Fatigue behavior of chromium-containing ferritic steels at elevated temperature. Final technical report, July 1, 1982-June 30, 1984

Technical Report · Mon Apr 29 04:00:00 EDT 1985

OSTI ID:5625946

McEvily, A J; Bunch, J

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
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
AIR
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-MOLYBDENUM STEELS
CREEP
DATA
EXPERIMENTAL DATA
FATIGUE
FERRITIC STEELS
FLUIDS
GASES
HIGH TEMPERATURE
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
NUMERICAL DATA
STEELS