Bottom surface smoothing of high aspect ratio hole by guiding large-area electron beam with magnet

Shinonaga, Togo; Lu, Jiayu; Kimura, Mitsuhiro; Inoue, Masaaki; Okada, Akira

doi:10.1007/s00170-021-08380-w

Cited by 3 publications

(1 citation statement)

References 18 publications

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“…This technique could be applied to the surface smoothing and modification of mold steel [15], titanium alloy [16], stainless steel [17] and cemented carbide [18]. Bottom surface of high aspect ratio hole could be also smoothed by guiding LEB under control of magnetic field [19]. Shinonaga et al, [20] recently found that surface irregularities such as spatter and cavity of AMed maraging steel and aluminum alloy produced by PBF with laser beam could be repaired efficiency by the LEB irradiation.…”

Section: Introductionmentioning

confidence: 99%

Surface finishing and change in residual stress of AMed titanium alloy by combination of grit blasting and large-area EB irradiation

Shinonaga

Kobayashi²,

Okada³

et al. 2023

Preprint

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Additively manufactured (AMed) titanium products are typically produced by electron beam melting (EBM), since oxidation of titanium alloy surface can be suppressed in vacuum ambience. The surface roughness of AMed titanium products becomes more than 200µmRz, and the very rough surface would lead to reduction in surface strength. Therefore, a post surface finishing process is required. Abrasive blasting is one of the common surface smoothing processes of AMed metal products. Large surface roughness can be decreased, and compressive residual stress can be introduced to the surface. However, there is a limitation to reduction of surface roughness to several µmRz. On the other hand, it was recently found that AMed metal surface produced by powder bed fusion with laser beam could be smoothed by large-area electron beam (LEB) irradiation. However, it is difficult to smooth surface with large initial surface roughness, and a tensile residual stress may be generated on the surface. In this study, surface finishing and change in residual stress of AMed titanium alloy were proposed by combination of grit blasting and LEB irradiation. Surface roughness of AMed titanium alloy significantly decreases from 265µmRz to about 2.0µmRz by combination of grit blasting and LEB irradiation. Reduction rate of surface roughness by LEB irradiation linearly increases with decreasing mean width of blasted surface. Influence of the mean width on smoothing effect by LEB irradiation can be explained by thermo-fluid analysis. Moreover, tensile residual stress caused by LEB irradiation can be reduced when LEB is irradiated to blasted surface.

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Section: Introductionmentioning

confidence: 99%

Surface finishing and change in residual stress of AMed titanium alloy by combination of grit blasting and large-area EB irradiation

Shinonaga

Kobayashi²,

Okada³

et al. 2023

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

Surface smoothing of additively manufactured Ti-6Al-4V alloy by combination of grit blasting and large-area electron beam irradiation

Shinonaga

Kobayashi

Okada

et al. 2023

Int J Adv Manuf Technol

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Additively manufactured (AMed) titanium products are typically produced by electron beam melting (EBM), since oxidation of titanium alloy surface can be suppressed in vacuum environment. The surface roughness of AMed titanium products becomes more than 200 µm Rz, and the very rough surface would lead to reduction in fatigue strength. Therefore, a post surface finishing process is required. Abrasive blasting is one of the common surface smoothing processes of AMed metal products. Large surface roughness can be decreased, and compressive residual stress can be introduced to the surface. However, there is a limitation to reduction of surface roughness to several µm Rz. On the other hand, it was recently found that AMed metal surface produced by powder bed fusion with laser beam could be smoothed by large-area electron beam (LEB) irradiation. However, it is difficult to smooth surface with large initial surface roughness, and a tensile residual stress may be generated on the surface. In this study, surface smoothing and change in residual stress of AMed titanium alloy (Ti-6Al-4 V) were proposed by combination of grit blasting and LEB irradiation. Surface roughness of AMed Ti-6Al-4 V alloy significantly decreases from 265 to about 2.0 µm Rz by combination of grit blasting and LEB irradiation. Reduction rate of surface roughness by LEB irradiation linearly increases with decreasing mean width of blasted surface. Influence of the mean width on smoothing effect by LEB irradiation can be explained by thermo-fluid analysis. Moreover, tensile residual stress caused by LEB irradiation can be reduced when LEB is irradiated to blasted surface.

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Application of large-area electron beam irradiation to micro-edge filleting

Shinonaga,

Tajima,

Okamoto

et al. 2023

Journal of Manufacturing Processes

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Bottom surface smoothing of high aspect ratio hole by guiding large-area electron beam with magnet

Cited by 3 publications

References 18 publications

Surface finishing and change in residual stress of AMed titanium alloy by combination of grit blasting and large-area EB irradiation

Surface finishing and change in residual stress of AMed titanium alloy by combination of grit blasting and large-area EB irradiation

Surface smoothing of additively manufactured Ti-6Al-4V alloy by combination of grit blasting and large-area electron beam irradiation

Application of large-area electron beam irradiation to micro-edge filleting

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