Ni添加量对Co-Al-W基单晶高温合金凝固特性的影响  

Effect of Ni addition amount on solidification characteristics of Co-Al-W based single crystal superalloy

作　　者：艾诚 王国鑫 陈曦 郭敏[3] 黄太文[3] 刘林[3] 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)

机构地区：[1]长安大学材料科学与工程学院,西安710064 [2]西安赛特思迈钛业有限公司,西安710018 [3]西北工业大学凝固技术国家重点实验室,西安710072

出　　处：《中国有色金属学报》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)。

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.

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 

分 类 号：TG132.32[一般工业技术—材料科学与工程]