DD6单晶叶片的γ′相演化  

Evolution ofγ′phase in DD6 single crystal turbine blade

作　　者：薛燕鹏 杨亮 喻健 刘世忠 李嘉荣 XUE Yanpeng;YANG Liang;YU Jian;LIU Shizhong;LI Jiarong(AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing 100095,China)

机构地区：[1]中国航发北京航空材料研究院,北京100095 [2]先进高温结构材料重点实验室,北京100095

出　　处：《航空材料学报》2020年第6期8-15,共8页Journal of Aeronautical Materials

摘　　要：采用扫描电子显微镜(SEM)等手段研究DD6单晶涡轮叶片典型截面的γ′相演化规律。结果表明:与铸态组织相比,热处理态叶片各典型截面枝晶间区域的γ′相尺寸显著细化,枝晶间和枝晶干区域的γ′相尺寸趋于一致,分散度趋向减小,γ′相立方化程度提高;叶片各截面枝晶干和枝晶间区域的铸态和热处理态γ′相的尺寸均遵循正态分布规律;热处理态叶片叶身截面γ′相尺寸小于榫头,叶身截面中部位置γ′相尺寸大于前缘、尾缘γ′相尺寸。The evolution rule ofγ′phase in typical cross sections of DD6 single crystal superalloy turbine blade was investigated experimentally by SEM.The results show that comparing with the as-cast microstructures,theγ′phase sizes of typical cross sections in the interdendrite regions of the heat-treated turbine blade are obviously refined,theγ′phase sizes of the interdendritic(ID)region and dendritic core(DC)tended to be the same,and theγ′phase size dispersion tended to decrease,theγ′phases cubed degree increased.The sizes of as-cast and heat-treatedγ′phase in the dendrite core and interdendritic region of each cross section of the blade follow the normal distribution law.The size ofγ′phase in the section of the heat-treated blade is smaller than that of the tenon,and the size of theγ′phase in the middle of the section is larger than that of the leading edge and trailing edge.

关 键 词：镍基高温合金 DD6 单晶涡轮叶片 γ′相 

分 类 号：TG132.3[一般工业技术—材料科学与工程]