The grain refinement of an as-cast Ti-46Al-8.5Nb-0.2W (atom fraction in %)alloy by the cyclic heat treatments was studied. The heat treatment scheme included a tempering at1250℃ and cyclic tempering at 1000 and 1200...The grain refinement of an as-cast Ti-46Al-8.5Nb-0.2W (atom fraction in %)alloy by the cyclic heat treatments was studied. The heat treatment scheme included a tempering at1250℃ and cyclic tempering at 1000 and 1200℃ three times after solution treatment at thetemperature above α phase transus followed by immediate fan cooling. The fine and homogeneousnear-γ microstructure can be obtained by this heat treatment, which causes the breakdown of as-castmicro-structure and prevents the anomalous growing of original γ phase.展开更多
基金This work was financially supported by the State Key Project for Fundamental Research Developing Plan (No. G2000067206-2)
文摘The grain refinement of an as-cast Ti-46Al-8.5Nb-0.2W (atom fraction in %)alloy by the cyclic heat treatments was studied. The heat treatment scheme included a tempering at1250℃ and cyclic tempering at 1000 and 1200℃ three times after solution treatment at thetemperature above α phase transus followed by immediate fan cooling. The fine and homogeneousnear-γ microstructure can be obtained by this heat treatment, which causes the breakdown of as-castmicro-structure and prevents the anomalous growing of original γ phase.
