STP567

    Applied Cavitation Erosion Testing

    Published: Jan 1974


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    Abstract

    When a material has to be applied on locations where cavitation is expected, the resistance against uniform material removal from the surface (Re) and the resistance against pit formation (rp) are of paramount importance.

    Experiments with steels and copper-nickel alloys showed that for these materials Re is proportional to the true ultimate tensile strength (σB*) to the 2.3rd power. The tests with the steels were performed under different pressures and at different temperatures. It was found that variations in pressure and temperature did not affect the value of the power exponent. It was further shown that deformation can have a considerable and essentially unpredictable influence on the erosion resistance of materials with a relatively complicated structure. In particular grain boundary precipitation is important in this respect.

    Experiments with nitriding steel, carburizing steel, maraging steel, and two cobalt alloys in different conditions of application showed that rp is determined primarily by the structure of the materials. In this case the product of Re and rp (that is, the time to pitting tp) was found to be particularly useful for screening purposes. In the mechanism of pit formation, surface fatigue as well as corrosion can play important roles.

    Keywords:

    erosion, cavitation, erosion resistance, pit formation, strength, spalling fatigue, corrosion, metals, magnetostrictive oscillator, evaluation, tests


    Author Information:

    Tichler, JW
    Project leader, head of the Tribology Department and head of the Physical Department, Metal Research Institute TNO, Apeldoorn,

    de Gee, AWJ
    Project leader, head of the Tribology Department and head of the Physical Department, Metal Research Institute TNO, Apeldoorn,

    van Elst, HC
    Project leader, head of the Tribology Department and head of the Physical Department, Metal Research Institute TNO, Apeldoorn,


    Paper ID: STP32219S

    Committee/Subcommittee: G02.10

    DOI: 10.1520/STP32219S


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