Very high cycle fatigue of a notched Ni-based single crystal superalloy at high temperature

被引：6
作者：
Morales, A. Vicente [1 ,2 ]
Mauget, F. [1 ]
Larrouy, B. [2 ]
Villechaise, P. [1 ]
Cormier, J. [1 ]
机构：
[1] Inst Pprime, Phys & Mech Mat Dept, UPR CNRS 3346, ISAE ENSMA, 1 Ave Clement Ader,BP40109, F-86961 Futuroscope, France
[2] Safran Helicopter Engines Mat & Expertise Dept, Ave Joseph Szydlowski, F-64511 Bordes, France
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2024年 / 186卷
关键词：
Very High Cycle Fatigue at high temperature; Notch effect on fatigue lifetime; Fatigue crack initiation mechanisms; Ni-based SX superalloy; BEHAVIOR; MICROSTRUCTURE; OXIDATION;
D O I：
10.1016/j.ijfatigue.2024.108379
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
A new notched geometry has been developed for ultrasonic fatigue testing of CMSX-4 single crystal Ni-based superalloy specimens at 1000 degrees C. Ultrasonic fatigue tests were carried out at 1000 degrees C, R = -1 and 20 kHz using this new geometry. Two competing crack initiation mechanisms were identified for the studied range of fatigue lives: internal crack initiation from a casting pore associated to a rough zone (RZ) formation and surface crack initiation assisted by oxidation. Failure modes associated to the identified fatigue crack initiation mechanisms are discussed. Comparing fresh fractographic evidence with available results from the literature, it is shown that fatigue crack nucleation and first stages of crack propagation seem to govern VHCF fatigue life.
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页数：9
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