Rejuvenation heat treatments can restore the microstructures and mechanical properties of the degraded turbine blades in gas turbine engines. Herein we analyze the effects of rejuvenation heat treatments on the microstructural characteristics and mechanical properties of damaged and undamaged specimens of a Ni-based superalloy, K403. The damaged specimens were found to have degraded microstructures and shorter creep lifetime than the undamaged specimen. The rejuvenation heat treatment proved beneficial, especially for specimens exposed to damage for 50 h. In addition, the microstructure recovery and creep life were found to depend on the pre-damage durations of the specimens. A γ′-precipitate-based creep lifetime model was established to predict the residual lifetime based on the microstructural information.

中文翻译：

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再生热处理后受损K403合金的显微组织演变和蠕变性能恢复

再生热处理可以恢复燃气涡轮发动机中退化涡轮叶片的微观结构和机械性能。在此，我们分析了再生热处理对镍基高温合金 K403 损坏和未损坏试样的显微组织特征和机械性能的影响。发现损坏的试样比未损坏的试样具有退化的微观结构和更短的蠕变寿命。回春热处理证明是有益的，特别是对于暴露于损伤 50 小时的试样。此外，发现微观结构恢复和蠕变寿命取决于试样的预损伤持续时间。建立了基于γ'-沉淀物的蠕变寿命模型，根据微观结构信息预测残余寿命。