In Situ Study of the Mechanisms of High Temperature Damage in Elastic-Plastic Cyclic Loading of Nickel Superalloy

Abstract:

Article Preview

In-situ Low Cycle Fatigue test (LCF) at temperature 635 °C have been performed in SEM on flat specimen ofcast Inconel 713LC superalloy. The aim of the investigation was to studymechanisms of the fatigue damage during elastic-plastic cycling by theobservations of the characteristic surface relief evolution and theaccompanying internal dislocation structures. The selected locations on thesurface were systematically studied in-situ and documented by SEM and usingAFM. The surface relief in the first tensile half-cycle was formed by numerousslip steps on the primary slip planes (111). In the following compressionhalf-cycle additional opposite slip were formed. The relief was modified in thenext cycles but without forming additionally new slip traces in the primarysystem. The reorientation of two grains in the gauge area was measured usingEBSD. At the end of cyclic loading the relation between surface persistent slipmarkings and persistent slip bands in the interior of the material wasdocumented by TEM on lamella prepared by FIB. The early stages of extrusion andintrusion formation were documented. The damage mechanism evolution is closelyconnected with the cyclic strain localization to the persistent slip bands thatare also places of fatigue crack initiation.

Info:

Periodical:

Advanced Materials Research (Volumes 891-892)

Edited by:

Graham Clark and Chun H. Wang

Pages:

530-535

DOI:

10.4028/www.scientific.net/AMR.891-892.530

Citation:

M. Petrenec et al., "In Situ Study of the Mechanisms of High Temperature Damage in Elastic-Plastic Cyclic Loading of Nickel Superalloy", Advanced Materials Research, Vols. 891-892, pp. 530-535, 2014

Online since:

March 2014

Export:

Price:

$38.00

* - Corresponding Author

[1] R.C. Reed, The superalloys: fundamentals and applications, Cambridge University Press, Cambridge, (2006).

[2] A. Pineau, S.D. Antolovich, High temperature fatigue of nickel-base superalloys – A review with special emphasis on deformation modes and oxidation. Eng. Failure Analysis 16 (2009) 2668-2697.

DOI: 10.1016/j.engfailanal.2009.01.010

[3] M. Petrenec, K. Obrtlík, J. Polák, Inhomogeneous dislocation structure in fatigued INCONEL 713 LC superalloy at room and elevated temperatures Mater. Sci. Eng. A 400–401 (2005) 485-488.

DOI: 10.1016/j.msea.2005.01.058

[4] M. Petrenec, K. Obrtlík and J. Polák, High Temperature Low Cycle Fatigue of Superalloys Inconel 713LC and Inconel 792-5A. Key Eng. Mater. 348-349 (2007) 101-104.

DOI: 10.4028/www.scientific.net/kem.348-349.101

[5] K. Obrtlík, M. Petrenec, J. Man, J. Polák and K. Hrbáček, Isothermal fatigue behavior of cast superalloy Inconel 792-5A at 23 and 900 A degrees C, J. Mater. Sci. 44 (2009) 3305-33014.

DOI: 10.1007/s10853-009-3446-3

[6] J. Man, K. Obrtlík and J. Polák, Extrusions and intrusions in fatigued metals. Part 1. State of the art and history, Phil. Mag., 89 (2009) 1295-1336.

DOI: 10.1080/14786430902917616

[7] J. Polák, K. Obrtlík M. Petrenec J. Man T. Kruml, Mechanisms of high temperature damage in elastoplastic cyclic loading of nickel superalloys and TiAl intermetallics. Procedia Engineering 55 (2013) 114-122.

DOI: 10.1016/j.proeng.2013.03.229

In order to see related information, you need to Login.