Inconel 751合金长期时效过程中γ′析出相的长大行为  

Growth Behavior of γ′ Precipitation Particles in Inconel 751 During Long Term Aging Treatment

作　　者：李佃国[1] 尹法杰[2] 陈明元[1] 李长荣[1] 

机构地区：[1]北京科技大学材料学院,北京100083 [2]钢铁研究总院高温材料研究所,北京100081

出　　处：《金属热处理》2005年第11期25-28,共4页Heat Treatment of Metals

摘　　要：对经过标准热处理的Inconel 751合金,在700℃和850℃进行了长期时效处理。对长期时效处理后的合金组织进行了观察,采用Thermo-calc软件对合金γ′相的析出进行了热力学验证计算。结果表明,Inconel 751合金在700℃时效时,γ′相长大较为缓慢,而在850℃时效时γ′相迅速长大;随着时效温度的升高和保温时间的延长,合金中小颗粒γ′相数量减少,单位面积内的γ′颗粒数目减少,大γ′颗粒数目增加,即发生了Ostwald熟化;Inconel751合金中γ′相主要为N i3(A l,Ti),在700℃和850℃时效过程中,γ′颗粒长大受A l和Ti扩散控制。Microstructure character of γ＇ precipitation and the corresponding thermodynamic calculation in superalloy Inconel 751 during long term aging treatment was studied. The results show that the growth rate of γ＇ precipitation particles in superalloy Inconel 751 at 700℃ is slower than that at 850℃. With the increase of temperature and time,the quantity of small γ＇ particles decreases as well the quantity of big γ＇ particles increases because of the Ostwald coarsening. The constitution of γ＇ precipitation is Ni3 （Al, Ti ） in superalloy Inconel 751, γ＇ precipitation behaviour is controlled by the diffusion of Al and Ti elements.

关 键 词：高温合金 长期时效 γ’相 Ostwald熟化 热力学计算 

分 类 号：TG132.3[一般工业技术—材料科学与工程]