Effect of solution treatment on structure and properties  of a novel nickel-based superalloy

doi:10.13251/j.issn.0254-6051.2022.03.021

Abstract

Abstract: Effects of different solution time and cooling methods on the γ′ phase and hardness in a novel nickel-based superalloy at 1080 ℃ were studied by means of OM, SEM, DSC and hardness tester. The results show that with the prolongation of the solution time, the size of γ′ phase in the tested alloy decreases under both air-cooling and water-cooling conditions; When the solution time is the same, the size of γ′ phase in the air-cooled specimen is larger than that of the water-cooled specimen, and the hardness value is also higher. This is because under the condition of water cooling, the cooling rate is higher and the degree of supercooling is larger, which reduces the diffusion rate of atoms in the matrix, slowes down the growth of the γ′ phase, and makes the final size smaller. Therefore, the solution time should be less than 16 h, and the cooling method should be air cooling, by which the γ′ phase in the alloy is uniformly distributed, the size is greater than 20 nm, and hardness value of the alloy is higher than 425 HV0.2.

Key words: nickel-based super alloy, solution treatment, cooling method, γ′ phase, hardness

CLC Number:

TG156.1

Cheng Tijuan, Gan Bin, Yu Hongyao, Zhou Haijing, Guo Caiyu, Bi Zhongnan, Du Jinhui. Effect of solution treatment on structure and properties of a novel nickel-based superalloy[J]. Heat Treatment of Metals, 2022, 47(3): 107-112.

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Effect of solution treatment on structure and properties of a novel nickel-based superalloy

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