Residual stress evaluation and fatigue life prediction in the welded joint by x-ray diffraction
2009
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.
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