Zhuangqi HU Huaming WANG Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
110015
,
ChinaY.Murata M.Morinaga Toyohashi University of Technology
,
Toyohashi
,
Aichi
,
440 Japan
材料科学技术（英）
The solidification microstructures and solute segregation of a newly developed hot corrosion resistant single-crystal Ni-base superalloy were investigated with a zone-melting and ultra-high thermal gradient unidirectional solidification apparatus.Compared with the microstructures solidified at conventional low thermal gradient conditions,the dendrite arm spacings,the interdendritic microporosity and γ/γ' eutectic,and the severity of solute segregation of the single-crystal superalloy solidified at ultra-high thermal gradient conditions were considerably reduced.It was shown that the microstructure solidified under ultra-high thermal gradient condition is ideal for the full exploitation of the excellent property potentials of single-crystal superalloys.
关键词:
single-crystal superalloy
,
null
,
null
朱鸥
,
李玉龙
,
张燕
,
曹玮
,
雷力明
材料导报
综述了国外航空发动机用单晶铸造高温合金热处理工艺.通过介绍国外第一代至第三代单晶合金成分与热处理制度的关系,阐述了最优的热处理条件应尽可能减少W、Re、Ta、Mo等元素的成分偏析.通过分析国外单晶热处理的特点,指出升温速率和冷却速率的控制对于单晶高温合金尤其是单晶铸件使用性能影响重大.最终为国内单晶高温合金热处理工艺的改进和发展提供借鉴.
关键词:
单晶高温合金
,
热处理工艺
,
成分偏析
