δ相对GH4169合金热变形行为的影响  

Influence of δ Phase on Hot Deformation Behavior of GH4169 Alloy

作　　者：韦家虎[1,2] 董建新[1] 喻健[2] 姚志浩[1] 付书红[2] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]北京航空材料研究院,北京100095

出　　处：《航空材料学报》2012年第6期72-77,共6页Journal of Aeronautical Materials

摘　　要：对GH4169合金进行四种不同工艺的热处理以得到不同的δ相析出状态,采用Gleeble-1500试验机在980℃下测试合金热变形特性。结果表明,GH4169合金经不同热处理后可获得不同初始状态的δ相含量及分布状态,合金中δ相的增加将降低合金变形抗力;δ相的存在促进变形合金再结晶形核和长大;晶界δ相的存在有利于热变形过程中的再结晶,而晶内δ相则阻碍形核过程;预先析出的δ相在变形过程中发生溶解。In order to reveal the influent of δ phase on the hot deformation behavior of GH4169 alloy, various δ phase sizes and distri- bution,obtained by the different heat treatment, were investigated. Then, those different samples were hot deformed at 980℃ using Gleeble-1500 hot compression testing machine. The effect of pre-precipitated δ phase on hot deformation mechanism and microstructure after deformation of GH4169 alloy was systematically studied. The results show that the amount and distribution of δ phase significantly affect microstructure evolution and recrystallization behavior during hot deformation. The amount of δ phase increases, the stress of de- formation reduce. Besides, δ phase promotes the nucleation and growth of recrystallization grains, especially δ precipitation in grain boundary. Furthermore, hot deformation accelerates the dissolution of pre-precipitated δ phase during deformation at 980℃.

关 键 词：GH4169 热处理 Δ相 热变形 

分 类 号：V223[航空宇航科学与技术—飞行器设计] V215.5