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Residual stress driven creep cracking in type 316 stainless steel

Turski, M.; Sherry, A. H.; Bouchard, P. J. and Withers, P. J. (2004). Residual stress driven creep cracking in type 316 stainless steel. Journal of Neutron Research, 12(1-3) pp. 45–49.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1080/10238160410001734441
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Abstract

A specially designed compact tension (CT) specimen has been used to simulate reheat cracking observed in plant components operating above 500°C. The specimens were deformed in compression beyond yield and unloaded to produce high tensile residual stresses at the notch root. Test specimens were machined from an ex-service AISI Type 316H austenitic stainless steel steam header. After residual stressing, one specimen was crept for 4500 h at 550°C. Residual strains along the ligament of the specimens were measured using synchrotron and neutron diffraction techniques before and after creep. A 3D finite element (FE) model was developed and used to predict the residual stress and strain fields in the two conditions. A good correlation has been found between measurements and FE predictions before and after creep. Application of a creep ductility-exhaustion model to the specimen predicts the onset of simulated reheat crack initiation during the test. The validity of this model will be assessed on destructive examination of the specimen.

Item Type: Journal Article
ISSN: 1023-8166
Keywords: reheat cracking; creep damage; residual stress; creep cavitation
Academic Unit/Department: Mathematics, Computing and Technology > Engineering & Innovation
Item ID: 15066
Depositing User: P. John Bouchard
Date Deposited: 17 Mar 2009 14:11
Last Modified: 02 Dec 2010 20:23
URI: http://oro.open.ac.uk/id/eprint/15066
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