Abstract
Shot peening was used synchronously to improve Fe-based amorphous coating performance by delivering ZrO2 ceramic particles into a low-temperature region of a flame during the high velocity oxygen flame (HVOF) spray process. The coating became denser, and its hardness became higher via the new process. Moreover, the compressive residual stress was induced by shot peening. The results from the dry friction test indicated that the coating’s wear resistance was enhanced obviously. The wear mechanism of coatings with and without shot peening is an abrasive wear combined with an oxidation wear at wear test conditions of a low load and a low frequency. The coating with the best wear resistance did not have the strongest microhardness but had the highest compressive residual stress. The compressive residual stress had a significant positive influence on the wear resistance at a low frequency, while its effect is weakened at a high frequency.
Highlights
Fe-based amorphous alloys have been studied extensively due to high hardness, good wear and corrosion resistance, and relatively low cost
This study provides an effective method to improve the wear resistances of Fe-based amorphous coatings
It can be seen that the residual stress changed from the residual tensile stress (4 MPa) to the compressive residual stress
Summary
Fe-based amorphous alloys have been studied extensively due to high hardness, good wear and corrosion resistance, and relatively low cost. For improvement on Fe-based amorphous coatings performance, different kinds of methods were developed such as technology improvement [3], parameter optimization [4], hard phase reinforcement [5], and pre/post-treatment [6,7]. Shot peening in the post-treatment is in favor of wear resistance and compressive residual stress, but the sphere of influence is limited [22,24]. Oxidation was introduced by high-pressure air, and high cost was caused by an inert gas Another method for synchronization of spraying and peening is to mix hard particles into sprayed particles, where hard particles have effects on shot peening. This study provides an effective method to improve the wear resistances of Fe-based amorphous coatings
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