Hybrid Surface Modification of SCM 415 Material by Vacuum Carburizing and Fine Particle Peening.

Egami, Noboru; Kagaya, Chuji; Inoue, Nobuyuki; Takeshita, Hiroaki; Mizutani, Haruya

doi:10.1299/kikaia.66.1936

Cited by 24 publications

(10 citation statements)

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“…According to Egami et al, 17) the Vickers hardness of 950 and residual stress of -1 850 MPa were attained in the surface-hardened layer of vacuum-carburized SCM415 steel subjected to two step FPP under total arc-height of 0.31 mm (N). Such the hardness and absolute value of the residual stress are slightly higher than those (Fig.…”

Section: Surface-hardened Layer Propertiesmentioning

confidence: 99%

“…In general, the hardness in a surface-hardened layer of the carburized steels is enhanced by the following microstructural changes developed by FPP: (i) Formation of a white layer and increases in the dislocation density in the matrix and untransformed retained austenite because of severe plastic deformation; [10][11][12][17][18][19]24) (ii) Increase in the volume fraction of hard martensite because of the strain-induced martensite transformation of the retained austenite. [25][26][27][28][29][30][31][32] The relationship between the maximum Vickers hardness and the maximum volume fraction of strain-induced martensite in the TM and SNCM420 steels is shown in Fig.…”

Section: Maximum Vickers Hardness In the Surface-hardened Layermentioning

confidence: 99%

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Surface-hardened Layer Properties of Newly Developed Case-hardening Steel

2018

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The effects of fine-particle peening conditions on the surface-hardened layer properties of newly developed case-hardening steel, i.e., transformation-induced plasticity-aided steel with a chemical composition of 0.2% C, 1.5% Si, 1.5% Mn, 1.0% Cr, 0.2% Mo, and 0.05% Nb (mass%) were investigated for the fabrication of automotive drivetrain components. The surface roughness decreased with decreasing archeight of fine-particle peening after vacuum carburization. A white layer developed on the surface of the steel peened at arc-heights greater than 0.41 mm (N). The maximum Vickers hardness and maximum compressive residual stress increased with increasing arc-height in the steel. These values were higher than those of commercial case-hardening steels. The increased volume fraction and expansion strain of the strain-induced martensite increased the hardness and compressive residual stress in the surfacehardened layer of the steel, although severe plastic deformation made a substantial contribution to enhancing the surface-hardened layer properties.

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Section: Surface-hardened Layer Propertiesmentioning

confidence: 99%

Section: Maximum Vickers Hardness In the Surface-hardened Layermentioning

confidence: 99%

Surface-hardened Layer Properties of Newly Developed Case-hardening Steel

2018

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“…The maximum size 50µm will be used for the calculation in § 3.3. After hobbing, some of the as-austempered gears were processed by one of two types of FPB (18) . FPB causes case hardening and generates compressive residual stress as a result of striking the fine particles at high speed as well as preventing increase in surface roughness caused by conventional shot peening.…”

Section: Test Gearsmentioning

confidence: 99%

Bending Fatigue Strength of Austempered Ductile Iron Spur Gears

Yamanaka

Tamura

Inoue

et al. 2009

JAMDSM

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This paper deals with an experimental evaluation of bending fatigue strength for austempered ductile iron (ADI) spur gears. The module is 2.5 and the number of teeth is 26 in the test gears. The material of the test gears corresponds to Japan Industrial Standard (JIS) FCAD1100-15. Some gears are processed by one of two types of fine particle bombarding (FPB). The surface roughness is slightly increased by FPB. The obtained strengths are 623 MPa for the as-austempered gears, and 1011 and 1085 MPa for the gears after FPB. The strength is expressed by the fillet stress level, which is calculated by FEM. The strength of a gear with the same dimensions made of carburized SCr420H alloy steel is 1205 MPa, and the strength of the ADI gear is approximately half that of the carburized steel gear. The FPB process has a significant effect on the ADI gear, improving its strength by 62-74%.

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“…The surface modification processing methods include many processing methods including carburizing and a nitriding, such as a fine particle peening. [4][5][6]. The vacuum carburizing processing which is one of the surface modification disposal methods is a disposal method excellent in the improvement in fatigue characteristics, because oxygen is not included during carburizing atmosphere and I an internal oxidation etc.…”

Section: Introductionmentioning

confidence: 99%

Influence of vacuum carburizing treatment on fatigue crack growth characteristic in DSG2

Nambu¹,

Egami²

2015

Frattura Ed Integrità Strutturale

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ABSTRACT.The aim of this research is to clarify the influence of vacuum carburizing on the fatigue-crack progress characteristics of DSG2 steel. The test specimen tempering material (QT material) and vacuum carburizing material (VC material) has been used. The fatigue-crack progress was examined by subjecting the samples to four-point bending. The loading-capacity fixed experiment was done using a maximum load of P max = 4000-7000 N. The ΔK fixed experiment was done using a load of ΔK = 18-36 MPa√m. The crack progress speed of VC material fell, after the high crack progress speed was shown, and after it showed the minimum, it showed the tendency to go up again. This is considered to be what is depended on the compressive residual stress given to the carburizing layer. From this, it is thinkable that there is a crack progress depression effect in a carburizing layer. In VC material, a carburizing layer has a crack progress depression effect from a plunger-helix bottom to about 2.6 mm, and it turned out that it is larger than an effective carburizing layer. Moreover, in each ΔK, it was shown that depression effect revelation differs and the crack progress process accompanying it was able to be shown typically.

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Hybrid Surface Modification of SCM 415 Material by Vacuum Carburizing and Fine Particle Peening.

Cited by 24 publications

References 0 publications

Surface-hardened Layer Properties of Newly Developed Case-hardening Steel

Surface-hardened Layer Properties of Newly Developed Case-hardening Steel

Bending Fatigue Strength of Austempered Ductile Iron Spur Gears

Influence of vacuum carburizing treatment on fatigue crack growth characteristic in DSG2

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