a型焼結Ti-Cr合金の2相微細化処理

概要

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By the reversion from hcp martensite (α) to bcc phase (β), refining of the microstructure with (α+β) two-phase was attempted in sintered Ti-(2-4)mass%Cr alloys. The relation between mechanical properties and micro-structures was also investigated for the specimens subjected to several heat treatments.<BR>Quenching from β single phase region gives α structure in the Ti-Cr alloys containing 2-4mass%Cr, and the annealing of α in the (α+β) two-phase region leads to the formation of very fine micro-duplex structure of (α+β). The balance between tensile strength and elongation can easily be controlled by varying annealing temperature. In order to obtain excellent mechanical properties, however, β phase in the micro-duplex structure should be stable enough thermally and also against deformation.
社団法人粉体粉末冶金協会の論文