High-strength corrosion-resistant nickel-based polycrystalline high-temperature alloy and preparation method thereof
A high-temperature alloy and corrosion-resistant technology, which is applied in the field of key components, high-strength corrosion-resistant nickel-based polycrystalline superalloy and its preparation, can solve problems such as poor Al element, inability to protect the substrate, loss of stability of the oxide layer, etc., and achieve excellent high temperature Strength, improved corrosion/oxidation resistance, and good high-temperature structural stability
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[0032] The preparation method of the high-strength and corrosion-resistant nickel-based polycrystalline superalloy includes homogenization treatment after smelting, hot rolling and final heat treatment.
[0033] details as follows:
[0034] 1) Alloy smelting: use a vacuum induction furnace for alloy smelting, and ensure that the vacuum degree is lower than 5×10 before introducing high-purity argon -3 . Subsequently, the electroslag remelting process is used for refining, and finally the alloy ingot is obtained for processing; after electroslag remelting, the content of N element in the alloy is not higher than 300ppm, and the content of P and S is not higher than 0.03%.
[0035] 2) High-temperature rolling: heat the alloy to 950-1020°C for 0.5-1.0 hours, then homogenize it at 1160-1200°C for 24-72 hours, and finally heat it at 50-100°C above the γ' melting temperature High-temperature rolling, the total deformation is not less than 50%, and the deformation per pass is 10-20%...
Embodiment 1
[0041] Limit the content of Cr element in the alloy to less than 17% and increase the content of Al element to more than 5.0%. At the same time, avoid the addition of Mo element and limit the upper limit of Ti element content to no more than 0.5%. The composition meets the following requirements in terms of mass percentage: Cr: 17% , Co: 15%, Ti: 0.5%, Al: 5.0%, W: 7.0%, Si: 0.2%, Mn: 0.2%, Nb: 1.5%, C: 0.04%, and the balance is Ni. Vacuum induction furnace is used for alloy smelting, and the vacuum degree is lower than 5*10 before introducing high-purity argon. -3 . It is then refined using the electroslag remelting process, and finally an alloy ingot is obtained for processing. Ensure that the content of N element in the alloy after electroslag remelting is not higher than 300ppm, and the content of P and S is not higher than 0.03%.
[0042] The alloy is homogenized at 1200°C for 24 hours, and then rolled at a temperature of 70°C above the γ' melting temperature. The total...
Embodiment 2
[0047] Limit the content of Cr element in the alloy to below 17% and increase the content of Al element to above 5.0%. At the same time, avoid the addition of Mo element and limit the upper limit of Ti element content to no more than 0.5%. The composition meets the following requirements in terms of mass percentage: Cr: 16% , Co: 20%, Ti: 0.3%, Al: 5.1%, W: 7.0%, Si: 0.2%, Mn: 0.2%, Nb: 1.8%, C: 0.07%, and the balance is Ni. Vacuum induction furnace is used for alloy smelting, and the vacuum degree is lower than 5*10 before introducing high-purity argon. -3 . It is then refined using the electroslag remelting process, and finally an alloy ingot is obtained for processing. Ensure that the content of N element in the alloy after electroslag remelting is not higher than 300ppm, and the content of P and S is not higher than 0.03%.
[0048] The alloy is homogenized at 1200°C for 24 hours, and then rolled at a temperature of 70°C above the γ' melting temperature, with a total defo...
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