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Residual stresses in a quenched superalloy turbine disc: measurements and modeling

Rist, M.A.; Tin, S.; Roder, B.A.; James, J.A. and Daymond, M.R. (2006). Residual stresses in a quenched superalloy turbine disc: measurements and modeling. Metallurgical and Materials Transactions A, 37(2) pp. 459–467.

URL: http://www.ingentaconnect.com/content/tmsasm/mmta/...
DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1007/s11661-006-0017-y
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Abstract

A series of neutron diffraction measurements have been carried out to determine the elastic residual strains deep within a large, 40-cm-diameter, forged and water-quenched IN718 aeroengine compressor disc. Neutron path lengths of up to 6 cm were necessary to probe the thickest parts of the forging, and three-dimensional strain and stress components have been derived for the first time in such a large superalloy specimen. Measurements have been compared with the results from a coupled thermal-mechanical finite-element model of the quenching process, based upon appropriate temperature-dependent material properties, with some success. The general residual stress state in the disc is one of near-surface compression, balanced by tension within the disc interior. The steepest stress and strain gradients occur in the transition region from compression to tension, about 1 cm below the surface all around the disc. The largest stress component is in the disc tangential direction and reaches a magnitude of 400 to 500 MPa near the disc surface and at its core. This exceeds the effective yield stress because of the presence of significant hydrostatic stress.

Item Type: Journal Article
ISSN: 1543-1940
Academic Unit/Department: Mathematics, Computing and Technology > Engineering & Innovation
Item ID: 6964
Depositing User: Martin Rist
Date Deposited: 22 Feb 2007
Last Modified: 02 Dec 2010 19:57
URI: http://oro.open.ac.uk/id/eprint/6964
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