Inconel X-750合金中γ′相的粒度分布

doi:10.13251/j.issn.0254-6051.2024.01.010

摘要/Abstract

摘要： 采用扫描电镜、X射线小角散射粒度分析仪结合析出相定量分析方法,对不同固溶冷却速度和不同时效温度下Inconel X-750合金中γ′相的粒度分布进行了研究。结果表明,Inconel X-750合金在1060 ℃×1 h固溶后采用水冷、油冷、空冷和炉冷时,由于水冷和油冷的冷速较快,抑制了合金中γ′相的析出,在随后的670 ℃×15 h时效后,γ′相粒子尺寸大部分集中在5~18 nm;而炉冷过程中合金析出二次γ′相,时效后,析出的γ′相几乎没有长大,新析出的三次γ′相粒子尺寸为1~5 nm,且炉冷后析出的γ′相由快速冷却后的球形向立方形转变。随着时效温度的升高,γ′相粒径逐渐长大,其平均粒径从690 ℃时效的11.5 nm长大到810 ℃时效的34.4 nm,且γ′相粒子长大符合Ostwald 熟化机制。随着冷却速度的降低,尺寸在1~60 nm范围内的γ′相粒子质量分数逐渐增加是合金强度增加的主要原因;而随着冷却速度的降低,M₂₃C₆相在晶界处逐渐长大、粗化并连接成条状,导致合金的冲击性能下降。

关键词: Inconel X-750合金, γ′相, 粒度分布, Ostwald熟化机制

Abstract: Particle size distribution of γ′ phase precipitate in Inconel X-750 alloy after solution treatment with different cooling rates and aging at different temperatures was investigated by means of scanning electron microscope, X-ray small angle scattering particle size analyzer combined with quantitative analysis of precipitates. The results show when the Inconel X-750 alloy is solution treated at 1060 ℃ for 1 h with water cooling, oil cooling, air cooling and furnace cooling, respectively, due to the fast cooling rate of water cooling and oil cooling, the precipitation of γ′ phase in the alloy is inhibited, and the size of γ′ phase particles is mostly concentrated in the range of 5-18 nm after subsequent aging at 670 ℃ for 15 h. While the secondary γ′ phase precipitated in the alloy after solution treatment with furnace cooling is hardly grows after aging, the newly precipitated tertiary γ′ phase particle size is in the range of 1-5 nm, and the precipitated γ′ phases in the alloy transform from spherical to cubic. With the increase of aging temperature, the size of the γ′ phase particles gradually increases, as its average diameter grows from 11.5 nm aged at 690 ℃ to 34.4 nm aged at 810 ℃, and the growth of the γ′ phase particles is consistent with Ostwald ripening mechanism. With the decrease of cooling rate, the mass fraction of γ′ phase particles with the size of 1-60 nm gradually increases, which is the main reason for the strength increase of alloy. However, with the decrease of cooling rate, M₂₃C₆ phase gradually grows and coarsens at the grain boundary and connects into strips, resulting in a decrease in the impact property of the alloy.

Key words: Inconel X-750 alloy, γ′ phase, particle size distribution, Ostwald ripening mechanism

中图分类号:

TG146.15

罗磊, 王立民. Inconel X-750合金中γ′相的粒度分布[J]. 金属热处理, 2024, 49(1): 69-75.

Luo Lei, Wang Limin. Particle size distribution of γ′ phase precipitate in Inconel X-750 alloy[J]. Heat Treatment of Metals, 2024, 49(1): 69-75.

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