| Title |
A Study on the Identification of Metal/Mold Reaction Product of Ti Investment Casting |
| Authors |
성시영(Seong Si Yeong); 김명균(Kim Myeong Gyun); 김영직(Kim Yeong Jig) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Titanium casting; Investment casting; Metal/mold reaction; Alpha-case |
| Abstract |
The aim of the present study is to investigate the alpha-case formation mechanism between titanium melts and Al₂O₃mold during investment casting of titanium alloys. The metal/mold reaction products of titanium castings were investigated by optical microscope, microhardness profile, EPMA and XRD analysis. In this study, the mechanism of alpha-case formation was verified with thermodynamic calculations. The reaction of only TiO₂interstitial alpha-case formation could not occur spontaneously, on the basis of thermodynamic calculations. From the results of the experimental and thermodynamic calculations, the alpha-case is the reaction products of interstitial oxygen and the substitutional atoms dissolved from the mold materials with titanium, and then this reaction is spontaneous process. |