中国铸造2010，Vol.7Issue(3)：217-223,7.
Effect of solidification parameters on the microstructures of a single crystal Ni-based superalloy AM3
Effect of solidification parameters on the microstructures of a single crystal Ni-based superalloy AM3
摘要
Abstract
A single crystal Ni-based superalloy AM3 was processed at withdraw rates of 3.5, 10, 50, 100, 200, and 500 IJm-s-1, respectively. The as-cast microstructures and solidification segregation ratio were characterized with various withdraw rates. The shape and size of carbide microstructuras were determined. As expected, the primary and secondary dendrite arm spacings (PDAS and SDAS) decrease with the increase of withdraw rate. The highest volume fraction of eutectic γ/γ' is observed at the 100 μm·s-1 withdraw rate. The volume fraction of eutectic γ/γ' does not appear to be a strong function of the withdraw rate. With increasing withdraw rate, interface morphologies change in the sequence of planar, cellular, and dendrite. There is a general refinement of the microstructure as the withdraw rate increases. EPMA analysis showed that withdraw rate does not have obvious influence on the segregation of elements.关键词
Ni-based superalloy/single crystal/withdraw rate/solidification/PDAS/SDASKey words
Ni-based superalloy/single crystal/withdraw rate/solidification/PDAS/SDAS分类
矿业与冶金引用本文复制引用
Yu Zhuhuan,Liu Lin,Zhao Xinbao,Zhang Weiguo,Zhang Jun,Fu Hengzhi..Effect of solidification parameters on the microstructures of a single crystal Ni-based superalloy AM3[J].中国铸造,2010,7(3):217-223,7.基金项目
The study was financially supported by the National Natural Science Foundation of China (Grant No. 50771081,50931004), and the National Basic Research Program of China (2010CB631202). （Grant No. 50771081,50931004）
