Investigation of rolling contact fatigue lives of Fe–Cr alloy coatings under different loading conditions
Investigation of rolling contact fatigue lives of Fe–Cr alloy coatings under different loading conditions
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DOI：
10.1016/j.surfcoat.2009.09.035
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发表时间：
2010-01
影响因子：
5.4
通讯作者：
Piao Zhong-yu;Xu Bin-shi;Wang Haidou;Pu Chun-Huan
中科院分区：
文献类型：
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作者：
Piao Zhong-yu;Xu Bin-shi;Wang Haidou;Pu Chun-Huan
本研究的目的是解决滚动接触疲劳（RCF）寿命和行为的热喷涂涂层。采用等离子喷涂装置在钢基体上分别制备了Fe-Cr合金涂层和Ni-Al合金涂层。利用球盘试验机在四种载荷条件下进行了RCF试验。失效的涂层试样的磨损表面观察的基础上的失效机制进行了研究。采用威布尔分布图对Fe-Cr涂层的疲劳寿命进行了评估。结果表明，接触应力对Fe-Cr涂层的疲劳寿命和失效行为有明显的影响。随着接触应力的增加，寿命降低。同时涂层的主要失效形式由磨损剥落转变为分层。涂层的失效机理与涂层的微观缺陷、涂层的结合强度和涂层内部的正交剪切应力有关。根据RCF寿命数据，用统计方法得到的S-N曲线，对硬质涂层的设计有一定的指导意义。
The aim of the present study is to address the rolling contact fatigue (RCF) life and behavior of thermal sprayed coatings. The Fe–Cr alloy coatings and Ni–Al alloy coatings were prepared by a plasma spray device as the surface coating and undercoating on steel substrates, respectively. RCF tests were conducted using the ball-on-disc tester under four kinds of loading conditions. The failure mechanisms were investigated on the basis of worn surface observations of failed coated specimens. The RCF lives of Fe–Cr coatings were evaluated by means of Weibull distribution plots. The results show that the contact stress obviously influences the RCF life and failure behavior of the Fe–Cr coatings. The lives decreased as the contact stress increased. At the same time, the main failure modes of the coatings changed from abrasion and spalling to delamination. The failure mechanisms of coatings are associated with the micro-defects, the bond strength of the coatings and the orthogonal shear stress (OSS) within the coatings. The S–N curve, based on RCF life data by using statistical approach, is helpful for the design of hard coatings.