3D imaging using X-Ray tomography and SEM combined FIB to study non isothermal creep damage of (111) oriented samples of γ / γ ′ nickel base single crystal superalloy MC2
Type
Conference PaperAuthors
Jouiad, MustaphaGhighi, J.
Cormier, Jonathan
Ostoja-Kuczynski, Elisabeth
Lubineau, Gilles

Méndez, José
KAUST Department
Advanced Membranes and Porous Materials Research CenterComposite and Heterogeneous Material Analysis and Simulation Laboratory (COHMAS)
Mechanical Engineering Program
Physical Science and Engineering (PSE) Division
Date
2012-01Permanent link to this record
http://hdl.handle.net/10754/564517
Metadata
Show full item recordAbstract
An unprecedented investigation consisting of the association of X-Ray tomography and Scanning Electron Microscopy combined with Focus Ion Beam (SEM-FIB) is conducted to perform a 3D reconstruction imaging. These techniques are applied to study the non-isothermal creep behavior of close (111) oriented samples of MC2 nickel base superalloys single crystal. The issue here is to develop a strategy to come out with the 3D rafting of γ' particles and its interaction whether with dislocation structures or/and with the preexisting voids. This characterization is uncommonly performed away from the conventional studied orientation [001] in order to feed the viscoplastic modeling leading to its improvement by taking into account the crystal anisotropy. The creep tests were performed at two different conditions: classical isothermal tests at 1050°C under 140 MPa and a non isothermal creep test consisting of one overheating at 1200°C and 30 seconds dwell time during the isothermal creep life. The X-Ray tomography shows a great deformation heterogeneity that is pronounced for the non-isothermal tested samples. This deformation localization seems to be linked to the preexisting voids. Nevertheless, for both tested samples, the voids coalescence is the precursor of the observed damage leading to failure. SEM-FIB investigation by means of slice and view technique gives 3D views of the rafted γ' particles and shows that γ corridors evolution seems to be the main creep rate controlling parameter. © 2012 Trans Tech Publications, Switzerland.Publisher
Trans Tech PublicationsJournal
Materials Science ForumConference/Event name
7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011ISBN
9783037853030ae974a485f413a2113503eed53cd6c53
10.4028/www.scientific.net/MSF.706-709.2400