A thermomechanical treatment method for controlling the fine-grain structure of tial alloy
A deformation heat treatment and heat treatment furnace technology, which is applied in the field of thermal processing and preparation of high-temperature structural materials, can solve the problems of room temperature plasticity but poor high-temperature performance, poor mechanical properties near γ-structure, and no engineering application value, and achieves easy deformation and elimination of genetics. Sexual influences, the effect of eliminating bad structures
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Embodiment 1
[0053] This example is a deformation heat treatment method for obtaining a fine-grained full-lamellar structure of TiAl alloy by using pre-deformation treatment and isothermal heat treatment in combination, and Ti-48.5Al-4Nb-2Cr-0.3(Fe, C, N) Alloy as an example, to be described in detail.
[0054] The Ti-48.5Al-4Nb-2Cr-0.3 (Fe, C, N) alloy is obtained by vacuum electrode self-consumption + water-cooled copper crucible induction melting centrifugal casting method, and the α of the composition alloy is obtained by metallography and differential thermal analysis. The temperature range of the single-phase region is 80°C, the temperature at the junction of the α single-phase region and the α+γ two-phase region, that is, the Tα temperature is 1390°C, the temperature range of the α+γ two-phase region is 130°C, and the Tγ temperature is 1260°C. like image 3 As shown, its microstructure is composed of coarse lamellar clusters with an average size greater than 300 μm and γ grains, an...
Embodiment 2
[0060] This embodiment is a deformation heat treatment method for obtaining TiAl alloy fine-grained near-lamellar layers by combining pre-deformation treatment and isothermal heat treatment, and taking Ti-47Al-2Nb-2Cr-0.2(C, N) alloy as an example, be described in detail.
[0061]The Ti-47Al-2Nb-2Cr-0.2(C, N) alloy is obtained by vacuum electrode self-consumption + water-cooled copper crucible induction melting gravity casting method, and the α single phase of the composition alloy is obtained by metallographic method and differential thermal analysis method The temperature range of the zone is 130°C, the temperature at the junction of the α single-phase zone and the α+γ two-phase zone, that is, the Tα temperature is 1340°C, the temperature range of the α+γ two-phase zone is 200°C, and the Tγ temperature is 1140°C. like Figure 5 As shown, its microstructure is completely composed of coarse lamellar clusters with an average size of more than 500 μm, which belongs to the full ...
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