粉末高温合金夹杂物引起疲劳裂纹萌生微观机理研究现状

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Abstract With the development of aero-engine, the service requirements of turbine disk, the core heat-resistant component, are increasing, and nic-kel-based powder superalloy has become thefirst choice material for turbine disk. At present, it is inevitable to introduce inclusion defects in the preparation of powder superalloy turbine disk, and the existence of inclusions will lead to the obvious reduction of the mechanical properties of the alloy, especially the low cycle fatigue performance. In order to establish the fatigue life model of powder superalloy with defects, it is necessary to study the cracking and initiation mechanism of inclusions in the alloy. After clarifying the classification and source of inclusions in powder superalloys, scholars at home and abroad have done a lot of research on the influence of composition, shape, position, size and self-characteristics of inclusions on fatigue properties, and made some progress, explaining the fatigue cracking mode mechanism of various inclusions on the scale of micromechanics. In recent years, some scholars have used advanced detection methods to explain the cracking mechanism of inclusions from themicromechanical angles of dislocation, residual stress and strain energy. Then, the research method and model of fatigue life prediction of powder superalloy are introduced. Combined with the existing problems, it is pointed out that the study of inclusion cracking mechanism is the key to establishing a reliable fatigue life prediction model of powder superalloy. The existing problems in the research of crack initiation caused by inclusions are considered, and it is pointed out that when studying the crack initiation mechanism, the multi-scale characterization and characteristics should be linked, and the mutual response relationship in the crack initiation process should be analyzed on the micro-meso-macro scale, thus laying a foundation for establishing the fatigue crack initiation life method of powder superalloy considering defects.

Key words： powder superalloy inclusion fatigue microscopic mechanism

Published: 09 December 2021

CLC number:

TB-31

Fund:This work was financially supported by Major Special basic Research on Aeroengine and Gas Turbine (2017-Ⅳ-0004-0041).

About author:: Jiabin Liu received his B.S. Degree in applied chemistry from Harbin Engineering University in June 2019. He is currently pursuing his Ph. M.E in Aero Engine Corporation of China(AECC), Beijing Institute of Aeronautical Materials under the supervision of researcher Xinling Liu. his research has focused on failure analysis and fracture damage mechanism of metal materials.
Xinling Liu recieved her Ph.D. degree in materials science from the Beijing Institute of Aeronautial Mate-rials. She acquired four provincal and ministerial awards. In addition, she has published about 50 journal papers and three professional books as the first author. Her Futigue fractography quantitive analysis was published by the Publishing Fund of National Defense Industry Press. She is a member of the Failure Analysis Branch of Chinese Mechanical Engineering Society and AVIC Failure Analyst Qualification Conmittee, and the editor of Failure analysis and prevention. She has been responsible for many scientific reasearch projects, including 973,863, Aero-engine and gas turbine project, the national defense technology foundation and so on. Her research interests focuses on the failure analysis and prevention, safety and life prediction, fractography quantitative analysic. failure analysis expert system, and fracture characteristics and damage mechanism of advanced superallyos.

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Cite this article:

LIU Jiabin,LIU Xinling,LI Zhen. Research Status of Micro-mechanism of Fatigue Crack Initiation Caused by Inclusions in Powder Superalloy[J]. Materials Reports, 2021, 35(z2): 385-390.

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http://www.mater-rep.com/EN/ OR http://www.mater-rep.com/EN/Y2021/V35/Iz2/385

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