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Interdependence of slurry erosion wear performance and residual stress in WC-12wt%Co and WC-10wt%VC-12wt%Co HVOF coatings
International Journal of Refractory Metals & Hard Materials ( IF 3.6 ) Pub Date : 2019-10-25 , DOI: 10.1016/j.ijrmhm.2019.105101
Andrew M. Venter , Vladimir Luzin , Deon Marais , Natasha Sacks , Enoch N. Ogunmuyiwa , Phil H. Shipway

High-velocity-oxygen-fuel deposited WC-12wt%Co and WC-10wt%VC-12wt%Co hardmetal coatings are well anchored to the mild steel substrates, giving good mechanical integrity, as well as low porosity. The mechanical integrity has been investigated in terms of erosion performance and its influence on the residual stress state in the eroded regions. Wear slurry erosion tests reveal similar rates of erosion for both systems, that becomes more severe as the impact angle increases due to higher direct impact deformation normal to the surface. The 10wt%VC-12wt%Co coating renders slightly better erosion performance throughout. Stress evaluations using X-ray and neutron diffraction reveal substantial compressive residual stresses in the WC-phases for both coating compositions in their as-coated conditions. Within their erosion scars, the stresses become more compressive with erosion angle due to the increased impact component normal to the surface. It is concluded that the better wear performance of the WC-10wt%VC-12wt%Co coatings with impact angle, correlates with larger induced in-plane compressive stresses in the WC phase.



中文翻译:

WC-12wt%Co和WC-10wt%VC-12wt%Co HVOF涂料中浆料侵蚀磨损性能和残余应力的相互关系

高速氧气燃料沉积的WC-12wt%Co和WC-10wt%VC-12wt%Co硬质合金涂层很好地固定在低碳钢基材上,具有良好的机械完整性和低孔隙率。已根据腐蚀性能及其对腐蚀区域中残余应力状态的影响研究了机械完整性。磨损浆液腐蚀测试表明,两种系统的腐蚀速率相似,由于垂直于表面的较高直接冲击变形会随着冲击角的增加而变得更加严重。10wt%VC-12wt%Co涂层在整个过程中呈现出略微更好的腐蚀性能。使用X射线和中子衍射进行的应力评估显示,两种涂料组合物在其涂覆后的状态下,在WC相中存在很大的压缩残余应力。在他们的侵蚀疤痕中,由于垂直于表面的冲击分量增加,应力随冲蚀角而变得更具压缩性。结论是,具有冲击角的WC-10wt%VC-12wt%Co涂层具有更好的耐磨性能,与WC相中较大的面内压缩应力有关。

更新日期:2019-10-25
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