TY - JOUR
T1 - Influence of withdrawal rate on the microstructure of Ni-base single-crystal superalloys containing Re and Ru
AU - Liu, Gang
AU - Liu, Lin
AU - Ai, Cheng
AU - Ge, Bingming
AU - Zhang, Jun
AU - Fu, Hengzhi
PY - 2011/5/12
Y1 - 2011/5/12
N2 - The influence of elevated withdrawal rate on the microstructure and segregation behavior of Ni-base single-crystal superalloys containing Re and Ru is investigated. The experimental superalloys are processed under a high thermal gradient of approximately 250 K/cm and withdrawal rates between 10 and 500 μm/s. With increasing withdrawal rate, the dendritic structures and γ′ precipitates in as-cast microstructures are apparently refined. Electron-probe microanalyzer (EPMA) results indicate that the degree of segregation for the constituent elements (e.g. Al, Ta, W, Re etc.) increases initially and then decreases with increasing withdrawal rate. In addition, the Re and Ru additions obviously increase the amounts of γ-γ′ eutectic and the tendency of segregation for Al and Ta.
AB - The influence of elevated withdrawal rate on the microstructure and segregation behavior of Ni-base single-crystal superalloys containing Re and Ru is investigated. The experimental superalloys are processed under a high thermal gradient of approximately 250 K/cm and withdrawal rates between 10 and 500 μm/s. With increasing withdrawal rate, the dendritic structures and γ′ precipitates in as-cast microstructures are apparently refined. Electron-probe microanalyzer (EPMA) results indicate that the degree of segregation for the constituent elements (e.g. Al, Ta, W, Re etc.) increases initially and then decreases with increasing withdrawal rate. In addition, the Re and Ru additions obviously increase the amounts of γ-γ′ eutectic and the tendency of segregation for Al and Ta.
KW - Crystal growth
KW - High-temperature alloys
KW - Microstructure
KW - Scanning electron microscopy
UR - http://www.scopus.com/inward/record.url?scp=79953774867&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2011.02.156
DO - 10.1016/j.jallcom.2011.02.156
M3 - 文章
AN - SCOPUS:79953774867
SN - 0925-8388
VL - 509
SP - 5866
EP - 5872
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
IS - 19
ER -