Failure Analysis of Annealing Furnace Innerhood

The objective of this work is to find causes of failure of furnace hood and to provide remedial measures to extend the working life of furnace hood. By visual examination, it is found that concave and convex deformation occurs at the furnace hood, and finally fracture takes place. This results in thermal fatigue failure. Further, experimental examinations by metallographic, hardness and Impact strength measurement of the normal and failed sample have been conducted. It is found that the cause of failure is due to the presence of more amount of carbide. In addition, the carbide content is reduced by solution treatment. Using ANSYS software, stress and strain were analyzed for the furnace hood of existing design and modified design. The obtained result of modified design shows that by minimizing the stress and strain will Improve the life of furnace hood.