Step-by-step hot isostatic pressing method for additive manufacturing of nickel-based superalloy
A nickel-based superalloy, hot isostatic pressing technology, applied in the field of additive manufacturing processing, can solve the problems of directional grain growth, difficulty in improving material properties, material instability, etc., to achieve increased density and tensile strength, Improve the density and mechanical properties, optimize the effect of the structure
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Embodiment 1
[0032] (1) GH4169 nickel-based superalloy was prepared by selective laser melting technology;
[0033] (2) Carry out the first hot isostatic pressing under the conditions of a pressure of 80MPa, a temperature of 900°C, and a time of 2.5h; perform a second hot isostatic pressing under the conditions of a pressure of 80MPa, a temperature of 700°C, and a time of 9h;
[0034] (3) The processed additively manufactured GH4169 nickel-based superalloy was air-cooled to room temperature, and the cooling rate was 70°C / s.
[0035] The processed additively fabricated GH4169 nickel-based superalloy was observed by scanning electron microscopy, as figure 2 As shown, the precipitation of γ″ and σ phases can be clearly seen.
[0036] The processed additively manufactured GH4169 nickel-based superalloy was cut into block samples and tensile samples with a wire cutting machine, and the samples were ground and polished to test the density and mechanical properties. The test results are shown i...
Embodiment 2
[0038] (1) GH4169 nickel-based superalloy was prepared by selective laser melting technology;
[0039] (2) Carry out the first hot isostatic pressing under the conditions of a pressure of 90MPa, a temperature of 800°C, and a time of 3h; carry out the second hot isostatic pressing under the conditions of a pressure of 85MPa, a temperature of 700°C, and a time of 9h;
[0040] (3) The processed additively manufactured GH4169 nickel-based superalloy was air-cooled to room temperature, and the cooling rate was 70°C / s.
[0041] The treated additively manufactured GH4169 nickel-based superalloy was cut into block samples and tensile samples with a wire cutting machine, and the samples were ground and polished to test the density and mechanical properties. The test results are shown in Table 1.
Embodiment 3
[0043] (1) GH4169 nickel-based superalloy was prepared by selective laser melting technology;
[0044] (2) Carry out the first hot isostatic pressing under the conditions of a pressure of 80MPa, a temperature of 1000°C and a time of 3.5h; perform a second hot isostatic pressing under the conditions of a pressure of 90MPa, a temperature of 720°C and a time of 10h;
[0045] (3) The processed additively manufactured GH4169 nickel-based superalloy was air-cooled to room temperature, and the cooling rate was 70°C / s.
[0046] The treated additively manufactured GH4169 nickel-based superalloy was cut into block samples and tensile samples with a wire cutting machine, and the samples were ground and polished to test the density and mechanical properties. The test results are shown in Table 1.
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