Importance of γ′shearing in low-cycle fatigue of a wrought superalloy

0584746 - ÚFM 2025 RIV US eng J - Journal Article
Babinský, Tomáš - Poczklán, Ladislav - Gálíková, Markéta - Polák, Jaroslav
Importance of γ′shearing in low-cycle fatigue of a wrought superalloy.
Fatigue and Fracture of Engineering Materials and Structures. Roč. 47, č. 6 (2024), s. 1927-1943. ISSN 8756-758X. E-ISSN 1460-2695
Institutional support: RVO:68081723
Keywords : high-temperature * hysteresis loop * room-temperature * behavior * mechanisms * damage * oxidation * fracture * steel * cyclic plasticity * gamma prime shearing * low-cycle fatigue * persistent slip band * Rene 41
Impact factor: 3.7, year: 2022
Method of publishing: Limited access
https://onlinelibrary.wiley.com/doi/10.1111/ffe.14272

The present study deals with the fatigue behavior of a wrought nickel-based superalloy Rene 41. Uniaxial, fully reversed low-cycle fatigue tests were conducted at room and elevated (800 degrees C) temperatures under total strain control. Cyclic response was analyzed using the statistical theory of the hysteresis loop, and scanning and transmission electron microscopies were employed to study relevant damage mechanisms. At room temperature, cyclic deformation was found to localize to slip bands since the first cycle, and most slip bands were formed very early in the fatigue life. Hence, shearing of the strengthening phase, coherent gamma ' precipitates, was found to be significant only in the first few cycles. At 800(degrees)C, fatigue life was affected by an environmental attack resulting in a surface oxide layer. Cyclic deformation was less localized, nevertheless, cyclic slip localization in persistent slip bands and resulting gamma ' shearing contributed to cyclic softening throughout the fatigue life.
Permanent Link: https://hdl.handle.net/11104/0352726