Capability of austenitic steel to withstand cyclic deformations during service at elevated temperatures
Safe design for structures with steels for elevated temperatures necessitates screening these materials on the basis of objective criteria for ductility, besides screening them on elevated temperature strength. Because creep and fatigue damage may occur during operation, the ductility of a steel after a long operation time is more important than the ductility in the as delivered condition. Results of an investigation into the ductility of austenitic Cr--Ni-steels are described. In order to determine the capability of the steels to withstand cyclic plastic deformations in the aged condition, various aging treatments were applied before determining the ductility in low- cycle fatigue testing. Correlating the ductility with the sizes of the carbide precipitates made it possible to predict the ductility behavior during long service times. This led to the conclusion that for an austenitic steel with a high thermal stability (17.5 percent Cr--11 percent Ni) the ductility can decrease considerably during service at elevated temperature. Nevertheless it is expected that the remaining ductility of such steels in aged condition will be amply sufficient to withstand the cyclic deformations that occur during normal service. (auth)
- Research Organization:
- TNO, Apeldoorn/Zeud, Netherlands
- NSA Number:
- NSA-33-026766
- OSTI ID:
- 4012620
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
*STAINLESS STEEL-316-- DEFORMATION
360103* --Materials--Metals & Alloys--Mechanical Properties
AGING
CREEP
DUCTILITY
HIGH TEMPERATURE
N50230* --Metals
Ceramics
& Other Materials--Metals & Alloys--Properties
Structure & Phase Studies
RUPTURES
VERY HIGH TEMPERATURE