Atypical phase transformation behavior of Fe-33%Ni alloys induced by shot peening

Sato, Hisashi; Nishiura, Takayuki; Moritani, Tomokazu; Watanabe, Yoshihiko

doi:10.1016/j.surfcoat.2023.129470

Cited by 5 publications

(3 citation statements)

References 33 publications

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“…The impact of SP on the surface integrity of gears, especially surface roughness, should be considered comprehensively, as shown in the study by Vicen [54]. Moreover, higher SP parameters may lead to incremental sample temperatures, which can potentially harm the contact fatigue performance of LSMSPed gears, as pointed out by Sato Hisashi [55]. Incremental SP parameters can generate deformation heat during the process, resulting in stress-induced reverse phase transformation, including an increase in residual austenite content, which is generally acknowledged as a detrimental factor for the contact fatigue performance of gears.…”

Section: Contact Fatigue Test Results Of Gearsmentioning

confidence: 98%

The effect of shot peening on the contact fatigue performance of C40 steel gears after laser surface melting

Lv,

Cui,

Sun

et al. 2024

Surf. Topogr.: Metrol. Prop.

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In this paper, shot peening (SP) was employed as a post-processing technique for the laser surface melted (LSMed) gear. The aim was to improve the contact fatigue performance of laser surface melting+shot peened (LSMSPed) gears. The microstructure, surface roughness, residual stress, microhardness of C40 steel gears before and after SP treatment were characterized using scanning electron microscopy, X-ray diffraction stress analyzer, contour measuring instrument, and hardness tester. Fatigue test of gear was carried out with a Forschungsstelle für Zahnräder und Getriebebau (FZG) testing machine. Following the laser surface melting (LSM) treatment, a molten layer was observed on the gear teeth surface. The experimental results indicated that SP induced a hardened layer with a certain thickness and plastic deformation on the surface of LSMed gears. Importantly, as the SP parameters increased, there's a corresponding reduction in both the average grain diameter and the maximum grain diameter. The reduction was most pronounced when the shot diameter reached its maximum value. It's worth noting that once the optimal threshold for SP parameters is surpassed, the residual compressive stress and microhardness on the LSMSPed gear surface do not exhibit a continuous growth trend. Furthermore, the rise in SP parameters resulted in a gradual increase in the surface roughness of LSMSPed gears, albeit to varying degrees. In light of the combined effects of grain refinement, residual compressive stress, microhardness, and surface roughness, the contact fatigue performance of LSMSPed gears improved with increasing SP parameters. Notably, when comparing the contact fatigue life of LSMed gears with that of LSMSPed gears, we observed a substantial enhancement. However, it's essential to highlight that when the shot diameter reaches its maximum value, the contact fatigue life of the LSMSPed gear, somewhat unexpectedly, decreased.

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Section: Contact Fatigue Test Results Of Gearsmentioning

confidence: 98%

The effect of shot peening on the contact fatigue performance of C40 steel gears after laser surface melting

Lv,

Cui,

Sun

et al. 2024

Surf. Topogr.: Metrol. Prop.

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show abstract

“…Because the SP can induce compressive residual stress around the peened surface, the SP is usually applied to improve the fatigue strength and the corrosion resistance of the metallic materials [1][2][3][4]. Furthermore, when the SP is subjected to the metallic materials, the grains around the peened surface are highly refined and the surface hardness is considerably increased [5][6][7][8][9][10]. This is because that the SP can introduce large strain on the peened surface.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, they have concluded that the formation of the nanocrystalized layer comes from large strain induced by the SP. On the other hand, Sato et al have reported microstructural changes of the Fe-33%Ni alloy [10] and SUS304 austenitic steel [6], which have fcc crystal structure, by the SP. They also found that subsurface layer with fine grains was formed by the SP for the Fe-33%Ni alloy and SUS304 austenitic steel.…”

Section: Introductionmentioning

confidence: 99%

Crystallographic Textures of Al and Al-Mg Alloy Formed by Shot-Peening

Sato,

Mihara-Narita,

Watanabe

et al. 2023

MSF

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Shot-peening (SP) is one of the severe surface plastic deformation (SSPD) processing techniques. Due to large plastic strain by the SP, the SP for metallic materials forms crystallographic texture on the peened surface. Since the crystallographic texture formed by the SP depends on the dislocation slip, it can be expected that this texture is affected by stacking fault energy (SFE) of the materials. However, effects of the SFE on the crystallographic texture formed on the peened surface by the SP is not clear. In this study, crystallographic textures of pure Al (higher SFE) and Al-10 mass%Mg alloy (lower SFE) formed by the SP are investigated. When the pure Al is SPed, {001}+{111} double fiber texture with the <001> and <111> directions parallel to the plane normal direction of the peened surface is obtained. On the other hand, in the case of Al-10 mass%Mg alloy with the SFE close to the pure Cu, {110} fiber texture is formed as well as the pure Cu. Therefore, it is found that the crystallographic texture formed by the SP is influenced by the SFE.

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Molecular dynamics simulations of solid-state sintering in Fe35Ni alloy: understanding the process at the atomic scale

Sahni,

Bhowmick,

Upadhyaya

2024

J Mater Sci

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Atypical phase transformation behavior of Fe-33%Ni alloys induced by shot peening

Cited by 5 publications

References 33 publications

The effect of shot peening on the contact fatigue performance of C40 steel gears after laser surface melting

The effect of shot peening on the contact fatigue performance of C40 steel gears after laser surface melting

Crystallographic Textures of Al and Al-Mg Alloy Formed by Shot-Peening

Molecular dynamics simulations of solid-state sintering in Fe35Ni alloy: understanding the process at the atomic scale

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