Kinetics and microstructural evolution during recrystallization of a Ni3Al-based single crystal superalloy

来源期刊:中国有色金属学报(英文版)2012年第9期

论文作者:武雨潇 张恒 李福林 李树索 宫声凯 韩雅芳

文章页码:2098 - 2105

关键词:再结晶;动力学;Y-NiMo相;Ni3Al基单晶高温合金

Key words:recrystallization; kinetics; Y-NiMo phase; Ni3Al based single crystal superalloy

摘    要:研究了一种Ni3Al基单晶高温合金的再结晶动力学及组织变化,解释了造成枝晶干和枝晶间再结晶行为不一致的原因。 单晶合金经表面喷砂处理,再在惰性气氛中,于1280℃下退火不同时间形成再结晶晶粒。研究发现:枝晶干再结晶层厚度大于枝晶间再结晶厚度,枝晶干再结晶速率快于枝晶间再结晶速率。在退火过程中,枝晶间有Y-NiMo 相析出,且强烈抑制再结晶。然而,随着时间的延长Y-NiMo 析出相逐渐溶解,且抑制再结晶的作用逐渐减弱,最终,枝晶干再结晶层厚度仍然大于枝晶间再结晶厚度。

Abstract: The recrystallization kinetics and microstructural evolution of a Ni3Al-based single crystal superalloy were presented, especially the different recrystallization behaviors between the dendrite arm and the interdendritic region. The single crystal alloy was deformed by grit blasting. A succeeding annealing under inert atmosphere at 1280℃ for different time led to the formation of recrystallized grains close to the grit blasting surface. It was found that the recrystallization depth and velocity in the dendrite arm were respectively deeper and faster than those in the interdendritic region where the Y-NiMo phase existed. The recrystallization process in the interdendritic region was significantly inhibited by the Y-NiMo precipitates. However, the pinning effect gradually weakened with the annealing time due to the dissolution of the Y-NiMo phase, and the recrystallization depth in the dendrite arm was deeper than that in the interdendritic region.

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