Synchronous Shot Peening Applied on HVOF for Improvement on Wear Resistance of Fe-based Amorphous Coating

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.

Crystalline ytterbium disilicate environmental barrier coatings made by high velocity oxygen fuel spraying

“…Therefore, it can be assumed that the stresses continue to build up with each pass of deposition and are eventually relaxed by crack initiation. This effect is amplified by the fact that the strain tolerance of the layers progressively decreases with decreasing porosity 21, 22 . This corresponds well to the observation of macroscopic spallation at conditions where highest particle velocity and lowest coating porosity coincide (Figure 5A).…”

“…This effect is amplified by the fact that the strain tolerance of the layers progressively decreases with decreasing porosity. 21,22 This corresponds well to the observation of macroscopic spallation at conditions where highest particle velocity and lowest coating porosity coincide (Figure 5A).…”

Effect of High-Energy Shot Peening on Properties of High-Velocity Oxygen-Fuel Spraying

“…After high-energy shot peening, a strengthened layer with a certain depth is formed on the surface of the coating, and the hardness is high. Some studies have shown that there is a residual compressive stress layer with a certain depth in the coating after shot peening [35][36][37]. According to the Archard equation [38], the relationship between hardness (H) and wear rate (W) is shown in Equation (2):…”

Optimasi Parameter Gravitasi Shot Peening Terhadap Kekasaran, Kekerasan dan Struktur Mikro ST 45 dengan Metode Taguchi

“…Parameter proses shot peening dengan variasi seperti jarak, waktu proses, tekanan, jarak penembakan, bola baja, sudut penembakan dan faktor lainnya menunjukan pengaruh terhadap peningkatan sifat mekanik [3], meningkatkan ketahanan terhadap keausan [4], dan kekerasan meningkat signifikan, [5].…”