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07448 Role of Stress Conditions on Stress Assisted Corrosion Behavior of Carbon Steel Boiler Tubes

Picture for 07448 Role of Stress Conditions on Stress Assisted Corrosion Behavior of Carbon Steel Boiler Tubes
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Product Number: 51300-07448-SG
ISBN: 07448 2007 CP
Author: Dong Yang, Preet M. Singh, and Richard W. Neu
Publication Date: 2007
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$20.00
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Stress assisted corrosion (SAC) is one of the major reasons for carbon steel tube failure in industrial and power boilers. The initiation and growth of SAC strongly depends upon the formation and stability of the protective magnetite film, Fe3O4, on the waterside surface of boiler tubes. A recirculation autoclave facility was set up, in which slow strain rate tests (SSRT) and low frequency cyclic tests were carried out in simulated boiler water environment on smooth carbon steel specimens to investigate the role of environment and cyclic stresses on crack initiation and propagation. Preliminary results have shown that SAC crack susceptibility increased with the increase of mean stress, and amplitude respectively, but decreased as the frequency of cyclic loading goes up. Stress amplitude shows stronger influence on the crack growth and less effect on the crack initiation than the mean stress value. The results from SSRT and low-frequency tests indicate that the strain rate also affects SAC initiation and growth in boiler water environments. Results from this study indicate that the SAC crack initiation and propagation mechanisms involve magnetite film breaking and repassivation.
Stress assisted corrosion (SAC) is one of the major reasons for carbon steel tube failure in industrial and power boilers. The initiation and growth of SAC strongly depends upon the formation and stability of the protective magnetite film, Fe3O4, on the waterside surface of boiler tubes. A recirculation autoclave facility was set up, in which slow strain rate tests (SSRT) and low frequency cyclic tests were carried out in simulated boiler water environment on smooth carbon steel specimens to investigate the role of environment and cyclic stresses on crack initiation and propagation. Preliminary results have shown that SAC crack susceptibility increased with the increase of mean stress, and amplitude respectively, but decreased as the frequency of cyclic loading goes up. Stress amplitude shows stronger influence on the crack growth and less effect on the crack initiation than the mean stress value. The results from SSRT and low-frequency tests indicate that the strain rate also affects SAC initiation and growth in boiler water environments. Results from this study indicate that the SAC crack initiation and propagation mechanisms involve magnetite film breaking and repassivation.
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Picture for 07443 Stress Assisted Corrosion in Boiler Tubes - Failure Analysis
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07443 Stress Assisted Corrosion in Boiler Tubes - Failure Analysis

Product Number: 51300-07443-SG
ISBN: 07443 2007 CP
Author: Preet M. Singh, Steven J. Pawel, Dong Yang, and Jamshad Mahmood
Publication Date: 2007
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Stress assisted corrosion (SAC) is a major concern for kraft recovery boilers in the pulp and paper industry. A water leak can cause a smelt-water explosion in the boiler. A number of carbon steel tubes showed a deep decarburized layer on the inner surface (water-touched) and also an unusually large grain size at the inner tube surface.
Picture for 07444 STRESS RELATED BOILER FAILURES
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07444 STRESS RELATED BOILER FAILURES

Product Number: 51300-07444-SG
ISBN: 07444 2007 CP
Author: J. J. Dillon, P. B. Desch, and S.H.M. Vrijhoeven
Publication Date: 2007
$20.00
Picture for 07447 CORROSION AND STRESS RELATED BOILER TUBE FAILURES CASE HISTORIES
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07447 CORROSION AND STRESS RELATED BOILER TUBE FAILURES CASE HISTORIES

Product Number: 51300-07447-SG
ISBN: 07447 2007 CP
Author: E. M. Labuda, D. A. Cline, and E. H. Hull,
Publication Date: 2007
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