Comparative Analysis of Creep Cavitation Damage in 0.5Cr-0.5Mo-0.3V Steel after Long-Term Creep Exposure by Metallography and Replica Testing

Zdeněk Kuboň; Lenka Pekařová; Jana Kosňovská; Pavel Poštulka

doi:10.4028/www.scientific.net/MSF.891.335

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HomeMaterials Science ForumMaterials Science Forum Vol. 891Comparative Analysis of Creep Cavitation Damage in...

Comparative Analysis of Creep Cavitation Damage in 0.5Cr-0.5Mo-0.3V Steel after Long-Term Creep Exposure by Metallography and Replica Testing

Abstract:

Complex metallographic analysis was performed on the steam pipe elbow made of 0.5Cr-0.5Mo-0.3V steel after long-term (more than 240 000 hours) of operation at elevated temperature that revealed the extensive creep damage on the outer surface of the pipe elbow. Metallographic analysis confirmed pronounced creep damage at the outer surface but, at the same time, the non-uniform nature of the cavitation. The density of cavities continuously decreased from outer to inner pipe surface in the most damaged area and rapidly waned along the circumference as well as the length of the elbow. Parallel evaluation of actual extent of the cavitation damage made by metallography and replica methods in various parts of the pipe elbow confirmed that replica method is capable to describe and quantify the cavitation damage of this steel in the same way as metallography, including evaluation of creep damage according to Nordtest NT TR 302.

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Periodical:

Materials Science Forum (Volume 891)

Pages:

335-340

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.891.335

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Online since:

March 2017

Authors:

Zdeněk Kuboň*, Lenka Pekařová, Jana Kosňovská, Pavel Poštulka

Keywords:

Cavitation, Creep Damage, Metallography, Pipeline Elbow, Replica Testing, Steel 0.5Cr-0.5Mo-0.3V

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References

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