Fatigue behavior of chromium-containing ferritic steels at elevated temperature. Final technical report, July 1, 1982-June 30, 1984
This report summarizes the activities of a research program carried out during the period 1 July 1982 to 30 June 1984. The objective of the program was to study the interactive effects of creep, fatigue, and environment in a series of ferritic steels containing various amounts of chromium and molybdenum. The particular alloys investigated were 2-1/4 Cr-1Mo, Mod 9Cr-1Mo, 9Cr-2Mo, 12Cr-1Mo, and 12Cr-2Mo alloys. The test program included creep testing, cyclic creep studies, and low cycle fatigue tests in air and in vacuum at elevated temperature. Whereas other creep-fatigue programs have often been directed at an assessment of the effect of creep on fatigue, a different approach has been adopted in this program, namely we have taken the creep lifetime as the baseline and have explored the effect of periodic off-loading on creep behavior. This has led to an assessment of fatigue behavior at elevated temperatures under R = 0 loading conditions rather than the traditional R = -1 loading. Some interesting and perhaps unexpected results have emerged from this portion of the study. The stability of the alloys in terms of microstructure has also been investigated for a number of test conditions. A short review of low cycle fatigue studies which have been performed on these alloys is presented to provide a background to the current work on cyclic creep studies. Following this background is a discussion of the results and observations stemming from this study. 19 refs., 11 figs., 6 tabs.
- Research Organization:
- Connecticut Univ., Storrs (USA). Dept. of Metallurgy
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5625946
- Report Number(s):
- UC/MET-22278-01; ON: DE85012309
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHROMIUM-MOLYBDENUM STEELS
CREEP
FATIGUE
FERRITIC STEELS
AIR
EXPERIMENTAL DATA
HIGH TEMPERATURE
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
DATA
FLUIDS
GASES
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
NUMERICAL DATA
STEELS
360103* - Metals & Alloys- Mechanical Properties