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首页> 外文期刊>Materials and Manufacturing Processes >Effect of Grinding on the Residual Stress and Adhesion Strength of HVOF Thermally Sprayed WC-10Co-4Cr Coating
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Effect of Grinding on the Residual Stress and Adhesion Strength of HVOF Thermally Sprayed WC-10Co-4Cr Coating

机译：磨削对HVOF热喷涂WC-10Co-4Cr涂层残余应力和附着强度的影响

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摘要

In carbide cermet coatings, such as WC-Co-Cr, the surface roughness of the sprayed workpiece is much more than the acceptable values for various industrial demands. Thus, the surface of the carbide cermet coatings is to be ground appropriately to obtain suitable surface finish. However, the grinding may change the properties of coating. In this study, effects of the grinding process on the porosity content, residual stress, microhardness, and adhesion and cohesion strength of the high-velocity oxy-fuel WC-10Co-4Cr coatings are investigated. For this purpose, the grinding experiments have been performed on a surface grinder using a diamond wheel (resin bond) under different grinding parameters, such as table feed rate, cutting speed, and depth of cut. The investigations of residual stress state and adhesion properties were carried out using the X-ray diffraction and interfacial indentation test methods, respectively. The results indicated that the coating's porosity content increased after grinding due to the mechanical loading of coating by diamond grits of the grinding wheel. On the other hand, adhesion and cohesion strength and microhardness of the coating were improved after grinding. This can be interpreted by the residual stress state of the coating samples.
机译：在诸如WC-Co-Cr的硬质合金陶瓷涂层中，喷涂工件的表面粗糙度远远超过各种工业需求的可接受值。因此，要适当地研磨碳化物金属陶瓷涂层的表面以获得合适的表面光洁度。但是，研磨可能会改变涂层的性能。在这项研究中，研究了研磨过程对高速含氧燃料WC-10Co-4Cr涂层的孔隙率，残余应力，显微硬度以及附着力和内聚强度的影响。为此，已经在使用金刚石砂轮（树脂结合剂）的平面磨床上以不同的磨削参数（例如工作台进给速度，切削速度和切削深度）进行了磨削实验。分别使用X射线衍射和界面压痕测试方法对残余应力状态和粘附性能进行了研究。结果表明，磨削后涂层的孔隙率增加是由于砂轮的金刚石磨粒对涂层的机械负载。另一方面，研磨后涂层的粘附力和内聚强度以及显微硬度得到改善。这可以通过涂层样品的残余应力状态来解释。

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