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Proceedings Paper

Residual stress evaluation and fatigue life prediction in the welded joint by x-ray diffraction
Author(s): Keun Bong Yoo; Kwon Tae Hwang; Jung Chel Chang; Jae Hoon Kim
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Paper 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. The residual stress of the welded part in the recently constructed power plants has been the cause of a variety of accidents. The objective of this study is measurement of the residual stress and the full width at half maximum intensity (FWHM) by X-ray diffraction method and to estimate the feasibility of this application for fatigue life assessment of the high-temperature pipeline. The materials used for the study is P92 steel for the use of high temperature pipe on super critical condition. The test results were analyzed by the distributed characteristics of residual stresses and FWHM in x-ray diffraction intensity curve. Also, X-ray diffraction tests using specimens simulated low cycle fatigue damage were performed in order to analyze fatigue properties when fatigue damage conditions become various stages. As a result of X-ray diffraction tests for specimens simulated fatigue damages, we conformed that the ratio of the FWHM due to fatigue damage has linear relationship with fatigue life ratio algebraically. From this relationship, it was suggested that direct expectation of the life consumption rate was feasible.

Paper Details

Date Published: 20 October 2009
PDF: 7 pages
Proc. SPIE 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering, 749374 (20 October 2009); doi: 10.1117/12.843408
Show Author Affiliations
Keun Bong Yoo, Korea Electric Power Research Institute (Korea, Republic of)
Kwon Tae Hwang, Chungnam National Univ. (Korea, Republic of)
Jung Chel Chang, Korea Electric Power Research Institute (Korea, Republic of)
Jae Hoon Kim, Chungnam National Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 7493:
Second International Conference on Smart Materials and Nanotechnology in Engineering
Jinsong Leng; Anand K. Asundi; Wolfgang Ecke, Editor(s)

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