Build direction dependence of microstructure and high-temperature tensile property of Co–Cr–Mo alloy fabricated by electron beam melting

Shi, Shuyan; Koizumi, Yuichiro; Kurosu, Shingo; Li, Yunping; Matsumoto, Hiroaki; Chiba, Akihiko

doi:10.1016/j.actamat.2013.10.017

Cited by 176 publications

(70 citation statements)

References 26 publications

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“…The tensile testing of specimens fabricated by EBAM produced average UTS of 1.45 GPa, YS of 0.51 GPa, and an elongation of 3.6%, which are better than wrought or cast Co-Cr-Mo alloys. Sun et al [49] Ramirez et al [50] investigated the effects of precipitate (Cu 2 O) on the microstructure and mechanical properties of EBAM Cu parts. These precipitate-dislocation architectures create increased hardness, ranging from a base-plate hardness of HV 57 to an EBAM part hardness of HV 88, referenced to the precursor powder containing Cu 2 O precipitates that has a hardness of HV 72.…”

Section: Other Materials Used In Ebammentioning

confidence: 99%

Review on powder-based electron beam additive manufacturing technology

Gong

Anderson

Chou

2014

Manufacturing Review

149

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-This paper presents a thorough literature review of the powder-based electron beam additive manufacturing (EBAM) technology. EBAM, a relatively new additive manufacturing (AM) process, can produce full-density metallic parts directly from the electronic data of the designed part geometry. EBAM has gained broad attentions from different industries such as aerospace and biomedical, with great potential in a variety of applications. The paper first introduces the general aspects of EBAM. The unique characteristics, advantages and challenges of EBAM are then presented. Moreover, the hub of this paper includes extensive discussions of microstructures, mechanical properties, geometric attributes, which impact the application ranges of EBAM parts, with focus on commonly used titanium alloys (in particular, Ti-6Al-4V). In the end, modeling efforts and process metrology of the EBAM process are discussed as well.

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Section: Other Materials Used In Ebammentioning

confidence: 99%

Review on powder-based electron beam additive manufacturing technology

Gong

Anderson

Chou

2014

Manufacturing Review

149

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“…Hereafter, the CCM alloy subjected to HPT and subsequent annealing at the temperature T for the duration of t, is designated by CCM HPTA(T/t) as CCM HPTA(1273 K,0.3 ks) for the case of T = 1273 K and t = 0.3 ks. The equivalent strain ε eq at a distance r from the disk center was estimated by the following equation: 10) ε eq = 2πrN/t √ 3 (1) where N is the rotation number and t is the specimen thickness. ε eq was calculated according to eq.…”

Section: Materials Preparationmentioning

confidence: 99%

“…[1][2][3] The mechanical properties of CCM alloys need to be further improved to reduce the probability of failure in biomedical applications. 4) Grain re nement is effective to improve the mechanical properties of CCM alloys.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Microstructure and Mechanical Properties of Co–Cr–Mo Alloys by High-Pressure Torsion and Subsequent Short Annealing

et al. 2016

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The main target of this study is to optimize the microstructure and to achieve an optimization for the mechanical properties in a biomedical Co-Cr-Mo (CCM) alloy with the nominal composition of Co-28Cr-6Mo (mass%) subjected to high-pressure torsion (HPT) and subsequent short annealing. The γ → ε phase transformation and grain re nement occur in the CCM alloy subjected to HPT processing at an equivalent strain (ε eq ) of 2.25 (CCM HPT ). The HPT processing causes a decrease in the elongation due to the formation of an excessive amount of ε phase. For removal of the excessive amount of ε phases, the CCM HPT was subjected to a short annealing (CCM HPTA ). The effect of the short annealing temperature (1073 K, 1273 K, and 1473 K; annealing time was xed at 0.3 ks) on CCM HPT was investigated. In addition, the effect of the length of duration for the short annealing (0.06 ks, 0.3 ks, and 0.6 ks;) for a xed annealing temperature of 1273 K on CCM HPT was studied. CCM HPTA(1273 K) annealed for 0.3 ks shows a good optimization of mechanical properties that include high strength and large elongation owing to its ultra ne-grained microstructure, and removal of excessive ε phases.

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“…Furthermore, EBM additive manufacturing can produce arti cial implants in different shapes and sizes for different patients at the same time, so it is an attractive way to manufacture Co-Cr-Mo alloy implants. Many studies [21][22][23][24][25] are now conducted on these alloys. In a Co-Cr-Mo alloy at equilibrium, the face-centered cubic (fcc, γ, or γ-fcc) phase is stable at temperatures above 800 C, while the hexagonal close-packed (hcp, ε, or ε-hcp) phase is stable at lower temperatures.…”

Section: Introductionmentioning

confidence: 99%

Effect of Building Position on Phase Distribution in Co-Cr-Mo Alloy Additive Manufactured by Electron-Beam Melting

Takashima

Koizumi

et al. 2016

Mater. Trans.

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Cobalt-chromium-molybdenum (Co-Cr-Mo) alloys are used for biomedical implants such as arti cial joints because they have excellent wear and corrosion resistance and biocompatibility. Electron-beam melting (EBM) is a type of additive manufacturing technique for metals. We used EBM to fabricate 20 rods of a Co-Cr-Mo alloy with height of 160 mm arranged in a 4 × 5 matrix and observed the phase constitution in the middle part (at a height of 80 mm) of the rods by scanning electron microscopy-electron backscatter diffraction. We found that the rods in the center part of the matrix consisted of more of the face-centered cubic (γ) phase and less of the hexagonal close-packed (ε) phase than rods in the outer part. This happened because even though each rod was fabricated under the same beam condition, the rods at the center had been exposed to higher temperature than those in the outer part, and less thermal dissipation took place because the neighboring rods were also heated by the electron beam. This difference in the thermal histories should be taken into consideration when many objects are fabricated simultaneously.

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Build direction dependence of microstructure and high-temperature tensile property of Co–Cr–Mo alloy fabricated by electron beam melting

Cited by 176 publications

References 26 publications

Review on powder-based electron beam additive manufacturing technology

Review on powder-based electron beam additive manufacturing technology

Optimization of Microstructure and Mechanical Properties of Co–Cr–Mo Alloys by High-Pressure Torsion and Subsequent Short Annealing

Effect of Building Position on Phase Distribution in Co-Cr-Mo Alloy Additive Manufactured by Electron-Beam Melting

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