Abstract
Incompatible permanent strains in any engineering component are caused by the formation of residual stresses due to mechanical loading or thermal effect. They get generated or modified at every stage of the service life of the component. The stresses tend to increase due to the type of damage occurring in any engineering component such as fatigue, corrosion, erosion, or a synergistic effect under the influence of environmental conditions. The present investigation highlights about the residual stresses in a typical boiler tube component and the same is characterized by nondestructive methods viz., Magnetic Barkhausen Noise and X-ray Diffraction techniques to identify the type of damage such as corrosion and erosion have been discussed. The correlation of the stress data with respect to the hardness and microstructure of the in-service boiler tubes in comparison with an unused tube has been attempted. The result reveals that there is a considerable variation in the magnitude of the stress level as well as the hardness value in the damaged region compared to the unaffected location. Furthermore, it is seen that the microstructural features support the data. The damage assessment methodology thus serves as a tool to quantify the type and extent of damage of in-service tubes and forms a part of the quality assurance practice.
Published Version
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