熔体超温处理对镍基单晶高温合金γ′相的细化作用  

Refining Effect of Melt Overheating Treatment on γ′ Phase in Ni-Based Single Crystal Superalloy

作　　者：邹敏明[1] 张军[1] 刘林[1] 傅恒志[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《稀有金属材料与工程》2008年第9期1530-1533,共4页Rare Metal Materials and Engineering

基　　金：国家重点基础研究发展计划项目(2006CB605202)

摘　　要：采用光学显微镜、扫描电镜等方法研究了熔体超温处理对镍基单晶高温合金γ′相的影响。结果表明,随熔体超温处理温度由1500℃升高至1640和1780℃时,一次枝晶间距由177μm分别减小至150和125μm;枝间Ti富集程度降低,W的偏析程度减小。枝晶干和枝晶间γ′相尺寸均减小,枝间γ′相由不规则转变成立方形,同时枝间与枝干区域γ-γ′错配度减小。Using microscope and scanning electron microscopy, the effect of melt overheating treatment on the size and morphology of γ＇ phase in Ni-based single crystal superalloy is studied in this paper. The results show that as the melt overheating temperature increases from 1500 ℃ to 1640 ℃ and 1780 ℃, the primary arm spacing decreases from 177 μm to 150 μm and 125 μm respectively. Meanwhile, Ti enrichment in the interdendrite area and W segregation are all decreased. It can be seen that γ＇ phase in both dendrite trunk and interdendrite area are all refined while the morphology of γ＇ phase in interdendrite area become cubic. The calculation result shows that the γ-γ＇ mismatches both in dendritic trunk and interdendrite area are all gradually decreased.

关 键 词：熔体超温处理 DD3单晶高温合金 γ’相 错配度 

分 类 号：TG132.32[一般工业技术—材料科学与工程]