Application of Electron Fractography to Fatigue Studies

2009 ◽  
pp. 89-89-35 ◽  
Author(s):  
JC McMillan ◽  
RW Hertzberg
Keyword(s):  
Electron Fractography

Failure Analysis of Steel Superheater Tube Fractured in a Boiler of a Power Plant

2011 ◽  
Vol 462-463 ◽  
pp. 467-471
Author(s):  
Zainul Huda
Keyword(s):  
Power Plant ◽  
Steam Temperature ◽  
Hardness Testing ◽  
Visual Examination ◽  
Creep Failure ◽  
Electron Fractography ◽  
Superheater Tube ◽  
Micro Cracks ◽  
Long Time

This paper presents a case study of ASME SA213 type-T22 alloy steel superheater tube that failed in a boiler of a power plant. The failed superheater tube was investigated by visual examination, metallography, optical microscopy, electron fractography, and hardness testing. Microscopic examinations revealed inclusion, pre-existing micro-cracks and cementite precipitates at the grain boundaries in the microstructure; which were thought to be one of the major causes of failure of the superheater tube. Another major cause failure of boiler type T-22 was found to be creep failure because the boiler had been under use for a long time (36573 hours) at high steam temperature of around 420 °C with 130 bar pressure. Finally, recommendations have been suggested to improve the material characteristics and properties of the superheater tube for application in boiler of the power plant.

Using electron fractography for examining reasons for failure of centrifugally cast pipes of MK-40 steel

1990 ◽  
Vol 26 (1) ◽  
pp. 103-105
Author(s):  
L. E. Vatnik ◽  
G. K. Marakhova ◽  
Ya. A. Polonskii
Keyword(s):  
Electron Fractography ◽  
Centrifugally Cast

Quantitative electron fractography of the brittle failure of iron in 15G2AFDps steel

1976 ◽  
Vol 8 (6) ◽  
pp. 744-746
Author(s):  
A. Ya. Krasovskii ◽  
V. A. Stepanenko
Keyword(s):  
Brittle Failure ◽  
Electron Fractography

scholarly journals Investigation Into the Cause of Failure of a Turboprop Impeller in Service

1985 ◽  
Author(s):  
H. Y. Wong
Keyword(s):  
Electron Microscopy ◽  
Fatigue Fracture ◽  
Low Pressure ◽  
Energy Dispersive ◽  
Energy Dispersive Analysis ◽  
Electron Fractography ◽  
X Ray ◽  
Dispersive Analysis ◽  
Transmission Electron ◽  
Cause Of Failure

A 2-stage centrifugal flow turboprop Dart engine failed recently in service due to the failure of the low pressure impeller. Examination by various techniques including electron microscopy based on scanning, energy dispersive analysis of x-ray and transmission electron fractography indicates that the cause was metallurgical in nature, resulting from a material manufacturing defect followed by fatigue fracture and finally by tensile rupture of the material.

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