第二代定向高温合金DZ6热处理研究  

Study on Heat Treatment of Second Generation DS Superalloy DZ6

作　　者：黄朝晖[1] 贾新云[1] 谭永宁[1] 张宏炜[1] 张强[1] 张俊[1] 唐定中[1] 

机构地区：[1]北京航空材料研究院先进高温结构材料国防科技重点实验室,北京100095

出　　处：《航空材料学报》2008年第6期1-4,共4页Journal of Aeronautical Materials

摘　　要：为了获得平衡的横纵向性能,二代定向合金DZ6的热处理工艺包括预处理、固溶和三级时效。1120℃的高温时效处理提高了DZ6合金的纵、横向持久寿命;同时,1120℃时效后的缓冷处理,使横向870℃/448MPa持久寿命由未经缓冷处理的36h增加至244h,延伸率由0.6%提高至4.5%;中温870℃/16h时效处理使合金纵向760℃/780MPa持久寿命比900℃/4h时效处理时提高一倍。热处理后γ′呈规则立方状,合金的晶界由γ′和析出的块状MC组成。以高温时效结合缓冷处理为特点的热处理制度,不但使DZ6合金的纵向持久寿命比铸态时提高一倍,而且还获得了良好的横向性能。The heat treatment process of the 2^nd DS superalloy DZ6 （Re-bearing）includes pre-treatment, solution and three-stage aging. The experimental results show that the longitudinal and transverse stress rupture life are improved by adding the first stage aging at 1120℃. Meanwhile, the transverse rupture life at the condition of 870℃/448MPa and the elongation rate of the alloy are increased remarkably from 36 h to 244 h and from 0.6% to 4.5% respectively by aging treatment at 1120℃ followed by slow cooling. The 870℃/ 16 h aging makes longitudinal rupture life at the condition of 760℃/780 MPa to be twice as that for 900℃/4h aging. After the heattreatment the γ′ phase shows cubic shape and the grain boundary consists of γ′and blocky MC. The proposed heat treatment characterized by the combination of high-temperature aging with slow cooling, not only elevates the longitudinal rupture life of the alloy by one time but also contributes to its good transverse property.

关 键 词：定向高温合金 DZ6 铼 热处理 性能 

分 类 号：TG132.33[一般工业技术—材料科学与工程]