Surface and Subsurface Deformation of Wear-Resistant Steels Exposed to Impact Wear

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• 作者：Vahid Rastegar (1)
  Anahita Karimi (2)
  
• 关键词：fragment embedment ; impact wear ; subsurface deformation ; wear ; resistant steels
• 刊名：Journal of Materials Engineering and Performance
• 出版年：2014
• 出版时间：March 2014
• 年：2014
• 卷：23
• 期：3
• 页码：927-936
• 全文大小：4,347 KB
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• 作者单位：Vahid Rastegar (1)
  Anahita Karimi (2)
  
  1. Department of Materials Science & Engineering, University of Connecticut, 191 Auditorium Rd, Storrs, CT, 06269-3139, USA
  2. Department of Chemistry & Biomolecular Science, Clarkson University, 8 Clarkson Ave, Potsdam, NY, 13699, USA
  
• ISSN：1544-1024

文摘

The impact wear resistance of four different wear-resistant steel grades was investigated using different impact bodies. Post-test evaluation of the impact tested samples was performed by different techniques including 3D surface profilometry, microhardness indentation, optical and scanning electron microscopy, and energy dispersive x-ray spectroscopy. The tribological response of the steel plates during the impact is strongly dependent on the properties of the impacting body. The subsurface deformation was found to increase with increasing impact energy and/or impact velocity and decreasing steel hardness. On a microscopic scale, a number of interesting mechanisms were revealed within the deformed impact sites. Besides an overall plastic deformation, localized deformation resulting in narrow adiabatic shear bands with an ultra-fine microstructure was observed. Within these shear bands, showing intense shearing strain, nucleation of microvoids was frequently observed. Growth and linkage of these voids lead in crack formation along the shear bands and eventually flake-like wear fragments are detached when these cracks reach the surface.