摘要
ＳＯＬＩＤＩＦＩＣＡＴＩＯＮＡＮＤＭＩＣＲＯＳＥＧＲＥＧＡＴＩＯＮＢＥＨＡＶＩＯＲＳＯＦＮＩＣＫＥＬＢＡＳＥＳＩＮＧＬＥＣＲＹＳＴＡＬＳＵＰＥＲＡＬＬＯＹＳＯＬＩＤＩＦＩＥＤＡＴＭＥＤＩＵＭＣＯＯＬＩＮＧＲＡＴＥ①ＤｕＷｅｉ，ＬｉＪｉａｎｇｕｏａｎ...
Single crystal blades have already been used in some advanced engines. An industrially valuable nickelbase single crystal superalloy CMSX2 was solidified at cooling rate from below 1 K/s to 20 K/s. Microstructure and microsegregation were investigated. The results showed that the dendritic arm spacing is highly refined at high cooling rate, the primary dendritic arm spacing can be 35 μm, just as 1/10 as that by conventional HRS processing. With the increase of cooling rate, the microsegregation increases and then decreases. In the superfine columnar dendrite, the γ′ precipitates are very fine; the amount of γ/γ′ eutectic is much fewer and its size is very small.
出处
《中国有色金属学会会刊：英文版》
CSCD
1998年第1期84-88,共5页
Transactions of Nonferrous Metals Society of China
