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Fatigue properties of high strength-low alloy steels

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Abstract

High strength-low alloy (HSLA) steels are a relatively new group of alloys similar to hot rolled low carbon steel (HRLC) but having higher strengths as a result of composition and processing variations. Because these steels are of potential use in a variety of structural applications involving cyclic loading a knowledge of their fatigue behavior is important. Fatigue experiments were performed on several 80 ksi yield strength HSLA steels and on conventional HRLC steel for comparison. The HSLA steels were all found to exhibit similar fatigue resistance, and were superior to HRLC steel at longer lives. The effects on fatigue behavior of two types of plastic prestrain were determined. While prestrains caused large increases in monotonic strength properties, such improvements were largely lost in fatigue due to cyclic softening. Tensile prestrains are more detrimental to fatigue resistance than compressive prestrains. Finally, it was found that HSLA steel has a higher fatigue notch sensitivity than HRLC steel, however its notch fatigue resistance is still superior to that of HRLC steel.

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Authors and Affiliations

  1. Metallurgy Department, Ford Motor Company, P.O. Box 2053, 48121, Dearborn, Mich.

    A. M. Sherman (member of the Scientific Research Staff)

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  1. A. M. Sherman
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Sherman, A.M. Fatigue properties of high strength-low alloy steels. Metall Trans A 6, 1035–1040 (1975). https://doi.org/10.1007/BF02661357

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