Discussion on the Mechanism of Creating a Transferred Layer of SiC Shot Particles on Aluminum Alloy by FPP Treatment

Basic mechanisms of generating a surface modified layer formed by a previously developed atmospheric controlled IH FPP system, consisting of induction heating system and fine particle peening system, were investigated. Three types of specimen treated at 900°C in argon with Cr, Al 2 O 3 and Cu shot particles were prepared. Surface microstructures of the treated commercial grade pure iron were characterized with a scanning electron microscope (SEM), an energy dispersive X ray spectrometer (EDX) and an X ray diffraction analysis (XRD). When treatment was carried out using Cr particles, the transferred layer and the diffused layer of the shot particle element formed at the treated surface. This was because the radius of Cr atom was almost the same as that of the Fe, thus forming a solid solution in the substrate. Conversely, when the treatment was applied using chemically stable Al 2 O 3 particles, a transferred layer only was observed. In the case of Cu particles, adhesion occurred due to the low melting temperature of Cu particles, resulting in the formation of a thick adhesive layer such as that generated by thermal spraying. These results suggest that the characteristics of the modified layer, generated by the atmospheric controlled IH FPP treatment system, can be controlled by varying the shot particles and other processing parameters. (Received January 11, 2011; Accepted April 4, 2011) Keywords: surface modification, fine particle peening, induction heating, atmospheric control, induction heating fine particle peening (IH FPP) system

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Metal Silicide on the Steel Substrate Formed by Atmospheric Controlled IH-FPP (AIH-FPP) and Its Effect on Corrosion Resistance Improvement

雄高¹,

有規²,

潤³

et al. 2013

J. Japan Inst. Metals

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Metal silicides are potential materials because of their excellent properties such as corrosion resistance, oxidation resistance and wear resistance. In this study, the authors propose a new surface treatment process to form metal silicides on metallic materials by using an atmospheric controlled IH FPP. Atmospheric controlled IH FPP in which Si particles are bombarded to the substrate with an elevated temperature of 1173 K can form the iron silicide. Elevated temperature of the substrate enhances transfer of Si particles on the substrate, followed by mixing and/or diffusion into the substrate. This results in the formation of iron silicides. Atmospheric controlled IH FPP with Si Cr mixed particles also forms the iron silicide. Atmospheric controlled IH FPP with the mixed particles followed by annealing of 873 K for 3600 s forms chromium silicide in accordance with Fe Cr Si ternary phase diagram. Carbon steel materials covered with the silicide layer exhibit better corrosion resistance since SiO 2 is formed on the silicide.

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Discussion on the Mechanism of Creating a Transferred Layer of SiC Shot Particles on Aluminum Alloy by FPP Treatment

Cited by 4 publications

References 14 publications

Effect of hydroxy groups and microtopography generated by a nanosecond-pulsed laser on pure Ti surfaces

Effect of hydroxy groups and microtopography generated by a nanosecond-pulsed laser on pure Ti surfaces

Effect of Shot Particle on the Mechanism of Creating a Modified Layer by Atmospheric Controlled IH-FPP Treatment

Metal Silicide on the Steel Substrate Formed by Atmospheric Controlled IH-FPP (AIH-FPP) and Its Effect on Corrosion Resistance Improvement

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