High Integrity Oxide Mold Material for Titanium Investment Casting
The purpose of this research is to verify the alpha-case (a-case) formation behavior and then develop the reaction free mold materials which were based on the a-case formation mechanism. The a-case can cause the cost inefficiency because of the post process such as chemical milling and machining. In order to develop the economic netshape forming technique of Ti by casting process, it is necessary to take a much closer look into the a-case formation. In this research, the a-case formations between molten Ti and investment casting molds were investigated through microstructures, hardness profiles, electron probe micro-analyzer and transmission electron microscopy analysis. Considering the microstructure, hardness profile, EPMA mapping, TEM analysis and thermodynamic consideration, it could be confirmed that the a-case is formed not only by interstitial oxygen element but also by substitutional metallic elements dissolved from mold materials. On the basis of the a-case formation mechanism, a-case controlled mold material could be possible to reduce the a-case reaction layer.
investment casting a-case substitutional interstitial titanium
Bong-Jae Choi Seul Lee Young-Jig Kim
School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, Republic of Korea
国际会议
69th World Foundry Congress(第69届世界铸造会议 WFC 2010)
杭州
英文
632-636
2010-10-16（万方平台首次上网日期，不代表论文的发表时间）