The low cycle fatigue behaviour of MAR-M247 superalloy under different strain rates and cycle shapes at 750?C

被引：12
|
作者：
Sulak, I. [1 ]
Obrtlik, K. [1 ]
Babinsky, T. [1 ]
Guth, S. [2 ]
机构：
[1] Inst Phys Mat ASCR, Zizkova 22, Brno 61600, Czech Republic
[2] Karlsruhe Inst Technol, Inst Appl Mat, Engelbert Arnold Str 4, D-76128 Karlsruhe, Germany
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2022年 / 164卷
关键词：
Strain rate influence; Slow -fast & fast -slow tests; Creep -fatigue interaction; Nickel -based superalloy; High temperature; THERMOMECHANICAL FATIGUE; ELEVATED-TEMPERATURE; ISOTHERMAL FATIGUE; PHASE-SHIFT; DWELL TIME; CREEP; TENSILE; GROWTH; DEFORMATION; INTRUSIONS;
D O I：
10.1016/j.ijfatigue.2022.107133
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
High-temperature low-cycle fatigue experiments were performed at different strain rates on nickel-based su-peralloy MAR-M247. Furthermore, slow-fast, fast-slow and dwell-fatigue tests were conducted. The deformation, damage and lifetime behaviour as a function of strain rate and cycle shape were observed. Results show that the lifetime decreases with decreasing strain rate, indicating the negative influence of time-dependent creep and oxidation mechanisms. The lifetimes of slow-fast and dwell-fatigue tests are lower than those for fast-slow tests, although the mean stress is compressive in slow-fast and dwell-fatigue tests and tensile in fast-slow tests. Slow -fast and dwell-fatigue tests lead to grain boundary cavitation.
引用
收藏
页数：13
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