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AI-Based Degradation Index from the Microstructure Image and Life Prediction Models Based on Bayesian Inference

Author

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  • Junsang Yu

    (Data Analytics Team, Doosan Enerbility, Changwon 51711, Republic of Korea
    Department of Applied Data Science, Sungkyunkwan University, Seoul 03063, Republic of Korea)

  • Hayoung Oh

    (College of Computing and Informatics, Sungkyunkwan University, Seoul 03063, Republic of Korea)

Abstract

In this study, we propose a consistent and explainable degradation indexing method and a non-destructive-based degradation and creep-life prediction method from extensive destructive test (creep-rupture) data of a nickel-based superalloy (DA-5161 SX), an extreme-environment material. High-temperature components made of nickel-based superalloys that operate in extreme environments (e.g., gas turbine blades) deteriorate over time and shorten the life of the device. To ensure the safety and efficiency of the equipment, it is important to predict the lifetime of high-temperature parts, and a consistent and explanatory degradation index and a reliable predictive model that can predict the degree of degradation and life without destructive testing of high-temperature parts are needed. As the degradation of nickel-based superalloys progresses, degradation indices reflecting the geometrical characteristics are required that focus on the fact that the shape of the gamma-prime phase becomes longer and larger. A representative value of the degradation index was selected through parameter inference based on a Bayesian method, and the high-dimensional degradation index of previous studies was simplified to only one dimension. The robustness of the degradation index quantification model was verified by confirming that the degradation index obtained from 20% of the test images had the lowest change rate of the degradation index obtained from 80% of the training images at 6.9%. The basis for predicting the life of high-temperature parts without destructive testing was established in the degradation index and life prediction model by connecting environmental conditions and degradation indices/the LMP (Larson–Miller parameter) to represent creep life in regression models. Gaussian process regression (GPR) models based on sampling-based Bayesian inference performed well in terms of both RMSE in the degradation index and the LMP prediction model, demonstrating robust behavior in performance variation. This may be used as a key health factor that indicates the soundness of diagnostic solutions in the future, and it is expected to be a foundational technology for decision-making models for maintenance, repair, and disposal.

Suggested Citation

  • Junsang Yu & Hayoung Oh, 2023. "AI-Based Degradation Index from the Microstructure Image and Life Prediction Models Based on Bayesian Inference," Sustainability, MDPI, vol. 15(9), pages 1-40, April.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:9:p:7298-:d:1134611
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    References listed on IDEAS

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