THE TRANSFORMATION OF $alpha$ + $beta$ TITANIUM ALLOYS WITH ALUMINUM (in German)
Journal Article
·
· Z. Metallk.
OSTI ID:4752404
The transformation behavior of the titanium alloys Ti -6Al--4Cr, Ti--6Al- -6Cr, Ti--7Al-3Cr, Ti-6Al--6Mo, Ti-7Al --4Mo, Ti --6Al --4V, and Ti --6Al --6V was studied during continuous cooling by the dilatometer. All alloys have a subcritical alloy content, the only exception being Ti --6A1 -6Cr. The BETA phase transforms at high cooling rates into the alpha ' phase, which decomposes on further cooling into a alpha + BETA mixed structure. The temperatures indicating start and end of the alpha ' formation, start of the alpha ' decomposition, and the critical cooling rate are lowered by increasing contents of Va, Mo, and Cr in this order. The transformation during quench and reheat treatments was investigated only for the Cr-containing alloys. The alpha ' phase of Ti --7Al--3Cr decomposes completely during water quenching, the alloy Ti --6Al --4Cr contains, however, some untransformed portions of the alpha " phase. On reheating transformation processes take place both in the alpha and in the BETA phase. This can be illustrated by partial transformation diagrams. The transformation of the BETA phase by the precipitation of the alpha and gamma c phase corresponds to the reactions being known from investigations on Ti --Cr alloys without Al. At low temperatures, delta (Ti/sub 2/Al) phase precipitates from the alpha phase, whereas at high temperatures the gamma /sub Al/ (Ti/sub 3/ Al) phase forms. In a small temperature region delta and gamma /sub Al/ phase coexist. The activation energies for the formation of the delta and the gamma / sub Cr/ phases correspond to the diffusion of Al and Cr. (auth)
- Research Organization:
- Forschungsinstitut der Deutsche Edelstahlwerke A. G., Krefeld, Ger.
- NSA Number:
- NSA-17-016721
- OSTI ID:
- 4752404
- Journal Information:
- Z. Metallk., Journal Name: Z. Metallk. Vol. Vol: 54
- Country of Publication:
- Country unknown/Code not available
- Language:
- German
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