Effects of Deformation Processing Parameters on the Microstructure Evolution and Microhardness of GH4169 Superalloy during Annealing Treatment
Effects of Deformation Processing Parameters on the Microstructure Evolution and Microhardness of GH4169 Superalloy during Annealing Treatment
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DOI：
10.1002/adem.202100104
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发表时间：
2021-05
影响因子：
3.6
通讯作者：
Guan-Qiang Wang;Ming-Song Chen;Yongcheng Lin;Hong-bin Li;Yanyong Ma;Zong-Huai Zou;Quan Chen
中科院分区：
文献类型：
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作者：
Guan-Qiang Wang;Ming-Song Chen;Yongcheng Lin;Hong-bin Li;Yanyong Ma;Zong-Huai Zou;Quan Chen
分析了变形加工参数对退火处理过程中变形样品显微组织演变和显微硬度的影响。结果表明，与其他工艺参数相比，初始时效时间对退火晶粒细化的影响最大。这归因于随着初始时效时间的延长，更多的δ相沉淀出来。高含量的δ相阻碍了退火过程中快速动态再结晶（DRX）晶粒长大。因此，由于变形后保留的δ相含量高，高应变速率有助于通过退火处理细化变形晶粒。此外，再结晶核/晶粒的大量出现也阻碍了相邻晶粒的生长。在高变形温度或真应变下，虽然δ相的溶解有所增强，但大量DRX核的出现将导致退火晶粒细化。因此，在950-1010℃下变形的晶粒在退火过程中可以细化至11-14μm。此外，高真应变有利于在退火过程中获得细小且均匀的微观结构，因为高变形能促进静态再结晶（SRX）成核。此外，由于细晶和γ”相强化，GH4169高温合金的显微硬度取决于晶粒尺寸和δ相的残留含量。
Effects of deformation processing parameters on the microstructural evolution and microhardness of deformed samples during annealing treatment were analyzed. The results show that the initial aging time has the greatest influence on the refinement of annealed grain compared with other processing parameters. This attributes to more δ phases precipitating with the improving initial aging time. The high content of δ phase hinders the quick dynamic recrystallization (DRX) grain growth during annealing. Thus, the high strain rate helps to refine deformed grain by annealing treatment due to a high content of δ phase retained after deformation. Additionally, the massive appearance of recrystallized nuclei/grains also hinders adjacent grain growth. The appearance of many DRX nuclei at high deformation temperature or true strain will cause the fine annealed grain, although the dissolution of δ phase is enhanced. Thus, the grain deformed at 950–1010 °C can be refined to 11–14 μm during annealing. Furthermore, the high true strain is beneficial to obtain fine and homogeneous microstructure during annealing because the high deformation energy promotes static recrystallization (SRX) nucleation. Besides, the microhardness of GH4169 superalloy depends on the grain size and retained content of δ phase due to the fine‐grain and γ″ phase strengthening.