Fe, V, B 添加 TiAl 合金の熱処理組織と常温引張特性におよぼす溶存酸素量の影響

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We examined the effects of dissolved oxygen content on room temperature tensile properties of a gamma TiAl alloy, Ti-46.7 Al-1.3 Fe-1.1 V-0.35B (mol%) developed as a casting material for turbine components, for replacing superalloys. The ductility and the tensile strength were reduced with the increase of dissolved oxygen content. Then, we focused on the relationship between dissolved oxygen content and microstructure. Oxygen had a significant effect on the amount of lamella phase and the presence of the beta phase. According to composition analysis by using EPMA, as compared that of TiAl-Fe-V-B alloy with approximately 500ppm oxygen, the alpha and gamma two-phase field was extended with an increase in the oxygen content. On the basis of these experimental results, we discussed the allowable content of oxygen to avoid the decrease of the room temperature ductility and tensile strength and to meet the design requirements.
社団法人日本鉄鋼協会の論文
1997-10-01