Study on prediction model of cavitation erosion incubation period of duplex stainless steel surfacing layer in a benign medium

In order to estimate the cavitation incubation period of duplex stainless steel (DSS) under ultrasonic cavitation erosion (CE), this paper analyzed the loading process of material during ultrasonic CE. Local strain theory, cumulative damage theory, and Bernoulli probability model were used to derive the minimum number of cavitation impacts required for the initiation of fatigue cracks, and the predictive equation of the material cavitation incubation period was given. DSS was obtained by tungsten inert gas welding (TIG) powder surfacing method. Tensile test and ultrasonic CE test were performed, and the tensile test data were used to calculate the cavitation incubation period by using the predictive equation. Due to the possible presence of precipitates and micro-cracks in the sample, there was an error between the calculated and the test results. The results showed that the max error between the calculated results and the test results was 8.1%, and the errors of the remaining two groups were within 3.5%.