( 1. 北京科技大學(xué) 材料科學(xué)與工程學(xué)院， 北京 100083;
2. 寧夏大學(xué) 物理與電氣信息工程學(xué)院， 銀川 750021)
摘 要: 對熱等靜壓FGH95合金高溫擠壓形變后的試樣進行靜態(tài)再結(jié)晶處理，討論了其再結(jié)晶形核機制及γ′相對再結(jié)晶過程的影響。 結(jié)果表明： 合金在γ′相幾乎完全溶解溫度以上再結(jié)晶時， 形核以應(yīng)變誘發(fā)晶界遷移機制進行， 而在γ′相大量存在的溫度范圍內(nèi)則是以亞晶粗化形核機制進行； γ′相的分解速率對再結(jié)晶速率有重要影響，隨再結(jié)晶溫度的升高， γ′相分解速率加快， 再結(jié)晶激活能減小， 再結(jié)晶速率加快， γ′相分解后以同步或不同步方式重新析出。
關(guān)鍵字: FGH95高溫合金；靜態(tài)再結(jié)晶； 形核機制
JIN Kai-sheng1, LI Hui-ying1
（ 1. School of Materials Science and Engineering,
University of Science and Technology Beijing, Beijing 100083, China;
2. School of Physics and Electrical Information Engineering,Ningxia University,
Yinchuan 750021, China）
Abstract: The as-HIPed FGH95 alloy was deformed by extrusion at high temperature, and then the as-extruded sample was treated with static recrystallization. The nucleation mechanism and the influence of γ′ phase on recrystallization process during static recrystallization were also discussed. The results indicate that the nucleation mechanism is strain-induced boundary migration (SIBM) when alloy is treated near the temperature at which γ′ phase can be dissolved completely, and it is sub-grain coalescence when alloy is treated at the temperature at which a lot of γ′ phase exist. The γ′ phase decomposition rate has an important influence on the recrystallization rate. With the recrystallization temperature increasing, the γ′ phase decomposition rate increases and the activation energy of recrystallization decreases, resulting in recrystallization rate to increase. The γ′ phase re-precipitates in recrystallized grains by synchronization or non-synchronization.
Key words: FGH95 superalloy; static recrystallization; nucleation mechanism
