Abstract
The transition region in worn surface of a 2.86 wt%Cr iron alloy was investigated under dry impact wear test, and apparatus consist of repeated impact of a pin specimen on a rotating grinding wheel with abrasive. Results show a convex surface is formed in transition region, and its altitude reaches maximum after 6000 impacts. That effect causes the thickness loss of entire worn surface declines from 22.34 μm of 0–2000 impacts to 18.87 μm of 4000–6000 impacts. However, the convex surface is replaced by a concave surface after 9000 impacts, and it propagates to region 2 subsequently. When the θ between concave morphology near region 2 and horizontal direction is greater than 90°, impact wear resistance starts to fail, and θ will not increase until worn surface splits away off completely. In addition, the resistance behavior above will restart on new worn surface.
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