Ti-V-Cr-3Al系βTi合金の冷間加工性および時効特性におよぼすβ安定化元素の影響

概要

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Ti-(3∼16)%V-(3∼11)%Cr-3Al beta type alloys are used to investigate the effects of beta stabilized elements on cold workability and aging characteristics. Compressive test and cold rolling test are examined to estimate cold workability of solution treated specimens. Hardness is measured and microstructures are observed to estimate aging characteristics of solution treated and cold rolled specimens.Hardness of solution condition depends mainly on chromium level. Vanadium equivalent is used for an index of beta phase stability. It is useful to distinguish the phase boundary of martensite and beta phase after solution treatment. It is effective for the level of cold workability, too. Specimens that have high vanadium equivalent show good cold-workability. With the increase of vanadium equivalent, age hardening rate is accelated and the increment of hardness by aging is decreased.
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