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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
全文: PDF(10898 KB)   HTML
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(Δτinter)是控制界面裂纹萌生和扩展的主要力学参量,通过Δτinter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Δτinter-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 (Δτinter) is a key factor for controlling interfacial crack initiation and propagation. The evolution model built using Δτinter 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 Δτinter-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 wordsvapor 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
通讯作者: 潘晓龙     E-mail: 919516928@qq.com
Corresponding author: PAN Xiaolong     E-mail: 919516928@qq.com
作者简介: 邱龙时,男,1988年生,博士

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. Acta Metall Sin, 2021, 57(8): 1039-1047.

链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2020.00315      或      https://www.ams.org.cn/CN/Y2021/V57/I8/1039

Filmt / μmInterfacial stateLc / NPc / NHv / GPa
TiN1.6GD-20 min + Ti*-10 min> 100> 100024.5 ± 0.5
TiN3.7GD-5 min + Ti*-0 min3040024.0 ± 0.7
TiN3.7GD-10 min + Ti*-5 min90100023.8 ± 0.8
TiN3.7GD-20 min + Ti*-10 min> 100> 100024.7 ± 0.4
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

F

N

Δτinter

GPa

L30

106 cyc

L60

106 cyc

L90

106 cyc

200.9680.3150.5580.825
251.0300.2350.4160.636
301.1250.1980.3200.475
351.2080.1750.2870.398
表2  不同外载下TiN薄膜的寿命参数
PCm
30% (L30)0.274.72
60% (L60)0.484.68
90% (L90)0.724.16
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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