Study on Microstructure and Fatigue Properties of FGH96 Nickel-Based Superalloy

In this study, using synchrotron radiation X-ray imaging, the microstructure, tensile properties, and fatigue properties of FGH96 nickel-based superalloy were tested, and the fatigue damage mechanism was analyzed. An analysis of the experimental results shows that the alloy structure is dense withou...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Yishan Bai, Shanglei Yang, Minqi Zhu, Cong Fan
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	synchrotron radiation X-ray imaging fatigue performance fatigue crack FGH96 alloy microstructure Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/9b4e695b059a4bdda924016ad84e0f97
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:9b4e695b059a4bdda924016ad84e0f97
record_format	dspace
spelling	oai:doaj.org-article:9b4e695b059a4bdda924016ad84e0f972021-11-11T17:52:08ZStudy on Microstructure and Fatigue Properties of FGH96 Nickel-Based Superalloy10.3390/ma142162981996-1944https://doaj.org/article/9b4e695b059a4bdda924016ad84e0f972021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6298https://doaj.org/toc/1996-1944In this study, using synchrotron radiation X-ray imaging, the microstructure, tensile properties, and fatigue properties of FGH96 nickel-based superalloy were tested, and the fatigue damage mechanism was analyzed. An analysis of the experimental results shows that the alloy structure is dense without voids or other defects. It was observed that the primary γ′ phase is distributed on the grain boundary in a chain shape, and the secondary γ′ phase is found inside the crystal grains. The X-ray diffraction (XRD) pattern indicates that no other phases were seen except for the γ and γ′ phases. The tensile strength of the alloy is 1570 MPa and the elongation is 12.1%. Using data fitting and calculation, it was found that the fatigue strength of the alloy under the condition of 5 × 10<sup>6</sup> cycles is 620.33 MPa. A fatigue fracture has the characteristics of secondary crack, cleavage step, fatigue stripe, tire indentation, and dimple. The fracture is a mix of cleavage fracture and ductile fracture. Through a three-dimensional reconstruction of the alloy synchrotron radiation imaging area, it was found that the internal defects are small and mostly distributed at the edge of the sample. The dimple morphology is formed by cavity aggregation and cavity germination resulting from defects in the material itself, fracture of the second-phase particles, and separation of the second-phase particles from the matrix interface. By analyzing the damage mechanism of fatigue fractures, it is concluded that the cleavage step is formed by the intersection of cleavage planes formed by branch cracks, with the main crack of the confluence extending forward to form a cleavage fracture. The crack propagation path was also analyzed, and under the action of cyclic load and tip passivation, the crack shows Z-shaped propagation.Yishan BaiShanglei YangMinqi ZhuCong FanMDPI AGarticlesynchrotron radiation X-ray imagingfatigue performancefatigue crackFGH96 alloymicrostructureTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6298, p 6298 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	synchrotron radiation X-ray imaging fatigue performance fatigue crack FGH96 alloy microstructure Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	synchrotron radiation X-ray imaging fatigue performance fatigue crack FGH96 alloy microstructure Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Yishan Bai Shanglei Yang Minqi Zhu Cong Fan Study on Microstructure and Fatigue Properties of FGH96 Nickel-Based Superalloy
description	In this study, using synchrotron radiation X-ray imaging, the microstructure, tensile properties, and fatigue properties of FGH96 nickel-based superalloy were tested, and the fatigue damage mechanism was analyzed. An analysis of the experimental results shows that the alloy structure is dense without voids or other defects. It was observed that the primary γ′ phase is distributed on the grain boundary in a chain shape, and the secondary γ′ phase is found inside the crystal grains. The X-ray diffraction (XRD) pattern indicates that no other phases were seen except for the γ and γ′ phases. The tensile strength of the alloy is 1570 MPa and the elongation is 12.1%. Using data fitting and calculation, it was found that the fatigue strength of the alloy under the condition of 5 × 10<sup>6</sup> cycles is 620.33 MPa. A fatigue fracture has the characteristics of secondary crack, cleavage step, fatigue stripe, tire indentation, and dimple. The fracture is a mix of cleavage fracture and ductile fracture. Through a three-dimensional reconstruction of the alloy synchrotron radiation imaging area, it was found that the internal defects are small and mostly distributed at the edge of the sample. The dimple morphology is formed by cavity aggregation and cavity germination resulting from defects in the material itself, fracture of the second-phase particles, and separation of the second-phase particles from the matrix interface. By analyzing the damage mechanism of fatigue fractures, it is concluded that the cleavage step is formed by the intersection of cleavage planes formed by branch cracks, with the main crack of the confluence extending forward to form a cleavage fracture. The crack propagation path was also analyzed, and under the action of cyclic load and tip passivation, the crack shows Z-shaped propagation.
format	article
author	Yishan Bai Shanglei Yang Minqi Zhu Cong Fan
author_facet	Yishan Bai Shanglei Yang Minqi Zhu Cong Fan
author_sort	Yishan Bai
title	Study on Microstructure and Fatigue Properties of FGH96 Nickel-Based Superalloy
title_short	Study on Microstructure and Fatigue Properties of FGH96 Nickel-Based Superalloy
title_full	Study on Microstructure and Fatigue Properties of FGH96 Nickel-Based Superalloy
title_fullStr	Study on Microstructure and Fatigue Properties of FGH96 Nickel-Based Superalloy
title_full_unstemmed	Study on Microstructure and Fatigue Properties of FGH96 Nickel-Based Superalloy
title_sort	study on microstructure and fatigue properties of fgh96 nickel-based superalloy
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/9b4e695b059a4bdda924016ad84e0f97
work_keys_str_mv	AT yishanbai studyonmicrostructureandfatiguepropertiesoffgh96nickelbasedsuperalloy AT shangleiyang studyonmicrostructureandfatiguepropertiesoffgh96nickelbasedsuperalloy AT minqizhu studyonmicrostructureandfatiguepropertiesoffgh96nickelbasedsuperalloy AT congfan studyonmicrostructureandfatiguepropertiesoffgh96nickelbasedsuperalloy
_version_	1718432015004467200

Study on Microstructure and Fatigue Properties of FGH96 Nickel-Based Superalloy

Ejemplares similares