| 摘要 |
PROBLEM TO BE SOLVED: To provide a β type titanium alloy which can obtain high fatigue strength even in a high load stress of ≥900 MPa. SOLUTION: The β type titanium alloy contains, by mass, 4.0 to 10.0% V, ≥2.0% Sn and ≥2.0% Al. In the metallic structure, α phases 1 with a width of ≥0.05 μm has a shape settled between optional two straight lines parallel at an intervals of 0.3 μm, also, the length of the α phases 1 is ≤5 μm, and further, the maximum grain size of β phases is ≤50 μm. Further, T1 defined by expression T1=937+147.7[O]+20.4[Al]+161.8[C]-19.8[Fe]-10.3[Mo]-8.4[Nb]-13.1[V]-17.0[Cr]-0.2[Sn]-8.5[Cu] is >700 to <800. COPYRIGHT: (C)2011,JPO&INPIT |
