PURPOSE: To provide superior wear resistance and seizure resistance by precipitating prescribed amounts of Ti3AlC grains in a beta titanium alloy.
CONSTITUTION: Ti3AlC grains and α-phases are precipitated and allowed to exist as a mixture in a beta titanium alloy in which TiC grains are dispersed. At this time, the amount of precipitation of the Ti3AlC grains is regulated to 0.3-0.7 by [Ti3AlC intensity/TiC intensity] by the X-ray diffraction method, and also the amount of precipitation of the α-phases is regulated to 4-12 similarly by [α-phase intensity/β-phase intensity]. At the time of precipitating the Ti3AlC grains and the α-phases from the beta titanium alloy, it is preferable that a first heating stage, where the alloy is heated and held to and at 800-900°C to precipitate the Ti3AlC grains, and a second heating stage, where the alloy after the completion of the above stage is heated and held to and at 400-550°C to precipitate the α-phases, are successively performed. Further, the beta titanium alloy in which TiC grains are dispersed can be prepared by adding Cr3C2 to a molten Ti-6Al-4V alloy and refining this molten alloy.
MANABE AKIRA
KIRIYAMA MIKIO
NITTAN VALVE
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