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{sub}a = 0.03 μm, grinding R{sub}a = 0.10μm and polishing R{sub}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{sub}a = 0.03 μm) best results have been obtained for TiCN. For ground substrates (R{sub}a = 0.10 μm) best results have been obtained for TiAlN/TiN. The damage mechanisms of TiN and WC/C are completely different.
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机译：用不同的PVD涂层的刀具钢的表面疲劳性能在润滑轧辊接触疲劳（RCF）构型中测量。研究了以下涂层：锡，TiAlN / TiN，TiCN和WC / C.通过物理气相沉积沉积所有涂层。厚度为约5μm。已经研究了衬底预处理和衬底硬度的影响。已经纳入了两个硬度值：50 hrc和60 hrc。已经采取了三种预处理：抛光R {Sub} A =0.03μm，研磨R {Sub} A =0.10μm，抛光R {Sub} A =0.15μm。通过扫描电子显微镜和光谱技术研究了表面疲劳损坏的起始和生长。这种预处理对表面疲劳寿命的强烈影响。对于抛光的基板（R {Sub} A =0.03μm），已经获得了最佳结果，用于TICN。对于地面基材（R {Sub} A =0.10μm），已经获得了TiAln / TiN的最佳结果。锡和WC / C的损伤机制是完全不同的。
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