Precipitation characteristics of γ' precipitates of the GH4742 nickel-based superalloy at a slow cooling rate

方向错误 高温合金 材料科学 晶界 降水 电子背散射衍射 扫描电子显微镜 变形(气象学) 形态学(生物学) 冶金 结晶学 复合材料 微观结构 地质学 化学 古生物学 气象学 物理
作者
Wenwen Zhang,Xingang Liu,Mengying Zhu,Ying Guo,Heyong Qin,Qiang Tian
出处
期刊:Journal of Alloys and Compounds [Elsevier BV]
卷期号:941: 169013-169013 被引量:3
标识
DOI:10.1016/j.jallcom.2023.169013
摘要

The double cone samples of the predeformed GH4742 superalloy were treated by subsolid solution heat treatment (Sub-SHT) at 1080 ℃/8 h and then cooled at a cooling rate of 22 ℃/min. The evolution of γ' precipitates by coupling hot deformation and heat treatment was studied by in situ electron backscatter diffraction + scanning electron microscopy. This research explains the morphological variations between the recrystallized and deformed grains of the γ' precipitates, as well as the relationship between the characteristics of the grain boundaries (GBs) and γ' precipitates at the GBs. The results show that when the predeformed samples were subjected to an 8 h Sub-SHT and then cooled at 22 ℃/min, the γ' precipitates exhibit a tri-modal size distribution, and the primary γ' precipitates are dendritic. The morphology of γ' precipitates within deformed grains is related to the accumulation of dislocations and other defects. The maximum size of columnar γ' precipitates is obtained at the high-angle grain boundary, where the misorientation ranges from 30° to 40°. The length of columnar γ' precipitates results from the comprehensive effect of the GB energy determined by the GB misorientation and the GB mobility determined by the stored energy difference. Owing to the low energy and low mobility of the Σ3 twin boundary, the γ' precipitates at the Σ3 twin boundaries remain stable, and the morphology and size are no different from those within the grains. These findings may be helpful for the design and optimization of Ni-base superalloys.
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