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篇目详细内容 |
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【篇名】 |
Durability of plasma-sprayed Cr3C2-NiCr coatings under rolling contact conditions |
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【刊名】 |
Frontiers of Mechanical Engineering (Formerly known as Frontiers of Mechanical Engineering in China) |
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【刊名缩写】 |
Front. Mech. Eng |
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【ISSN】 |
2095-0233 |
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【EISSN】 |
2095-0241 |
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【DOI】 |
10.1007/s11465-011-0127-0 |
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【出版社】 |
Higher Education Press and Springer-Verlag Berlin
Heidelberg |
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【出版年】 |
2011 |
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【卷期】 |
6
卷1期 |
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【页码】 |
118-135
页,共
18
页 |
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【作者】 |
Xiancheng ZHANG;
Fuzhen XUAN;
Shantung TU;
Binshi XU;
Yixiong WU;
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【关键词】 |
rolling contact fatigue; coating; Weibull distribution; failure mode; mechanism |
【摘要】 |
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The aim of this paper was to address the rolling contact fatigue (RCF) failure mechanisms of plasma-sprayed Cr3C2-NiCr coatings under different tribological conditions of contact stress. Weibull distribution plots of fatigue lives of the coated specimens at different contact stresses were obtained. The failure modes of coatings were identified on the basis of wore surface observations of the failed coatings. Results showed that the RCF failure modes can be classified into four main categories, i.e., surface abrasion, spalling, cohesive delamination, and interfacial delamination. The probabilities of the surface abrasion and spalling type failures were relatively high at low contact stress. When the coatings were subjected to abrasion and spalling type failures, the failure of the coating was depended on the microstrcture of the coating. The stress concentration near the micro-defects in the coating may be the may reason for the formation of spall. The coatings were prone to fail in delamination under higher contact stresses. However, the delamination of coating may be related to distribution of shear stress amplitude within coating. The location of maximum shear stress amplitude can be used as a key parameter to predict the initiation of subsurface cracks within coating in rolling contact. |
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