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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 at 1250°C and cyclic tempering at 1000 and 1200°C three times after solution treatment at the temperature above α phase transus followed by immediate fan cooling. The fine and homogeneous near-γ microstructure can be obtained by this heat treatment, which causes the breakdown of as-cast microstructure and prevents the anomalous growing of original γphase.
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 at 1250 ° C and cyclic tempering at 1000 and 1200 ° C three times after solution treatment at the temperature above α phase transus followed by immediate fan cooling. The fine and homogeneous near-γ microstructure can be obtained by this heat treatment, which causes the breakdown of as-cast microstructure and prevents the anomalous growing of original γphase.