GH3230高温合金单轴拉伸性能和持久性能预测

Prediction of uniaxial tensile properties and stress rupture properties for GH3230 superalloy

摘要

GH3230 高温合金在航空发动机和核工业领域应用广泛，其构件的服役寿命评估高度依赖单轴拉伸性能与持久寿命预测的准确性。本工作重点研究该合金在不同温度下的单轴拉伸性能，以及在不同温度与应力组合条件下的持久寿命，并建立描述该合金拉伸行为的 Ramberg-Osgood（R-O）本构模型与 Chaboche 本构模型，以及用于预测持久寿命的等温线外推法和 Larson-Miller（L-M）参数模型。结果表明：在单轴拉伸性能预测方面，R-O 模型仅能较好预测合金在屈服点附近的应力，但整体应力-应变曲线的预测趋势存在较大偏差；而 Chaboche 模型则能更有效地描述 GH3230 高温合金不同温度下的单轴拉伸行为，在多数试验温度下的拟合相关系数接近 0.9。在持久寿命预测方面，等温线外推法和 L-M 法均表现出较高的预测精度，能够对该合金在不同服役条件下的持久寿命进行合理预测。

Abstract

GH3230 superalloy is widely used in the fields of aero-engine and nuclear industry. Due to its extensive application, the accurate assessment of service life of its components highly relies on the precise prediction of uniaxial tensile properties and stress rupture life. This paper focuses on investigating uniaxial tensile properties of this superalloy at different temperatures, as well as its stress rupture life under various combinations of temperature and stress. Correspondingly, the R-O constitutive model and the Chaboche constitutive model are established to describe the tensile behaviour of the alloy, while the isothermal line extrapolation method and the L-M parameter model are developed for predicting its stress rupture life. The results indicate that in terms of predicting uniaxial tensile properties, compared to the Chaboche constitutive model, the R-O model can only reasonably predict the stress near the yield point, showing a significant deviation in the overall prediction trend of the stress-strain curve. In contrast, the Chaboche constitutive model can more effectively describe the tensile behaviour of the GH3230 superalloy, with fitting correlation coefficients close to 0.9 at most test temperatures. Regarding the prediction of stress rupture life, both the isothermal line extrapolation method and the L-M method demonstrate high prediction accuracy. These models are capable of providing reasonable predictions for the stress rupture life of the superalloy under different service conditions.

关键词

GH3230 高温合金 / 单轴拉伸性能 / 持久寿命 / 性能预测 / 本构模型

Key words

GH3230 superalloy / uniaxial tensile property / stress rupture life / property prediction / constitutive model

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