Notch Effect on Fatigue and Creep/Fatigue Interaction Properties of GH132 Disk Superalloy
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摘要: GH132合金雖不具有持久缺口敏感性,但仍存在著低周疲勞的缺口敏感。蠕變/疲勞交互作用的斷裂壽命曲線,無論是光滑還是缺口都具有一個最大值的"鼻子曲線"。在"鼻子"的上部合金存在缺口敏感性,而在"鼻子"的下部和"鼻子"區域,缺口試樣壽命高于光滑試樣壽命。本文提出渦輪盤材料的發展應在提高強度的同時,不斷改善塑性,以達到"強韌化"的效果。
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關鍵詞:
- 鐵基高溫合金GH132 /
- 缺口敏感性 /
- 蠕變疲勞交互作用 /
- 強韌化
Abstract: Iron-base disk superalloy GH132 is susceptible to LCF notchsensitivity,even it has no stress rupture notch sensitivity at elevated temperature. The creep/fatigue interaction lives to fracture of GH132 for notch and smooth specimens both exist "nose" curves with maximum lives to fracture. In the regime above the "nose" alloy is susceptible to notch sensitivity. Below and near the "nose" regime, lives to fracture of notch specimens are longer than smooth specimens. For turbine disk alloy development is nesessary to raise the strength and to improve the ductility both. -
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