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《中国航空学报(英文版)》 1995-04
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EFFECT OF SOLIDIFICATION RATE ON MICRO-STRUCTURES OF DIRECTIONALLYSOLIDIFIED SUPERALLOY DZ22

Liu Zhongyuan; Li Jianguo; Shi Zhengxing; Fu Heiizhi,(Northwestern Polytechnical University, Xi'an, China, 710072)She Li; Chen Rongzbang; Wang Luohao(Beijing institute of Aeronautical Materials, Beijing, China, 100095)  
The effect of solidification rate on the microstructures of directionallysolidified superalloy DZ22 was studied with the help of a ZMLMC directionalsolidification apparatus which has a superhigh temperature gradient. The results showthat the size and shapes of Y', (Y+Y') and MC change seriously with the increase in cool-ing rate. When the cooling rate is equal to 54.2K . s-1, Y' particles distnbute evenly;eutectic (Y+Y') in group block and MC in block are distributed in the interdendriticzone.
【CateGory Index】: V214
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