SYMPOSIA PAPER Published: 01 January 1969

Some Microstructural and Alloying Effects Upon Low-Cycle Fatigue Life of Pressure Vessel Steels


Loading by constant deflection reversed bending was applied to Lehigh cantilever fatigue specimens of a plain carbon steel, A-516, and three low-alloy steels, A-302, A-387B, and HY-80. Fatigue life over the 5000 to 100,000 cycle range was investigated at a loading frequency of 200 cpm. The effect of microstructure was observed by comparing the fatigue resistance of specimens of equal tensile strength but different heat treatment histories. Normalized structures proved to be superior to the corresponding spray quenched and tempered conditions when using total strain range as the test parameter. Where similar structures were compared, the 100,000 cycle fatigue life was found to be related to tensile strength. The fatigue resistance of the low-alloy steels was influenced markedly by heat treatment while the plain carbon steel essentially was unaffected. Increased alloy content altered the slope of the fatigue curve such that the plain carbon steel tends to be superior in the 5000 cycle range, while the low-alloy steels excel above the 20,000 cycle region. This results in a grouping of the curves as to steel composition.

Author Information

DePaul, RA
ASTM, Suffern, N.Y.
Pense, AW
Lehigh University, Bethlehem, Pa.
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Developed by Committee: E08
Pages: 130–143
DOI: 10.1520/STP33653S
ISBN-EB: 978-0-8031-4581-8
ISBN-13: 978-0-8031-0016-9