films on High Speed Steel. Acta Metall Sin, 2021, 57(8): 1039-1047.

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Abstract

Performance and fatigue life of coating parts are seriously restricted by their interfacial fatigue property. Herein, TiN films were deposited on W6Mo5Cr4V2 steel substrates by multiarc ion plating. The interfacial fatigue failure mechanisms were studied by the rolling contact fatigue method. The results show that the interfacial fatigue failure mode is mainly film spalling. The fatigue cracks generated initially at the film/substrate interface proceed to the surface, resulting in film spalling. The interfacial maximum shear stress amplitude (Δτ_inter) is a key factor for controlling interfacial crack initiation and propagation. The evolution model built using Δτ_inter and critical cycles (N) can be used to determine interfacial fatigue performance and for life forecast. The interfacial fatigue property is determined using a film/substrate interface, and glow discharge cleaning and prefabricated metal layer before coating deposition can improve interface fatigue performance. The evaluation model based on Δτ_inter-N curves can effectively used to identify the differences in interface states. Selection of the film-spalling area ratios of 5% and 50% and failure probabilities of 30%, 60%, and 90% have little effect on the determination of film/substrate interfacial fatigue performance. The results provide important theoretical references for fatigue performance determination and lifespan prediction of coated bearings and other parts.

Key words: vapor deposition hard film rolling contact interfacial fatigue spalling

Received: 19 August 2020

ZTFLH:

TG172.44

Fund: Natural Science Basic Research Program of Shaanxi Province(2020JQ-924);Xi'an Postdoctoral Innovation Base Research Project

About author: PAN Xiaolong, senior engineer, Tel: (029)86258754, E-mail: 919516928@qq.com

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	Longshi QIU
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https://www.ams.org.cn/EN/10.11900/0412.1961.2020.00315 OR https://www.ams.org.cn/EN/Y2021/V57/I8/1039

Table 1 Preparation parameters and mechanical properties of TiN films

Fig.1 The structure diagrams of rolling contact fatigue tester (r—radius, F—load)

Fig.2 Surface (a) and cross section (b) SEM images of TiN films (t = 1.6 μm)

Fig.3 SEM images and EDS analysis of the rolling contact fatigue (RCF) failure of TiN films (t = 1.6 μm)

Fig.4 The morphology and section profile of rolling contact failure zone of TiN films

Fig.5 Interfacial crack propagation of TiN films

Fig.6 The mechanism diagram of interfacial fatigue spalling

Fig.7 The stress distribution under the rolling contact conditions (S₁₂—shear stress; S_{Max. Principal}—maximum principal stress)(a) shear stress(b) maximum principal stress

Fig.8 Effects of failure area ratio on S-N curves (S-5%—spalling area ratio 5%, S-50%—spalling area ratio 50%, N—fatigue spalling cycles)

Table 2 The fatigue life parameters of TiN films under different external loads

Table 3 The S-N curve parameters with different failure probabilities

Fig.9 The S-N curves of TiN films with different failure probabilities

Fig.10 Effects of interfacial states on interfacial fatigue properties (t = 3.7 μm)

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