Fatigue curves for annealed and normalized and tempered 2{1/4}Cr-1Mo steel

Book · Fri Dec 01 04:00:00 EST 1995

OSTI ID:136866

Lawton, C W ^[1]

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1. Lawton Scientific Inc., West Hartford, CT (United States)

Fatigue failure data from the literature have been compiled on 2{1/4}Cr-1Mo steel in this report. The data covers the temperature range of 80 F--1,100 F (26.7 C--593 C). An average failure curve was developed at temperature where data were available. The annealed and normalized and tempered fatigue failure data was reduced to a common strength base with the aid of an analytical stress versus strain equation to determine the elastic and plastic strain ranges from the average total strain ranges at each temperature. For the 2{1/4}Cr-1MO steel regardless of initial strength level, very little difference was found in low cycle fatigue strength. The present practice used by the ASME Subgroup on Fatigue of the ASME Boiler and Pressure Vessel Code was used to develop Fatigue Design Curves. A reduction factor of 20 was applied to failure cycles on the plastic strain range curves to determine the plastic strain ranges and a reduction factor of 2 on the failure elastic strain range curves to determine the elastic strain ranges. At each cycle the design curve is the sum of the calculated plastic and elastic strain ranges. For this material the use of elastic stress analysis at 850 F (454 C) is dependent on the magnitude of the primary stress (S{sub m}) used for design. At the higher allowable primary stresses there is sufficient creep strain to decrease fatigue life.

• OSTI ID: 136866
• Report Number(s): CONF-950740--; ISBN 0-7918-1344-4
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
42 ENGINEERING
COMPILED DATA
DATA ANALYSIS
FATIGUE
MATERIALS
PRESSURE VESSELS
STANDARDS
STEEL-CR2MO
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K