Fatigue behavior of laser powder bed fusion GH4169 superalloy using different heat treatment methods

IF 7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2026-05-01 Epub Date: 2026-01-03 DOI:10.1016/j.ijfatigue.2025.109479

Tao Shi , Yadong Zhou , Ruiyang Li , Feng Zhang , Jingyu Sun , Guian Qian

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Abstract

GH4169 superalloy was manufactured by laser powder bed fusion process, and the effects of two types of heat treatment strategies (solution + aging (SA), and hot isostatic pressing + solution + aging (HSA)) on superalloy microstructure evolution and fatigue performance were studied. A detailed microstructural characterization of the initial material and fatigue failure specimen was carried out, and it was found that HSA treatment eliminated the cellular and lamellar substructures of the material, increased the grain size, reduced dislocation density and the size of precipitates, thereby reducing the fatigue resistance compared to SA-treated material. In addition, different types of strengthening mechanisms were superimposed to estimate the yield strength of these two types of heat-treated materials. Finally, a crystal plasticity finite element model combined with thermodynamic entropy generation was established to predict fatigue life.

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激光粉末床熔合GH4169高温合金不同热处理方式的疲劳行为

采用激光粉末床熔合法制备了GH4169高温合金，研究了固溶+时效（SA）和热等静压+固溶+时效（HSA）两种热处理策略对高温合金组织演变和疲劳性能的影响。对初始材料和疲劳破坏试样进行了详细的微观组织表征，发现与sa处理的材料相比，HSA处理消除了材料的细胞和片层亚结构，增加了晶粒尺寸，降低了位错密度和析出相的尺寸，从而降低了疲劳抗力。此外，通过叠加不同类型的强化机制来估计这两种热处理材料的屈服强度。最后，建立了结合热力学熵生成的晶体塑性有限元模型来预测疲劳寿命。

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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.