Life assessment of anisotropic low cycle fatigue of nickel-base single crystal superalloy

被引：23
|
作者：
Luo, Cheng [1 ]
Yuan, Huang [1 ]
机构：
[1] Tsinghua Univ, Sch Aerosp Engn, Beijing, Peoples R China
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2023年 / 167卷
关键词：
Single crystal superalloy; Low cycle fatigue; Critical slip plane; Life prediction; RESOLVED SHEAR-STRESS; HIGH-TEMPERATURE FATIGUE; CRITICAL PLANE; YIELD-STRESS; BEHAVIOR; ORIENTATION; DEPENDENCE; MODEL; SLIP; ASYMMETRY;
D O I：
10.1016/j.ijfatigue.2022.107310
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Anisotropic low cycle fatigue (LCF) behavior of nickel-base single crystal superalloy was studied in three distinct crystal orientations. Fractography analysis revealed that activated slip systems under tension were octahedral for the [001]/[011] specimens and cubic slip systems for the [111] specimens, respectively. Based on the critical slip plane concept, the resolved shear stress/strain and the normal stress/strain on slip planes were calculated, forming a damage factor for multiaxial fatigue. The virtual resolved strain energy model was proposed to describe the anisotropic fatigue behavior and extensively evaluated on different crystal orientations, strain ratios and temperatures. The predicted fatigue lives matched well with the experimental results.
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页数：15
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