Surface recrystallization of a Ni_3Al based single crystal superalloy at different annealing temperatures and blasting pressure

• 来源期刊: 稀有金属(英文版)
• 学科: 工学
• 年，卷（期）: 2012,（3）
• 页码范围: 209-214
• 页数: 6页
• 分类号: TG132.32
• 语种: 中文

摘要

The effects of annealing temperature and grit blasting pressure on the recrystallization behavior of a Ni3Al based single crystal superalloy were studied in this work. The results show that the precipitation of the Y-NiMo phase occurs at 900 and 1000 °C, which precedes recrystallization. The initial recrystallization temperature was between 1000 and 1100 °C. Cellular recrystallization was formed at 1100 and 1200 °C, which consisted of large columnar γ′ and fine γ + γ′. The dendrite arm closed to the interdendritic region may act as nucleation sites during initial recrystallization by a particle simulated nucleation mechanism at 1280 °C. The size of the grains first turned large and then became small upon the pressure while the recrystallization depth increased all the time.