摘要
基于实验研究、热力学计算与动力学分析,研究了Ni含量对Co-Al-W基单晶高温合金凝固特性的影响。结果表明:无Ni和添加Ni的Co基单晶高温合金均具有典型的枝晶组织,但Ni的添加增大了合金的一次枝晶间距。同时,Ni的添加增大了Al和W元素的显微偏析倾向,降低了Ta元素的显微偏析倾向,但对Ti元素的显微偏析倾向的影响较小。无Ni合金的枝晶间析出相为初生γ′相和(β+γ′)共晶相,而含Ni合金的枝晶间析出相为初生γ′相,即Ni的添加改变了合金的凝固路径与铸态组织。同时,Ni的添加对Co-Al-W基单晶高温合金凝固特征温度的影响不明显。
The effect of Ni addition on solidification characteristics of Co-Al-W based single crystal superalloy was investigated via experimental,thermodynamical and dynamical analysis.Both Ni-free and adding Ni Co-Al-W based single crystal superalloy has the typical dendritic microstructure,and Ni addition increases the primary dendritic arm spacing of single crystal superalloy.Meanwhile,with increasing Ni content,the microsegregation degrees of Al and W elements increase,the microsegregation degree of Ta element decreases,while Ni addition has little influence on the microsegregation degree of Ti element.Moreover,the interdendritic precipitations of Ni-free single crystal superalloy are primaryγ′phase and(β+γ′)eutectic phase,while the interdendritic precipitation of Ni single crystal superalloy is primaryγ′phase,which indicates that Ni addition changes the solidification path and as-cast microstructure of single crystal superalloy.In addition,the influence of Ni addition on solidification characteristic temperatures of Co-Al-W based single crystal superalloy is not obvious.
作者
艾诚
王国鑫
陈曦
郭敏
黄太文
刘林
AI Cheng;WANG Guo-xin;CHEN Xi;GUO Min;HUANG Tai-wen;LIU Lin(School of Materials Science and Engineering,Chang’an University,Xi’an 710064,China;Xi’an SaiteSimai Titanium Industry Co.,Ltd.,Xi’an 710018,China;State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an 710072,China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2022年第10期2977-2988,共12页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(52071267,51971174)
中央高校基本科研业务费(300102311401)。
关键词
Ni添加量
Co-Al-W基单晶高温合金
枝晶组织
显微偏析
凝固路径
凝固特征温度
Ni addition amount
Co-Al-W based single crystal superalloy
dendritic microstructure
microsegregation behavior
solidification path
solidification characteristic temperatures
作者简介
通信作者:艾诚,副教授,博士,电话:029-82337345,E-mail:aicheng@chd.edu.cn。
