Heat treatment method for realizing grain boundary serration of nickel-based superalloy forge piece
A technology of nickel-based superalloy and heat treatment method, which is applied in the field of heat treatment to realize serration of grain boundaries of nickel-based superalloy forgings, can solve the problems of unclear formation mechanism and different formation mechanisms of serrated grain boundaries, and achieve optimized grain boundary characteristics. Distribution, ease of implementation, effect of improving grain boundary strength
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Embodiment 1
[0034] In the present embodiment, the heat treatment (abbreviation: controlled cooling heat treatment) is performed on the Inconel 617 nickel-based superalloy forging after forging, and the part of the straight random grain boundary is transformed into a sawtooth grain boundary, and the average amplitude of the sawtooth grain boundary is is 1μm, and the specific implementation process is:
[0035] 1. Place the forged Inconel 617 nickel-based superalloy forging in a heat treatment furnace, and keep the temperature at 1050-1200°C (1200°C in this embodiment) for 0.5-4h (1h in this embodiment);
[0036] 2. Place the Inconel 617 nickel-based superalloy forging after the heat preservation treatment in step 1 in a heat treatment furnace, and cool it to 650-800°C (750°C in this embodiment) at a certain cooling rate, and the cooling rate is 1-20°C / min (10°C / min in this example), and keep the temperature for 1-8h (8h in this example);
[0037] 3. Take out the Inconel 617 nickel-based ...
Embodiment 2
[0044] It is basically the same as Example 1, the difference is that the controlled cooling heat treatment process adopts 1100 °C for 1.5 hours, then cools to 700 °C at a cooling rate of 6 °C / min, keeps for 6 hours, takes out water and cools to room temperature, and saw teeth in the alloy. The grain boundary average amplitude was 1.1 μm.
[0045]The Inconel 617 nickel-based superalloy with the same chemical composition as in Example 1 was used for controlled cooling and heat treatment. The alloy was placed in a heat treatment furnace, kept at 1100 °C for 1.5 h, then cooled to 700 °C at a cooling rate of 6 °C / min, held for 6 h, and then taken out and cooled to room temperature. The grain boundary structure analysis was carried out by SEM, and the results showed that the average amplitude of sawtooth grain boundaries in the alloy was 1.1 μm. The Inconel 617 nickel-based superalloy forgings after controlled cooling and heat treatment were processed into M10 rod-shaped tensile sa...
Embodiment 3
[0050] It is basically the same as Example 1, the difference is that the controlled cooling heat treatment adopts 1150 °C for 1 h, and then cools to 650 °C at a cooling rate of 8 °C / min and keeps it for 4 h, and then takes out water and cools to room temperature. The average amplitude was 1.2 μm.
[0051] The Inconel 617 nickel-based superalloy with the same chemical composition as in Example 1 was used for controlled cooling and heat treatment. The alloy was placed in a heat treatment furnace, kept at 1150 °C for 1 h, then cooled to 650 °C at a cooling rate of 8 °C / min, held for 4 h, and then taken out and cooled to room temperature. The grain boundary structure analysis was carried out by SEM, and the results showed that the average amplitude of sawtooth grain boundaries in the alloy was 1.2 μm. The Inconel 617 nickel-based superalloy after controlled cooling and heat treatment was processed into an M10 rod-shaped tensile sample, and the mechanical properties were tested wi...
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