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.
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