Method for improving liquid-state fluidity of TiAl-Nb alloy
A tial-nb and fluidity technology, which is applied in the field of improving the liquid fluidity of TiAl-Nb alloys, can solve the problems of niobium-aluminum segregation and uneven as-cast microstructure of the alloy, and achieves the reduction of aluminum segregation, shrinkage cavities, and uniform alloy composition. Effect
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[0017] Example 1
[0018] Choose high-purity Ti, Al and Nb raw materials with a purity of 99.99%, and the proportioning composition is Ti 50 Al 40 Nb 10 Alloy.
[0019] (1) Using water-cooled copper crucible electromagnetic induction levitation smelting, first place niobium on the bottom of the copper crucible, place titanium along the inner wall of the copper crucible, put aluminum on the niobium and avoid contact with the copper crucible, adjust the power to 10kw and start smelting. Hold for 20s, then adjust to 15kw until the metal is all melted and suspended, then adjust the power to 20kw and hold for 180s, and the ingot is repeatedly smelted for 4 to 5 times. Among them, the copper crucible is a copper crucible with a conical bottom;
[0020] (2) Gravity casting of master alloy ingots with vacuum non-consumable arc melting furnace: vacuum to 10 -3 Below Pa, blow in argon gas to 0.3MPa; turn on the power to start the arc, and after the arc is successful, place the tungsten pole in...
Example Embodiment
[0021] Example 2
[0022] The composition is Ti 47 Al 45 Nb 8 Alloy. Other conditions are the same as in Example 1. The sample rods with no shrinkage cavities and porosity defects and a uniform length of 15 cm can be obtained, such as image 3 , Cut the sample rod in half to observe the microstructure and scan the surface. The actual composition of the alloy is accurately controlled within the error range.
Example Embodiment
[0023] Example 3
[0024] The composition is Ti 45 Al 50 Nb 5 Alloy. The other conditions are the same as in Example 1. A sample rod with no shrinkage cavities and porosity defects and a uniform length of 15 cm can be obtained.
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