Browse > Article

The Characteristics of Residual Stresses in the Welded Joint of P92 Steel for Fossil Power Plant by the X-ray Diffraction  

Hyun, Jung-Seob (한국전력공사 전력연구원 수화력발전연구소)
Yoo, Keun-Bong (한국전력공사 전력연구원 수화력발전연구소)
Choi, Hyun-Sun (한국전력공사 전력연구원 수화력발전연구소)
Publication Information
Journal of the Korean Society for Precision Engineering / v.25, no.7, 2008 , pp. 116-123 More about this Journal
Abstract
In the fossil power plant, the reliability of the components which consist of the many welded parts depends on the quality of welding. The residual stress is occurred by the heat flux of high temperature during weld process. This decreases the mechanical properties as the strength of fatigue and fracture or causes the stress corrosion cracking and fatigue fracture. Especially, the accidents due to the residual stress occurred at the weld parts of high-temperature and high-pressure pipes and steam headers. Also, the residual stress of the welded part in the recently constructed power plants has been brought into relief as the cause of various accidents. The aim of this study is the measurement of the residual stress using the x-ray diffraction method. The merits of this are more accurate and applicable than other methods. The materials used for the study is P92 steel for the use of high temperature pipe on super critical condition. The variables of tests are the post-weld heat treatment, the surface roughness and the depth from the original surface. The test results were analyzed by the distributed characteristics of the full width at half maximum intensity (FWHM) in x-ray diffraction intensity curve and by the relation of hardness with FWHM.
Keywords
Residual Stress; P92 Steel; X-ray Diffraction; FWHM;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Noyan, I. C. and Cohen, J. B., 'Residual Stress Measurement by Diffraction and Interpretation,' Materials Research and Engineering, Springer-Verlag New York Inc., pp. 117-154, 1987
2 Moore, M. G. and Evans, W. P., 'Mathematical Correction for Stress in Remover Layers in X-ray Diffraction Residual Stress Analysis,' Trans. of Society of Automotive Engineers, Vol. 66, pp. 355-360, 1958
3 Han, B. H. and Park, W. K., 'A Study of X-ray Residual Stress Measurements on Textured Steel,' Journal of the Korean Institute of Metal and Material, Vol. 22, No. 9, pp. 768-773, 1984
4 Kandil, F. A., Lord, J. D., Fry, A. T. and Grant, P. V., 'A Review of Residual Stress Measurement Methods,' National Physical Laboratory, MATC(A)04, pp. 1-3, 2002
5 Stresstech GmbH, Bahnhofstrasse 3 D-56457 WESTERBURG, Germany, www.stresstech.de
6 Struers Ltd, Unit 25a B90 4NZ Solihull West Midlands, United Kingdom, www.struers.com
7 Cho, S. S., Kim, S. H. and Joo, W. S., 'A Study on the Prediction of Fatigue Life in 2024-T3 Aluminium using X-ray Half Value Breadth,' Journal of the Korean Society for Precision Engineering, Vol. 17, No. 1, pp. 145-152, 2000
8 Deng, D., Luo, Y., Serizawa, H., Shibahara, M. and Murakawa, H., 'Numerical Simulation of Residual Stress and Deformation Considering Phase Transformation Effect,' Trans. of Joining and Welding Research Institute, Vol. 32, No. 2, pp. 325-333, 2003
9 Sikarskie, D. L., 'On a Series Form of Correction to Stresses Measured Using X-ray Diffraction,' Trans. of AIME, Vol. 239, pp. 577-580, 1967