| Autor: |
Bogachev, V., Sanakina, V., Starchikov, S., Timonin, I. |
| Zdroj: |
Power Technology & Engineering; Jan2008, Vol. 42 Issue 1, p50-54, 5p |
| Abstrakt: |
Coils of 12Kh18N12T steel become magnetized during operation because the surface layer of the metal at the scale boundary is depleted in chromium and enriched in ferromagnetic nickel. A large-scale study of the relationship between the thickness of the altered layer and the operating temperature and individual service life is underway at Mosénergo’s TÉTs-26 heating and electric power plant. Ferritometry and selective replacement have made it possible to reduce the amount of strain-induced and embrittlement damage and to extend the service life of steam superheaters. This could not be done by traditional methods, in particular ultrasonic monitoring of the wall thickness. The data obtained here can serve as a basis for creating a new technique for monitoring thermal inhomogeneity in steam superheaters made of austenitic steels. The advantages of ferritometric monitoring include the following: special preparation (cleaning) of coils is not required, the measurements are convenient, and segments with the highest temperature can be detected. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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