TY - JOUR
T1 - Microstructure evolution of directionally solidified DZ125 superalloy with melt superheating treatment
AU - Wang, Changshuai
AU - Zhang, Jun
AU - Liu, Lin
AU - Fu, Hengzhi
PY - 2010/10/22
Y1 - 2010/10/22
N2 - The melt superheating treatment is carried out for DZ125 superalloy during directional solidification. Under the same thermal gradient and solidification velocity, the microstructure evolution of directionally solidified DZ125 superalloy is systematically investigated by changing the melt superheating temperature. The results show that the dendrite is refined with the melt superheating temperature increasing from 1500 °C to 1650 °C. However, it becomes coarse after the melt superheating treatment at 1750 °C. The dendrite segregation first reduces with the increase of melt superheating temperature between 1500 °C and 1650 °C, but becomes more severe when the superheating temperature is higher than 1650 °C. The carbide morphology presents script-like when the melt superheating temperature is below 1600 °C. Further increasing the melt superheating temperature, it is mainly blocky and nodular. Moreover, the reason of microstructure evolution with melt superheating treatment is discussed. The results are useful for promoting the development of high quality directionally solidified superalloy.
AB - The melt superheating treatment is carried out for DZ125 superalloy during directional solidification. Under the same thermal gradient and solidification velocity, the microstructure evolution of directionally solidified DZ125 superalloy is systematically investigated by changing the melt superheating temperature. The results show that the dendrite is refined with the melt superheating temperature increasing from 1500 °C to 1650 °C. However, it becomes coarse after the melt superheating treatment at 1750 °C. The dendrite segregation first reduces with the increase of melt superheating temperature between 1500 °C and 1650 °C, but becomes more severe when the superheating temperature is higher than 1650 °C. The carbide morphology presents script-like when the melt superheating temperature is below 1600 °C. Further increasing the melt superheating temperature, it is mainly blocky and nodular. Moreover, the reason of microstructure evolution with melt superheating treatment is discussed. The results are useful for promoting the development of high quality directionally solidified superalloy.
KW - Crystal growth
KW - High-temperature alloys
KW - Microstructure
KW - Scanning electron microscopy
UR - http://www.scopus.com/inward/record.url?scp=77957863013&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2010.08.086
DO - 10.1016/j.jallcom.2010.08.086
M3 - 文章
AN - SCOPUS:77957863013
SN - 0925-8388
VL - 508
SP - 440
EP - 445
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
IS - 2
ER -