锯齿状
晶界
高温合金
材料科学
晶界强化
冶金
等温过程
合金
复合材料
热力学
微观结构
物理
作者
Shuo Huang,Wenyun Zhang,Bingchao Xie,Hao Yu,Yongquan Ning,Beijiang Zhang
出处
期刊:Metals
[MDPI AG]
日期:2022-09-14
卷期号:12 (9): 1521-1521
被引量:3
摘要
Heat treatments, including solution treatment and isothermal heat treatment, were conducted to investigate the grain boundary serration of GH4975 superalloy. The two different heat treatment processes could both promote the formation of serrated grain boundaries within the present temperature and soaking time ranges, provided that the cooling rates were controlled to be quite slow. The samples subjected to furnace cooling exhibited a more obvious serrated grain boundary morphology by comparison with those subjected to air cooling. The interaction between precipitated phases and grain boundaries was focused to explore the formation mechanisms of serrated grain boundaries within GH4975 superalloy. Heat treatment temperature and soaking time strongly affected the morphology and size of precipitated phases, and consequently influenced the formation of serrated grain boundaries. The directional growth of grain boundary precipitates and its pinning effects on the migration of grain boundaries also affected the grain boundary morphology.
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