Influence of operating time on the strength reliability of the gas generator turbine disk of the aircraft drive for the GPA

Velikanova, N. P.; Protasova, N. A.; Velikanov, P. G.; Kiselev, A. S.; Salih, Salih Indad Shareef

doi:10.1088/1742-6596/1891/1/012044

Cited by 1 publication

(1 citation statement)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Below 760 • C, this alloy exhibits excellent tensile strength and durability, while below 870 • C, it demonstrates outstanding oxidation resistance. Because of its strong crack propagation resistance and corrosion resistance, GH4738 alloy is widely used in turbine disk components of aero engines [7][8][9][10]. However, due to the high-volume percentage of the ′ phase (approximately 23.5%), achieving microstructure uniformity during the forging process becomes challenging.…”

Section: Introductionmentioning

confidence: 99%

Effect of Deformation Degree on Microstructure and Properties of Ni-Based Alloy Forgings

Dong,

Li,

Chen

et al. 2024

Metals

View full text Add to dashboard Cite

The primary objective of this paper is to investigate the influence of deformation degree on the microstructure and properties of a Ni-based superalloy. An upsetting experiment was conducted using a free-forging hammer to achieve a deformation degree ranging from 60% to 80%. The impact of the forging deformation degree on the hardness and high-temperature erosion performance was evaluated using the Rockwell hardness tester (HRC) and high-temperature erosion tester, respectively. The experimental results indicate that as the deformation degree increased, the hardness of the forged material progressively increased while the rate of high-temperature erosion gradually decreased. In order to comprehensively study the mechanism behind the variations in forging performance, optical microscopy (OM), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM) were employed. The findings reveal that as the deformation degree increased, the presence of small-angle grain boundaries and an increase in grain boundary area contributed to enhanced hardness in the alloy forgings. Furthermore, it was discovered that grain boundaries with twin orientation promoted dynamic recrystallization during deformation, specifically through a discontinuous dynamic recrystallization mechanism. Additionally, the precipitated γ′ phase in the alloy exhibited particle sizes ranging from 40 to 100 nm. This particle size range resulted in a higher critical shear stress value and a more pronounced strengthening effect on the alloy.

show abstract

Section: Introductionmentioning

confidence: 99%