Effect of tensile dwell on high-temperature low-cycle fatigue and fracture behaviour of cast superalloy MAR-M247

被引：36
|
作者：
Sulak, Ivo [1 ]
Obrtlik, Karel [1 ]
机构：
[1] Acad Sci Czech Republ, Inst Phys Mat, Zizkova 22, Brno 61662, Czech Republic
来源：
ENGINEERING FRACTURE MECHANICS | 2017年 / 185卷
关键词：
Nickel-based superalloy; High-temperature low-cycle fatigue; Tensile dwell; Fatigue life; Damage mechanisms; DAMAGE MECHANISMS; CREEP-FATIGUE; DEGREES-C; ALLOY; 713LC; LIFE;
D O I：
10.1016/j.engfracmech.2017.04.002
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
Hot isostatically-pressed, nickel-based superalloy MAR-M247 was tested under fatigue and creep-fatigue conditions. Continuous cycling and cycling with 10 min tensile dwells in each cycle were applied in symmetrical strain control cycle with constant total strain amplitude at 900 degrees C in air. Cyclic hardening/softening curves, cyclic stress-strain curves and fatigue life curves were obtained. The introduction of tensile dwells resulted in lower fatigue life in total strain representation. Surface relief, specimen sections and fracture surface observations revealed crack initiation sites, crack density and crack paths, and help to clarify the effect of dwells on fatigue behaviour. (C) 2017 Elsevier Ltd. All rights reserved.
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页码：92 / 100
页数：9
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