摘要
γ′和Y2O3强化的镍基超合金高于1000℃仍有优异的蠕变性能,可用作涡轮喷气发动机中的叶片。本文介绍了氧化物弥散强化(ODS)镍基超合金的制备和三阶段热处理获得柱状晶粒,重点分析了其独特的二次再结晶行为,同时阐述了预退火、区域退火速率以及γ′和Y2O3的含量对二次再结晶的影响。讨论了γ′溶解诱发二次再结晶、弥散相粗化诱发二次再结晶和晶界形核三种理论,解释了二次再结晶温度高和活化能高的原因。最后讨论了细晶粒态和粗晶粒态在不同应变速率和不同取向上性能的差异。
Oxide Dispersion Strengthening（ODS） nickel-base superalloy strengthened by γ′ and oxide dispersion exhibits excellent creep resistance above 1000℃,which can be used as turbine blade material in advance jet engine.The fabrication process and three-step heat treatment to obtain coarse elongated grain were introduced.The main focus was on the special recrystallization behaviour and the effects of preannealing were analyzed,the moving speed of hot zone and the content of γ′ and Y2O3 on secondary rescystallization were analyzed.Three kinds of theories including secondary rescystallization induced by the dissolution of γ′ or the coarsening of dispersion and the grain boundary nucleation theory were discussed.The high rescystallization temperature and high activation energy was explained.Finally,the mechanical properties of the material with fine grain and coarse elongated grain,as well as the effects of orientation and strain rate were analyzed.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2010年第6期90-96,共7页
Journal of Materials Engineering
关键词
氧化物弥散强化
镍基超合金
蠕变性能
机械合金化
oxide dispersion strengthen
nickel based superalloy
creep resistance
mechanical alloying
