TY - JOUR

T1 - An EBSD Evaluation of the Microstructure of Crept Nimonic 101 for the Validation of a Polycrystal–Plasticity Model

AU - Reschka, S.

AU - Munk, L.

AU - Wriggers, P.

AU - Maier, H. J.

N1 - Funding information: Financial support of this study by the German Science Foundation (DFG) under contracts MA1175/63-1 and WR19/57-1 is gratefully acknowledged.

PY - 2017/11/2

Y1 - 2017/11/2

N2 - Nimonic 101 is one of the early nickel-based superalloys developed for the use in gas turbines. In such environments, the material is exposed to a combination of both high temperatures and mechanical loads for a long duration. Hence, thermal creep is of the utmost concern as it often limits service life. This study focuses on creep tests, carried out on Nimonic 101 at different temperatures under a constant tensile load of 735 MPa. To characterize the microstructural evolution, electron backscatter diffraction (EBSD) measurements were employed before and after loading. At higher temperatures, a significant change of the microstructure was observed. The grains elongated and aligned their orientation along the load axis. In parallel, a crystal plasticity material model has been set up in the classical large deformation framework. Modeling results are compared to the acquired EBSD data.

AB - Nimonic 101 is one of the early nickel-based superalloys developed for the use in gas turbines. In such environments, the material is exposed to a combination of both high temperatures and mechanical loads for a long duration. Hence, thermal creep is of the utmost concern as it often limits service life. This study focuses on creep tests, carried out on Nimonic 101 at different temperatures under a constant tensile load of 735 MPa. To characterize the microstructural evolution, electron backscatter diffraction (EBSD) measurements were employed before and after loading. At higher temperatures, a significant change of the microstructure was observed. The grains elongated and aligned their orientation along the load axis. In parallel, a crystal plasticity material model has been set up in the classical large deformation framework. Modeling results are compared to the acquired EBSD data.

KW - creep

KW - dislocation density

KW - EBSD

KW - large strain crystal plasticity

KW - Nimonic 101

KW - SEM

UR - http://www.scopus.com/inward/record.url?scp=85032940153&partnerID=8YFLogxK

U2 - 10.1007/s11665-017-3046-3

DO - 10.1007/s11665-017-3046-3

M3 - Review article

AN - SCOPUS:85032940153

VL - 26

SP - 6087

EP - 6098

JO - Journal of Materials Engineering and Performance

JF - Journal of Materials Engineering and Performance

SN - 1059-9495

IS - 12

ER -