Surface Properties of Intermetallic Compound Layer Formed on Titanium Alloy by AIH-FPP (Atmospheric Controlled Induction Heating Fine Particle Peening) Treatment

Takesue, Shogo; Saito, Shuya; Komotori, Jun; Misaka, Yoshitaka; Kawasaki, K.

doi:10.2320/matertrans.h-m2018832

Cited by 6 publications

(4 citation statements)

References 15 publications

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“…9,10) Combustion synthesis reactions occurred when aluminum or titanium particles were used, and intermetallic compound layers with high wear resistance and high-temperature oxidation resistance were formed. 11,12) When high-speed tool steel particles with high hardness were shot to the surfaces of structural steels heated to recrystallization temperatures, surface layers containing fine grains with diameters of several micrometers were created owing to dynamic recrystallization, which improved the fatigue properties of AIH-FPP-treated steel. 13) This procedure can be applied to materials that are difficult to refine using only thermal treatments.…”

Section: Introductionmentioning

confidence: 99%

Development of AIH-FPP Carburizing Process Using Carbon Powder

et al. 2023

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In this study, the surface of industrial pure iron was treated with atmospheric-controlled induction heating fine particle peening (AIH-FPP) using mechanical coating (MC) particles of carbon/steel obtained by mixing carbon powder and fine steel particles using mechanical milling. The surface modification effect and the mechanism of its effect were examined and considered by analyzing of the treated surface. Results showed that a modified layer in which carbon elements were diffused was formed near the treated surface by the AIH-FPP treatment using MC particles. In addition, by examining the influence of the treatment conditions on the formation of the modified layer by the design of experiments, the treatment temperature showed the most significant influence among the treatment temperature, peening time, and gas flow rate. The higher the treatment temperature, the deeper the carbon diffused layer. In addition, when treated at ²1273 K, the microstructure near the surface became pearlite, and Vickers hardness increased. The time required for carbon diffusion in the AIH-FPP carburizing process using MC particles of carbon/steel was approximately the same as that of a general carburizing treatment using a reactive gas. In the AIH-FPP carburizing process, carbon is considered to be transferred from the particles to the surface, and the grain boundaries and dislocations increased by fine particle peening (FPP) are used as channels to diffuse inside the specimen. This mechanism is entirely different from the conventional carburizing methods.

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Section: Introductionmentioning

confidence: 99%

Development of AIH-FPP Carburizing Process Using Carbon Powder

et al. 2023

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“…14) The formation of the compound layer at a relatively low heating temperature within a short span of time during AIH-FPP is attributed to the occurrence of a combustion synthesis reaction between Fe and Al 20) and to the local increase in the temperature of the treated surface. 13) According to the XRD data (Fig. 5) and hardness measurements (Fig.…”

Section: Mechanism Of the Surface Modified Layer Formation By Aih-fppmentioning

confidence: 99%

“…In AIH-FPP, an induction-heated metal is subjected to fine particle peening (FPP) under an arbitrary atmosphere. Layers containing intermetallic compounds such as Ni-Al 10) and Ti-Al [11][12][13][14] without non-reacted metallic elements can be formed on the surfaces of the carbon steel 10,11) or titanium alloy [12][13][14] within a few minutes. The modified layers improve the wear resistance and high-temperature oxidation resistance of the substrates.…”

Section: Introductionmentioning

confidence: 99%

“…The modified layers improve the wear resistance and high-temperature oxidation resistance of the substrates. 10,11,13) Possible mechanisms for the rapid formation of the intermetallic compound layer include the occurrence of combustion synthesis reactions between the elements of the shot particles and substrate 13) or diffusion of the shot particle elements transferred to the surface into the substrate. 14) Based on the previous studies, the application of AIH-FPP with shot particles containing aluminum is expected to form an Fe-Al intermetallic compound layer on stainless steel surfaces rapidly, and the tribological properties of the steel would be improved.…”

Section: Introductionmentioning

confidence: 99%

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Formation of Fe–Al Intermetallic Compound Layer by AIH-FPP and its Effect on Tribological Properties of Stainless Steel

Takesue

Misaka²,

Komotori

2021

ISIJ Int.

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In order to increase the surface hardness and improve the tribological properties of stainless steel, Fe-Al intermetallic compound layers were created by atmospheric-controlled induction-heating fine particle peening (AIH-FPP). The surface microstructure of the stainless steel treated with AIH-FPP was characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, and micro-Vickers hardness testing. In addition, the tribological properties were investigated by reciprocating ball-on-disk wear tests. When high-speed steel particles coated with thin aluminum layers were used as the shot particles, Fe-Al intermetallic compound layers were formed at the surfaces of the stainless steel with increased heating time during AIH-FPP. This is because aluminum was transferred from the shot particles, and the temperature at the treated surface increased as a result of a combustion synthesis reaction. When the heating temperature after FPP was increased, the transferred aluminum and nitrogen in the atmosphere reacted, which resulted in the formation of aluminum nitrides in addition to Fe-Al intermetallic compounds. The tribological properties of the stainless steel were improved by AIH-FPP since high-hardness layers were created. The results indicate that the formation of an Fe-Al intermetallic compound layer with high hardness by AIH-FPP is effective for modifying the tribological properties of the stainless steel within a relatively short span of time.

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