温度对粉末冶金超合金 FGH95 低循环疲劳变形的影响

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2024-11-20 DOI:10.1016/j.ijfatigue.2024.108727

Yanjie Li , Yibin Liu , Kesi Wu , Jie Sun , Dahai Zhang , Qingguo Fei

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引用次数: 0

摘要

研究了FGH95合金在不同温度下低循环疲劳断裂的宏观形态和微观结构演变机制。研究发现，FGH95合金在420 °C、510 °C和600 °C温度下的断裂模式主要分为两类：低温（420 °C、510 °C）下的剪切断裂和高温（600 °C）下的I型断裂。断裂模式的变化可归因于析出相的强度随温度的升高而增加。在低温下，位错结构主要通过切割移动，而在高温下则通过爬升绕过析出相。位错的不同运动导致了 FGH95 合金在不同温度下的不同断裂类型。

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Temperature effects on low cycle fatigue deformation of powder metallurgy superalloy FGH95

The macroscopic morphology and microstructure evolution mechanism of the FGH95 alloy were investigated with regard to fracture under low-cycle fatigue at different temperatures. The fracture modes of the FGH95 alloy at 420 °C, 510 °C, and 600 °C were found to fall into two main categories: shear fracture at low temperatures (420 °C, 510 °C) and I type fracture at high temperatures (600 °C). The change in fracture mode can be attributed to the increase in strength of the precipitated phase with temperature. At low temperatures, the dislocation structure moves mainly by cutting, bypassing the precipitated phase by climbing at high temperatures. The different movement of the dislocations leads to the different fracture types of FGH95 alloy at different temperatures.

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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.