二元系α+βTi 合金と準安定βTi 合金の連続冷却変態に関する研究

概要

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The continuous cooling transformation diagrams of Ti-Cr, Ti-Mn, Ti-V and Ti-Mo alloys were plotted for investigations of ω phase in the cooling process of binary α+β and metastable β titanium alloys. The supersaturated β phase decomposes with following processes for changing solute concentration and cooling rates, β_0⟶β_i+α'+ω(ω'), β_0⟶β_i+ω(ω'), β_0⟶β_i+α, where β_0 represents β phase as solution treated, β_i represents nonequilibrium β phase whose solute concentration changes with progress of decomposition and represents a pre-precipitation of ω phase. The precipitation temperature of ω phase decreases with increace of cooling rates. At the slower cooling rates α phase precipitates directly from β phase without precipitation of ω phase. The range for precipitation of ω phase in the cooling process of binary α+β and metastable β titanium alloys by the electron concentration and cooling rates can be represented as a simple diagram. In conditions excluding this area it is possible to prevent precipitation of ω phase in the welded titanium alloys.
社団法人溶接学会の論文
1972-04-25