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Vol.38, No.9, 1203 ~ 1210, 2000
Title
Room and Elevated Temperature Tensile Properties of Low Cost , High Strength Ti-Fe-Si Alloys
정희원Hi Won Jeong,김승언Seung Eon Kim,현용택Yong Taek Hyun,이용태Yong Tai Lee
Abstract
A TFS(Ti-xFe-ySi) alloy system has been newly designed for a high strength titanium alloy with low cost. In this study, Fe was selected as β-stabilizer to replace expensive β-stabilizing elements such as V, Mo. In addition, Si was selected as third element to compensate the high temperature mechanical properties. Fe contents of over 4 wt% stabilize β phase even at room temperature. Coarse silicide chain was formed at prior β grain boundary in TFS alloys containing over 2 wt% of Si, and deteriorated the mechanical properties. Fe was dissolved in Ti matrix as solid solution and increased α/β phase boundaries. Si was also dissolved as solid solution or precipitated finely in Ti matrix. The optimum composition range was Ti-4Fe-(0.5∼1)Si. Ultimate tensile strength was a range of 799∼831 ㎫ at room temperature and 532∼585 ㎫ at 400℃ which are comparable to Ti-6Al-4V.
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