STP821

    Application of Ultrasonic Fatigue Testing Techniques to the Evaluation of the Corrosion-Fatigue Strength of Materials

    Published: Jan 1984


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    Abstract

    A corrosion fatigue testing system has been developed for examining the corrosion-fatigue strength of engineering materials in the very high cycle regime (109 to 1010 cycles) typical of many design lifetimes. Central to this resonant fatigue testing system is a high efficiency, large displacement, piezoelectric transducer which operates at a frequency of 20 kHz, thus enabling the accumulation of large numbers of cycles in a reasonable amount of time. A description of apparatus, environmental controls, and testing method is presented. Experimental 20 kHz and low frequency corrosion fatigue results for a number of engineering materials, including a 12% chromium stainless steel, show similar reductions in fatigue limit at a specified number of cycles, despite the difference in frequency. This result holds for a variety of aqueous environments with and without electrochemical controls imposed during testing. The data illustrate the capabilities of the ultrasonic corrosion-fatigue technique and are analyzed to assess its advantages and limitations.

    Keywords:

    ultrasonic fatigue, corrosion fatigue, mechanical properties, pitting, environment sensitivity, AISI 403 alloy, 17-4 PH alloy, Ti-6Al-4V alloy


    Author Information:

    Roth, LD
    Materials Engineering Department, Westinghouse R&D Center, Pittsburgh, Pa.

    Willertz, LE
    Pennsylvania Power and Light Company, Allentown, Pa.


    Paper ID: STP34451S

    Committee/Subcommittee: G01.06

    DOI: 10.1520/STP34451S


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