Journal of Pressure Vessel Technology

Volume: Page/CID:

Predicting Erosion-Corrosion Induced by the Interactions Between Multiphase Flow and Structure in Piping System
Erosion-corrosion failures frequently found in piping systems can lead to the leakage of pipes, or even damage of the whole system. Erosion-corrosion is a form of material degradation that involves el...

A New Computational Method for Probabilistic Elastic-Plastic Fracture Analysis
This paper presents a polynomial dimensional decomposition method for calculating the probability distributions of random crack-driving forces commonly encountered in elastic-plastic fracture analysis...

J. Pressure Vessel Technol. / Volume 131 / Issue 6 / Research Papers / Materials and Fabrication

Failure Analysis of a 9–12%Cr Steel Superheater Tube

J. Pressure Vessel Technol. -- December 2009 -- Volume 131, Issue 6, 061401 (9 pages)
doi:10.1115/1.3147982

You are not logged into the ASME Digital Library.
Log in

ABSTRACT

REFERENCES (16)

Author(s):
E. Pour saeidi
Department of Mechanical Engineering, Zanjan University, Zanjan 31585-381 Iran; IPPR Research Laboratory, Iran Power Plant Repair Co., Karaj, Iran

M. Aieneravaie and M. R. Mohammadi Arhani
IPPR Research Laboratory, Iran Power Plant Repair Co., Karaj, Iran

Thefailure analysis of 9–12% chromium steel tubes, containing about 2.5%molybdenum, is discussed in the present study. The component isused in a steam power plant boiler as a high-temperaturesuperheater tube and has been in service for about 100,000h. The failure occurred without appreciable wall thinning. Specimens weretaken from the region beneath the fracture surface and investigatedby optical and electron microscopes. The microstructure was composed offerrite and grain boundary particulate carbides. The results indicated thatthe fracture was initiated because of the bending of thetube near the anchor and propagation of the crack throughthe interfaces between massive carbides and matrix (sensitized zone). Finalfracture has occurred as a result of an overload dueto the decreasing of load carrying section produced by crackpropagation.