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Journal of Materials Engineering and Performance
Published in: Journal of Materials Engineering and Performance 4/2014

01-04-2014

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

Authors: Bong-Jae Choi, Seul Lee, Young-Jig Kim

Published in: Journal of Materials Engineering and Performance | Issue 4/2014

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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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Metadata
Title
Alpha-Case Reduction Mechanism of Titanium Powder-Added Investment Molds for Titanium Casting
Authors
Bong-Jae Choi
Seul Lee
Young-Jig Kim
Publication date
01-04-2014
Publisher
Springer US
Published in
Journal of Materials Engineering and Performance / Issue 4/2014
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-013-0859-6

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