Effect of temperature on fatigue behavior and deformation mechanisms of nickel-based superalloy SU-263

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2024-11-19 DOI:10.1016/j.ijfatigue.2024.108721

K. Dinesh , Barun Bharadwaj Dash , R. Kannan , Neeta Paulose , G.V. Prasad Reddy , Hariharan Krishnaswamy , S. Sankaran

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引用次数: 0

Abstract

The LCF behavior of SU-263 was investigated at various temperatures (1073, 1123, and 1173 K) and strain amplitudes of ± 0.4 to 0.8% at a constant strain rate of 3 × 10^-3 s⁻¹. The alloy displayed initial hardening followed by extensive cyclic softening until failure. It is observed that the presence of dislocation networks absorbs mobile dislocation, and the shearing of γ′ precipitates were responsible for cyclic softening at 1073 and 1123 K, whereas dissolution of γ′ precipitate and dislocation annihilation were responsible for cyclic softening at 1173 K. At elevated temperatures, the LCF behavior is significantly influenced by time-dependent processes such as dynamic strain aging (DSA), and oxidation. The occurrence of DSA manifests in the form of serrated plastic flow in stress–strain hysteresis loops, reduced half-life plastic strain amplitude, and increased cyclic work hardening. The alloy exhibits linear behavior in the Coffin-Manson (C-M) plot at 1073 and 1173 K. However, the C-M plot shows bi-linear behavior at 1123 K with the corresponding shift in the deformation mechanism at ± 0.5% strain amplitude. This study focuses on understanding the effects of temperature on fatigue behavior and the associated deformation mechanisms by using characterization techniques, such as scanning and transmission electron microscopy.

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温度对镍基超合金 SU-263 疲劳行为和变形机制的影响

研究了 SU-263 在不同温度（1073、1123 和 1173 K）和 ± 0.4 至 0.8% 的应变幅度（恒定应变速率为 3 × 10-3 s-1）下的 LCF 行为。合金显示出初始硬化，随后出现广泛的循环软化，直至破坏。据观察，位错网络的存在吸收了移动位错，γ′析出物的剪切导致了 1073 和 1123 K 时的循环软化，而γ′析出物的溶解和位错湮灭则导致了 1173 K 时的循环软化。DSA 的发生表现为应力-应变滞后环中的锯齿状塑性流动、半衰期塑性应变振幅减小以及循环加工硬化增加。该合金在 1073 和 1173 K 时的 Coffin-Manson（C-M）图中表现出线性行为，但在 1123 K 时，C-M 图显示出双线行为，在 ± 0.5% 应变振幅时，变形机制发生了相应的转变。本研究的重点是利用扫描和透射电子显微镜等表征技术了解温度对疲劳行为的影响以及相关的变形机制。

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来源期刊

International Journal of Fatigue 工程技术-材料科学：综合

CiteScore

10.70

自引率

21.70%

发文量

619

审稿时长

58 days

期刊介绍： Typical subjects discussed in International Journal of Fatigue address: Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements) Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions) Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation) Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering Smart materials and structures that can sense and mitigate fatigue degradation Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.