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Development of a design methodology for high-temperature cyclic application of materials which experience cyclic softening

Technical Report ·
DOI:https://doi.org/10.2172/5633723· OSTI ID:5633723
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The project described in this report has, as its beginning, two investigations, the first a study of the effect of material softening on the overall structural stability of complex components, and the second an evaluation of damage induced through cyclic loads combined with high temperature environmental effects. The initial work was carried out on one grade of 2.25Cr 1Mo steel, with the intention of extending the investigation to other grades once the investigative techniques had been settled. However, considerable interest has grown in the application of modified forms of austenitic steel to very high temperature use in superheaters and reheaters. The ability to utilize these materials can mean an increase of 100{degree}C in the top temperature in a power plant, which converts into a significant improvement in thermal efficiency for a very small investment in material. Therefore, the direction of this project has been modified to continue on this class rather than the ferritic alloys originally under consideration. The basic problem to be investigated in the austenitics is the concern for possible strength variations, either positive or negative, induced in the very complex microstructures by service conditions of cyclic load and high temperature. 23 refs., 31 figs., 6 tabs.
Research Organization:
Illinois Univ., Urbana, IL (USA). Dept. of Mechanical and Industrial Engineering
Sponsoring Organization:
DOE/FE
DOE Contract Number:
AC05-84OR21400
OSTI ID:
5633723
Report Number(s):
ORNL/Sub-85-55904/1; UILU-ENG--88-4011; ON: DE90001585
Country of Publication:
United States
Language:
English

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Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
20 FOSSIL-FUELED POWER PLANTS
200104 -- Fossil-Fueled Power Plants-- Components
36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
AUSTENITIC STEELS
CHROMIUM ALLOYS
COAL GASIFICATION
CREEP
DEFORMATION
FATIGUE
FOSSIL-FUEL POWER PLANTS
GASIFICATION
HIGH TEMPERATURE
IRON ALLOYS
IRON BASE ALLOYS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
MOLYBDENUM ADDITIONS
MOLYBDENUM ALLOYS
POWER PLANTS
STEELS
STRAINS
STRESSES
SUPERHEATERS
TEMPERATURE EFFECTS
TENSILE PROPERTIES
THERMAL POWER PLANTS
THERMOCHEMICAL PROCESSES