表面再结晶对DD5镍基单晶高温合金组织和力学性能的影响  

Effect of Surface Recrystallization on Microstructure and Mechanical Properties of Nickel Base Single-crystal Superalloy DD5

作　　者：李志强[1] 黄朝晖[1] 谭永宁[1] 张强[1] 张宏炜[1] 贾新云[1] 王艳丽[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》2011年第5期1-5,共5页Journal of Aeronautical Materials

摘　　要：在不同的热处理温度和变形条件下,研究了二代单晶DD5合金的再结晶组织随温度的变化规律以及对力学性能的影响。结果表明,经过吹砂处理后的试样,在高于1050℃热处理后就出现了再结晶,初始再结晶以胞状组织呈现,随着热处理温度的提高,再结晶逐渐转变为再结晶晶粒层;干吹砂后的再结晶层明显比水吹砂的厚。研究发现,含有再结晶层试样的拉伸和持久性能较标准试样有不同程度的下降,其下降程度随着试验温度升高而增加。The evolution of recrystallized microstructure and the change of mechanical properties with different heat-treatment temperature and deformation were studied for the second generation single crystal superalloy DD5.The results showed that the recrystallization occurred in the grit blasted sample at heat-treatment temperatures higher than 1050°C.At the initial stage the recrystallization texture was characterized by cellular morphology of recrystallization,and then,with the increase of heat-treatment temperature,it was transformed into recrystallized layer.The recrystallization depth for grit blasted samples was thicker than water-grit blasted ones.It was found that the tensile property and stress-rupture property of the superalloy DD5 was decreased with the recrystallized layer,and the higher the heat-treatment temperature,the stronger the decreasing extent.

关 键 词：单晶高温合金 DD5 再结晶组织 力学性能 

分 类 号：TG146.1[一般工业技术—材料科学与工程]