GH132合金盘材缺口对疲劳及蠕变/疲劳交互作用下的力学性能的影响

Notch Effect on Fatigue and Creep/Fatigue Interaction Properties of GH132 Disk Superalloy

摘要: GH₁₃₂合金虽不具有持久缺口敏感性,但仍存在着低周疲劳的缺口敏感。蠕变/疲劳交互作用的断裂寿命曲线,无论是光滑还是缺口都具有一个最大值的"鼻子曲线"。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"区域,缺口试样寿命高于光滑试样寿命。本文提出涡轮盘材料的发展应在提高强度的同时,不断改善塑性,以达到"强韧化"的效果。

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.