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RESEARCH PAPERS

The Influence of Load Ratio and Temperature on the Near-Threshold Fatigue Crack Growth Rate Properties of Pressure Vessel Steels

[+] Author and Article Information
P. K. Liaw, W. A. Logsdon

Metallurgy Department, Westinghouse R/D Center, Pittsburgh, Pa. 15235

J. Eng. Mater. Technol 107(1), 26-33 (Jan 01, 1985) (8 pages) doi:10.1115/1.3225767 History: Received February 27, 1984; Online September 23, 2009

Abstract

Near-threshold fatigue crack propagation behavior was examined in four pressure vessel steels (SA508 Cl 2a, SA533 Gr A Cl 2, SA508 Cl 3a, and SA533 Gr B Cl 2) and two submerged arc weldments (SA508 Cl 2a and SA533 Gr A Cl 2). At a given temperature and load ratio, near-threshold crack growth rates in the four base materials and two submerged arc weldments were essentially identical. Increasing the load ratio from 0.20 to 0.50 increased the rate of near-threshold crack propagation at a given temperature. At a fixed load ratio, increasing the temperature from 24 to 288°C (75 to 500°F) increased the rate of near-threshold crack growth. The effects of load ratio and temperature on the near-threshold crack growth behavior of pressure vessel steels can be explained based on a crack closure concept.

Copyright © 1985 by ASME
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