718Plus镍基高温合金高温疲劳行为及断裂特征

IF 2.9 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Technology Pub Date : 2023-02-06 DOI:10.1080/10667857.2023.2174797

P. Zhao, Chongxiang Di, Tong Zhang, Minqing Wang

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Fatigue behavior and fracture characteristics of 718Plus nickel-based superalloy at high temperature

ABSTRACT The paper describes high cycle rotational bending fatigue (HCF) performance and fracture characteristics of 718Plus alloy at 600°C and 700°C, where the relationship between maximum cyclic stress (S) and fatigue cycles (N) at 600°C and 700°C is explored. We drew S-N curves, and established mathematical model, with simulating S-N curve function. The crack initiation of smooth specimens focus on the surface or subsurface, where the stress concentration caused by inclusions, carbides and microstructure defects, leading to tearing, and inclusion is the main form of crack initiation. In addition, the high cycle fatigue life of 718Plus alloy is greatly affected by the microstructure defects. According to the analysis of high cycle fatigue fracture morphology, at 700°C, the alloy fatigue crack growth is faster, and the number of secondary cracks is more than 600°C. Thus, the growth behaviour is greatly affected by temperature.

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来源期刊

Materials Technology 工程技术-材料科学：综合

CiteScore

6.00

自引率

9.70%

发文量

105

审稿时长

8.7 months

期刊介绍： Materials Technology: Advanced Performance Materials provides an international medium for the communication of progress in the field of functional materials (advanced materials in which composition, structure and surface are functionalised to confer specific, applications-oriented properties). The focus is on materials for biomedical, electronic, photonic and energy applications. Contributions should address the physical, chemical, or engineering sciences that underpin the design and application of these materials. The scientific and engineering aspects may include processing and structural characterisation from the micro- to nanoscale to achieve specific functionality.