Crack initiation mechanisms during very high cycle fatigue of Ni-based single crystal superalloys at high temperature

被引：147
作者：
Cervellon, A. [1 ,4 ]
Hemery, S. [1 ]
Kuernsteiner, P. [2 ]
Gault, B. [2 ,3 ]
Kontis, P. [2 ]
Cormier, J. [1 ]
机构：
[1] Inst Pprime, Phys & Mech Mat Dept, UPR CNRS 3346, ISAE ENSMA, BP40109, F-86961 Futuroscope, France
[2] Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany
[3] Imperial Coll London, Royal Sch Mine, Dept Mat, Exhibit Rd, London SW7 2AZ, England
[4] Univ Calif Santa Barbara, Mat Dept, Santa Barbara, CA 93106 USA
来源：
ACTA MATERIALIA | 2020年 / 188卷
关键词：
Very high cycle fatigue; Crack initiation; High temperature; Nickel-based SX superalloy; Intermetallic particles; REGIME N-GREATER-THAN-10(7) CYCLES; HIGH-STRENGTH STEELS; LIFE REGIME; ULTRASONIC FATIGUE; DISLOCATION-MOTION; METALLIC MATERIALS; DAMAGE MECHANISMS; FRACTURE SURFACE; CREEP-BEHAVIOR; PROPAGATION;
D O I：
10.1016/j.actamat.2020.02.012
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Crack initiation mechanisms in the very high cycle fatigue (VHCF) regime of nickel-based single-crystal (SX) superalloys have been investigated at high temperature (1000 degrees C) and under fully reversed conditions (R = -1). For all Ni-based SX alloys tested, a discernible area called rough zone has been identified around the crack initiation site on the fracture surface and is for the first time described. By means of electron microscopy and atom probe analyses, localized and severe plastic activity occurring in the rough zone is evidenced. The high dislocation density provided by the slip bands induces single-phase recrystallized grains and phases precipitation (intermetallics or carbides) via the redistribution of interacting solutes in the rough zone. A crack initiation mechanism based on these observations and on the stress intensity parameter determined around the rough zone - which has been demonstrated to be a constant threshold dependent on the material - is finally proposed. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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页码：131 / 144
页数：14
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