摘要
采用等温凝固和差热分析相结合的方法,研究Hf含量对定向凝固柱晶IC10高温合金凝固特性的影响,得到Hf含量变化时合金在不同温度的凝固组织和凝固顺序。结果表明:随着Hf含量增加,合金的液相线及固相线温度均降低,凝固温度范围扩大,γ+γ'共晶析出温度提高。增加Hf含量还缩小了枝晶间丧失补缩能力温度与固相线温度的温度范围,并降低枝晶间液池保持连通时所需的最小液体量,提高IC10合金的铸造性能。
The effect of hafnium on the solidification characterization of IC10 superalloy was studied by the method of DSC and isother- mal solidification experiment. The solidified structure at different temperature and solidification sequence were obtained. It is found that with the increasing hafnium content,temperatures of liquidus and solidus decrease, in the same time, the solidification range of the al- loy and the temperature of euteetie increase . Hafnium narrowed down the temperature range between the lost of interdendritie capillary feeding action and solidus, as well as decreased the liquid content necessary for linking the interdendritie pools in the late solidifica- tion. The Hf-rich melts in interdendritic zone had superior fluidity. So the increasing of hafnium content increased the castability of IC10 superalloy.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2012年第6期50-55,共6页
Journal of Aeronautical Materials
关键词
高温合金
定向凝固
HF
微观组织
superalloy
directional solidification
Hf
microstructure
