Cycle-dependent creep-fatigue deformation and life predictions in a nickel-based superalloy at elevated temperature. (15th September 2021)

• Record Type: Journal Article
• Authors: Cheng, Lv-Yi; Wang, Run-Zi; Wang, Ji; Zhu, Shun-Peng; Zhao, Peng-Cheng; Miura, Hideo; Zhang, Xian-Cheng; Tu, Shan-Tung
• Is Part Of: International journal of mechanical sciences. Volume 206(2021)
• Publication Date: 2021-09-15
• Subjects: Creep-fatigue -- Non-unified model -- Life prediction -- Strain ratio -- Dwell time; Mechanical engineering -- Periodicals; Génie mécanique -- Périodiques; Mechanical engineering; Maschinenbau; Mechanik; Zeitschrift; Periodicals; 621.05
• DOI: 10.1016/j.ijmecsci.2021.106628
• Languages: English
• ISSNs: 0020-7403

Abstract

Abstract: A series of strain-controlled creep-fatigue tests with various dwell times and strain ratios are carried out on a nickel-based superalloy at 650 °C. Aiming at the mechanical understanding of creep-fatigue behavior, a non-unified constitutive framework is used to describe macroscopic cyclic deformation process to understand creep-fatigue behavior. Afterward, the quantitative evaluation of creep-fatigue damage is quantitatively determined by the cycle-by-cycle strain energy density exhaustion (SEDE) approach. The effects of strain ratio and dwell time on creep-fatigue life endurances can be well revealed by the proposed life model, where all the data points are predicted within ± 1.5 error band. Particularly, life prediction capacities with long dwell times are further improved based on three-regime creep mechanism.