Features of brittle damages and hydrogen impregnation of high-pressure boiler tube metal
A significant number of failures encountered in high-pressure steam boilers of thermal electric power stations are caused by damage of the tubes of the steam superheaters, which are made of 20, 12Kh1MF, 12Kh2MFSR and 12Kh18N10T steels. A statistical analysis made by the authors determined that a large number of the failures result from the action of hydrogen on the tubes. In this paper, the mechanisms of hydrogen diffusion, corrosion crack propagation, and brittle failure for steam superheater tubes were analyzed. Hydrogen-related intergranular cracking and thermal fatigue were assessed for the tube steels. It was concluded that hydrogen had a significant effect on processes of crack origin and propagation both in the superheater and in the unheated tubes of the boilers.
- OSTI ID:
- 6115669
- Journal Information:
- Sov. Mater. Sci. (Engl. Transl.); (United States), Vol. 23:4; Other Information: Translated from Fiz.-Khim. Mekh. Mater.; 23: No. 4, 83-86(Jul-Aug 1987)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
STEAM LINES
DAMAGE
STEELS
HYDROGEN EMBRITTLEMENT
SUPERHEATERS
BRITTLENESS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION FATIGUE
CORROSIVE EFFECTS
CRACK PROPAGATION
FAILURE MODE ANALYSIS
FRACTURE PROPERTIES
FRACTURES
HYDROGEN
INTERGRANULAR CORROSION
STEAM GENERATORS
STEEL-12KH1MF
THERMAL FATIGUE
THERMAL POWER PLANTS
ALLOYS
BOILERS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CORROSION
ELEMENTS
EMBRITTLEMENT
FAILURES
FATIGUE
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
MANGANESE ADDITIONS
MANGANESE ALLOYS
MECHANICAL PROPERTIES
MOLYBDENUM ADDITIONS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NONMETALS
POWER PLANTS
SILICON ADDITIONS
SILICON ALLOYS
STAINLESS STEELS
SYSTEM FAILURE ANALYSIS
SYSTEMS ANALYSIS
VANADIUM ADDITIONS
VANADIUM ALLOYS
VAPOR GENERATORS
360105* - Metals & Alloys- Corrosion & Erosion