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Review of Residual Stresses and Failures in Boiler Tubes
Siddharth Shete#1, Nitesh Kumar #2, Praphulla Nalawade#3, Prakash Tripathi#4

Published in: Journal for Advance Research in Applied Sciences
Volume- 4, Issue-7, pp.51-59, Dec 2017
DPI :-> 16.10089.JARAS.2017.V4I7.5159.2220



Abstract
There are many problems associated with the boiler tubes such as formation of cracks, deposition of oxide layers on the inner side of boiler tube and formation of stresses such as residual stress, transient thermal stress. These problems should be investigated in order to maintain the boiler performance in an efficient way. The fracture analysis of weld overlay coating on the fireside of boiler tube is done in order to investigate the cracks in the tube by using the parameter stress intensity factor. During the welding process residual stresses are developed in the material which leads to distortion of structure that result in the failure of the boiler tube so the experimental study is done in which AACHD technique is used to measure the residual stresses and Global PWHT is used to reduce these residual stresses. In the case study of failed boiler tubes result shows that, due to the formation of oxide layers overheating of tube increases which leads to decrease in hardness of boiler tube and then failure occurs.

Key-Words / Index Term
Residual Stress, Boiler Tube, Overlay Coating, Thermal Gradient, PWHT

How to cite this article
Siddharth Shete#1, Nitesh Kumar #2, Praphulla Nalawade#3, Prakash Tripathi#4 , “Review of Residual Stresses and Failures in Boiler Tubes”, Journal for Advance Research in Applied Sciences, 4, Issue-7, pp.51-59, Dec 2017. DPI:16.10089.JARAS.V4.I7.2220