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首页> 外文会议>Leeds-Lyon Symposium on Tribology; 19990914-17; Leeds(GB) >Surface fatigue resistance of tool steel coated with thin brittle PVD layers
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Surface fatigue resistance of tool steel coated with thin brittle PVD layers

机译：涂有薄脆性PVD层的工具钢的表面疲劳强度

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摘要

Surface fatigue properties of tool steel with different PVD coatings have been measured in lubricated rolling contact fatigue (RCF) configuration. The following coatings have been studied: TiN, TiAlN/TiN,TiCN and WC/C. All coatings have been deposited on tool steel by means of Physical Vapour Deposition. The thickness is about 5 μm. The influence of substrate pre treatment and substrate hardness have been investigated. Two values of hardness have been incorporated: 50 HRC and 60 HRC. Three pre treatments have been taken: polishing R_a = 0.03 μm, grinding R_a = 0.10 μm and polishing R_a = 0.15 μm. The initiation and growth of surface fatigue damage have been studied by Scanning Electron Microscopy and spectroscopy techniques. The kind of pre treatment has a strong influence on surface fatigue life time. For polished substrates (R_a = 0.03 μm) best results have been obtained for TiCN. For ground substrates (R_a = 0.10 μm) best results have been obtained for TiAlN/TiN. The damage mechanisms of TiN and WC/C are completely different.
机译：具有不同PVD涂层的工具钢的表面疲劳性能已通过润滑滚动接触疲劳（RCF）配置进行了测量。研究了以下涂层：TiN，TiAlN / TiN，TiCN和WC / C。所有涂层都通过物理气相沉积法沉积在工具钢上。厚度为约5μm。研究了基材预处理和基材硬度的影响。合并了两个硬度值：50 HRC和60 HRC。已经进行了三种预处理：抛光R_a = 0.03μm，研磨R_a = 0.10μm和抛光R_a = 0.15μm。表面疲劳损伤的产生和增长已通过扫描电子显微镜和光谱技术进行了研究。预处理的种类对表面疲劳寿命有很大影响。对于抛光的基材（R_a = 0.03μm），TiCN已获得最佳结果。对于研磨的基材（R_a = 0.10μm），TiAlN / TiN的最佳结果。 TiN和WC / C的破坏机理完全不同。

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