Uniaxial Compression Properties and Compression Fatigue Performance of Selective Laser Melted Ti?6Al?4V Cellular Structure

Ming‑Wei Wu; Jhewn‑Kuang Chen; Mo‑Kai Tsai; Pei Wang; Tien‑Lin Cheng; Bo‑Huan Lin; Po‑Hsing Chiang; Annadurai Dhinakar

doi:10.1007/s12540-021-01021-7

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자료유형: 학술저널

저자정보: Ming‑Wei Wu (National Taipei University of Technology) Jhewn‑Kuang Chen (National Taipei University of Technology) Mo‑Kai Tsai (National Taipei University of Technology) Pei Wang (Shenzhen University) Tien‑Lin Cheng (Digital-Can Tech Company Ltd.) Bo‑Huan Lin (National Taipei University of Technology) Po‑Hsing Chiang (National Taipei University of Technology) Annadurai Dhinakar (National Taipei University of Technology)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.28 No.1

발행연도: 2022.1

수록면: 132 - 144 (13page)

DOI: 10.1007/s12540-021-01021-7

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The selective laser melted (SLM) Ti?6Al?4V cellular solid is a promising material in biomedical and other applications. The mechanical properties of the SLM Ti?6Al?4V cellular material are predominantly controlled by the design of the cellular structure. The objective of this study was to investigate the uniaxial compressive properties and compressive fatigueperformance of the SLM Ti?6Al?4V cellular solid with a new cuboctahedron unit cell reinforced by four diagonal strutsand two horizontal struts along the X and Y axes. The infuences of hot isostatic pressing (HIP) on the various mechanicalproperties were also examined. The results showed a smoother stress?strain curve and fewer stress oscillations in the HIPspecimen than in the SLM specimen. The HIP process slightly decreased the yield strength of the SLM sample from 55 to52 MPa. Under uniaxial compressive stress, the SLM and HIP specimens exhibited layer-by-layer fracture and diagonalshear fracture, respectively. Furthermore, the HIP treatment signifcantly increased the fatigue performance and improved thefatigue endurance ratio at 106cycles from 0.15 to 0.35. The HIP treatment contributed to several positive efects, includingphase transformation from brittle α′ to α + β, the elimination of strut porosity and residual stress, an increase in lath size,and a better combination of strength and ductility, thereby improving the fatigue performance. The efects of stress mode onthe fracture mechanism were also clarifed using in situ observation in combination with digital image correlation.

#Ti?6Al?4V · Additive manufacturing · Cellular solid · Hot isostatic pressing · Digital image correlation

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