Effect of Residual Stress on High Temperature Deformation in a Weld Stainless Steel

Abstract:

Article Preview

This paper considers the measurement of residual stresses induced by mechanical loading in a weld Type 347 stainless steel. The work is based in part on an ongoing Round Robin collaborative effort by the Versailles Agreement on Materials and Standards, Technical Working Area 31, (VAMAS TWA 31) working on ‘Crack Growth of Components Containing Residual Stresses’. The specific objective of the work at Imperial College London and HMI, Berlin is to examine how residual stresses and prior straining and subsequent relaxation at high temperature contribute to creep crack initiation and growth for steels relevant to power plant applications. Tensile residual stresses have been introduced in the weld by pre-compression and neutron diffraction measurements have been carried out before and after stress relaxation at 650 oC. Significant relaxation of the residual stresses has been observed, in agreement with earlier work on a stainless steel. Preliminary results suggest that the strains local to the crack drop by over 60% after 1000 h relaxation at 650 oC for the weld steel. The results have been compared with finite element studies of elastic-plastic pre-compression and stress relaxation due to creep.

Info:

Periodical:

Materials Science Forum (Volumes 524-525)

Edited by:

W. Reimers and S. Quander

Pages:

311-316

DOI:

10.4028/www.scientific.net/MSF.524-525.311

Citation:

R. C. Wimpory et al., "Effect of Residual Stress on High Temperature Deformation in a Weld Stainless Steel ", Materials Science Forum, Vols. 524-525, pp. 311-316, 2006

Online since:

September 2006

Export:

Price:

$35.00

[1] A.H. Sherry, M. Turski, M.A. Wilkes, D.W. Beardsmore, P.J. Withers and P.J. Bouchard, The Development of a Compact Specimen to Study the influence of Residual Stresses on Fracture, FESI 6th Int. Conf. on Engineering Structural Integrity Assessment, Oct 2002, UMIST Manchester.

[2] M. R. Daymond, C. N. Tomé and M. A. M. Bourke, Measured and predicted intergranular strains in textured austenitic steel, Acta Materialia, Vol 48, Issue 2, 24 January 2000, P. 553-564.

DOI: 10.1016/s1359-6454(99)00354-7

[3] N. P. O'Dowd, K. M. Nikbin and F. R. Biglari, Creep crack initiation in a weld steel: effects of residual stress, proceedings of ASME Pressure Vessels and Piping Division Conference, July 1721, 2005, Denver, Colorado, USA.

DOI: 10.1115/pvp2005-71566

[4] M. Turski, A.H. Sherry, P.J. Bouchard and P.J. Withers, Residual Stress Driven Creep Cracking in Type 316 Stainless Steel, Journal of Neutron Research, January-September 2004 Vol. 12 (1-3), pp.45-49.

DOI: 10.1080/10238160410001734441

[5] M. Turski, PhD thesis, Manchester University.

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