高速钢表面<strong>TiN</strong>薄膜的界面疲劳剥落行为

doi:10.11900/0412.1961.2020.00315

金属学报

2021, Vol. 57

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

研究论文

本期目录 | 过刊浏览

高速钢表面TiN薄膜的界面疲劳剥落行为

邱龙时¹^,², 赵婧¹, 潘晓龙¹(

), 田丰¹

^1.西安稀有金属材料研究院有限公司西安 710016
^2.西安交通大学金属材料强度国家重点实验室西安 710049

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

引用本文:

邱龙时, 赵婧, 潘晓龙, 田丰. 高速钢表面TiN薄膜的界面疲劳剥落行为[J]. 金属学报, 2021, 57(8): 1039-1047.
Longshi QIU, Jing ZHAO, Xiaolong PAN, Feng TIAN. Interfacial Fatigue Spalling Behavior of TiN Films on High Speed Steel[J]. Acta Metall Sin, 2021, 57(8): 1039-1047.

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摘要:

采用多弧离子镀技术在M2高速钢(W6Mo5Cr4V2)表面制备TiN薄膜，利用滚动接触疲劳法对薄膜界面疲劳行为开展研究。结果表明，界面疲劳失效主要表现形式为薄膜剥落，疲劳裂纹最先萌生于膜/基界面，经一定周次后向薄膜表面偏折，最终造成薄膜剥落。界面最大剪切应力幅(Δτ_inter)是控制界面裂纹萌生和扩展的主要力学参量，通过Δτ_inter和临界疲劳周次(N)构建的评价模型可有效用于薄膜界面疲劳性能表征和寿命预估。界面疲劳性能与膜/基界面状态密切相关，利用Δτ_inter-N评价模型可有效辨别界面状态间的差异，采用辉光清洗或预制金属打底层等预处理方式均能有效提升界面抗疲劳剥落性能。选取薄膜剥落面积比为5%和50%，以及失效概率为30%、60%和90%比较发现，薄膜剥落面积比和失效概率值大小的选取不影响膜/基界面疲劳性能的判定。研究结果为镀膜轴承等零部件的疲劳性能表征和寿命预估提供了重要理论参考。

关键词 ：气相沉积, 硬质薄膜, 滚动接触, 界面疲劳, 剥落

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

收稿日期: 2020-08-19

ZTFLH:

TG172.44

基金资助:陕西省自然科学基础研究计划项目(2020JQ-924);西安市博士后创新基地项目

作者简介: 邱龙时，男，1988年生，博士

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表1 TiN薄膜制备参数及力学性能

图1 滚动接触疲劳试验机示意图(a) loading unit image(b) working mechanism of loading unit(c) loading rendering

图2 TiN薄膜表面和截面SEM像

图3 TiN薄膜的滚动接触疲劳失效形貌的SEM像及EDS分析(a) surface morphology (b) cross section morphology of none peeling area (c) EDS analysis

图4 TiN薄膜滚动接触失效区形貌和轮廓(a) surface OM image (b) 3D surface morphology (c) cross section profile along the line in Fig.4a

图5 TiN薄膜界面裂纹扩展过程(a) the crack extends along the interface (b) the crack deflects towards the surface

图6 界面疲劳剥落机制图

图7 滚动接触下应力分布情况

图8 不同失效面积比对S-N曲线的影响

表2 不同外载下TiN薄膜的寿命参数

表3 不同失效概率下S-N曲线参数

图9 不同失效概率下TiN薄膜的S-N曲线

图10 不同界面状态对TiN薄膜界面疲劳性能的影响

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