DOI: https://doi.org/10.15587/1729-4061.2015.40196

Research of erosion resistance of superficial layers of steels under cavitation

Владимир Иванович Коваленко, Людмила Ивановна Мартыненко, Владимир Григорьевич Маринин

Abstract


Fracture resistance of low-alloy steels 15KH1M1F, 25KH1MF, 25KH1M1F, 20KH1M1FTR and steels 20KH13, 15KH11MF, 15KH12VNMF without and with thermomechanical treatment under intense cavitation on the sample surface was investigated. Cavitation was generated by exponential-profile ultrasound emitter. The emitter end surface varies with the frequency of 20 kHz and amplitude of 30±2 microns. Erosion measurements of samples were conducted by gravimetric method. Measurement accuracy was ±0,015 mg. According to the measurements, the dependences of the erosion on the cavitation exposure time were constructed. For quasi-linear plots of kinetic curves, the destruction rate of the samples was calculated and their cavitation resistance was determined. The interrelation of resistance ( ) with microhardness (Нm) for low-alloy steels in the form of ~С  when measuring Нmin GPa was revealed. For more alloyed steels, the exponent is reduced to 2. Nitriding, hardening of coatings increase the resistance of the samples. When applying a vacuum arc coating on the heat-treated surface of the sample, its cavitation resistance is reduced by the value that depends on the coating formation process parameters.


Keywords


steel; superficial layer; modification; erosion; analytical relationship; resistance; microhardness; coating

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Copyright (c) 2015 Владимир Иванович Коваленко, Людмила Ивановна Мартыненко, Владимир Григорьевич Маринин

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ISSN (print) 1729-3774, ISSN (on-line) 1729-4061