Publication: Failure evaluation on a high-strength alloy SA213-T91 super heater tube of a power generation
Date
2010
Authors
Ahmad J.
Purbolaksono J.
Beng L.C.
Ahmad A.
Journal Title
Journal ISSN
Volume Title
Publisher
SAGE Publications Ltd
Abstract
This article presents failure investigation on a high-strength alloy SA213-T91 super-heater tube. This failure is the first occurrence involving the material in Kapar Power Station Malaysia. The investigation includes visual inspections, hardness measurements, and microscopic examinations. The failed super-heater tube shows a wide open rupture with thin and blunt edges. Hardness readings on all the as-received tubes are used for estimating the operating metal temperature of the super-heater tubes. Microstructures of the failed tube show numerous creep cavities consisting of individual pores and chain of pores which form micro- and macro-cracks. The findings confirmed that the super-heater tube is failed by short-term overheating. Higher temperatures of the flue gas due to the inconsistent feeding of pulverized fuels into the burner is identified to cause overheating of the failed tube.
Description
Keywords
failure analysis , hardness measurements , high-strength alloy steel , micro-structure examinations , overheating , Alloy steel , Failure (mechanical) , Failure analysis , Hardness , High strength steel , Microstructure , Outages , Pulverized fuel , Tubes (components) , Failure investigation , Hardness measurement , Metal temperature , Micro and macro , overheating , Power station , Short-term overheating , Visual inspection , High strength alloys