【摘要】 研究了一种第三代镍基单晶高温合金经压痕加载后在不同条件下热处理后的再结晶行为。结果表明：在γ′相溶解温度(1270℃)以下合金不发生明显再结晶，γ′相溶解温度(1270℃)以上出现明显再结晶晶粒，γ′相的溶解是再结晶发生的必要条件；在1300℃分别固溶1、2和4 h及进行相同时效处理后，合金再结晶深度随固溶时间延长逐渐增加；铸态合金中γ+γ′共晶组织和粗大γ′相能够阻碍再结晶晶界迁移，铸态压痕试样的再结晶深度低于热处理态压痕试样。更多还原

【Abstract】 The recrystallization behavior of a third-generation nickel-based single crystal superalloy after indentation loading and subsequent heat treatment under different conditions was studied. The results show that the alloy does not undergo significant recrystallization below the dissolution temperature of the γ′ phase(1270 ℃), while significant recrystallization grains appear above the dissolution temperature of the γ′ phase(1270 ℃). The dissolution of the γ′ phase is a necessary condition for recrystallization to occur. After solution treatment at 1300 ℃ for 1 h, 2 h, and 4 h and that after the same aging treatment, the recrystallization depth of the alloy gradually increases with the increase of solution treatment time. The γ+γ′ eutectic structure and coarse γ′ phase in the as-cast alloy can hinder the migration of recrystallization grain boundaries, and the recrystallization depth of as-cast indentation sample is lower than that of heat-treated indentation sample.更多还原