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Alpha-Case Reduction Mechanism of Titanium Powder-Added Investment Molds for Titanium Casting

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Abstract

The surface alpha-case reaction of Ti casting using Ti powder-added investment molds was investigated. During the curing procedure, Ti powders (0, 10, and 50 mass%) were mixed with three types of investment mold materials (Al2O3, ZrSiO4, and ZrO2) to form an interstitial TiO2 phase, which is an alpha-case reaction compound. The microstructure and surface hardness profiles of Ti castings with Ti powder-added investment molds indicated that the alpha-case thickness was significantly reduced from approximately 350 to 50-100 μm, and a remarkable reduction in the maximum micro-Vickers hardness value of the Ti casting surface was also achieved. As observed from the experimental results, the alpha-case reduction mechanism suggested that the phase transformation from TiO2 to TiO not only acts as an effective barrier to O diffusion, but also reduces Al, Si, and Zr concentrations at the casting surface. This reduction might be caused by contact area reduction between the Ti powder-added investment molds and the Ti melts.

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Authors and Affiliations

  1. School of Advanced Materials Science & Engineering, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon, 440-746, Republic of Korea

    Bong-Jae Choi, Seul Lee & Young-Jig Kim

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  1. Bong-Jae Choi
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  2. Seul Lee
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  3. Young-Jig Kim
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Correspondence to Young-Jig Kim.

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Choi, BJ., Lee, S. & Kim, YJ. Alpha-Case Reduction Mechanism of Titanium Powder-Added Investment Molds for Titanium Casting. J. of Materi Eng and Perform 23, 1415–1423 (2014). https://doi.org/10.1007/s11665-013-0859-6

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  • DOI: https://doi.org/10.1007/s11665-013-0859-6

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