Determination of hardness and wear resistance of steel samples by the ultrajet method
The physical and mechanical properties of a material on the surface can be determined by exposing it to a high-speed liquid jet, that is, an ultrajet. However, there are still very few theoretical and experimental studies that expand the scientific understanding and make it possible to use ultrajets in diagnostics. In this study, a water jet impact on the surface of the 37H2NVMBR stainless steel barrier at a speed of 350 m/s is analyzed by the finite element method. Theoretical data are verified experimentally on samples under different heat treatment conditions. In addition, the samples are tested on dry friction and the theoretical data are compared with the experimental results. The study shows that there exists a linear dependence with a high degree of correlation between the depth of a hydrocavity formed by the ultrajet impact, hardness of the sample, and the mass loss due to dry friction. This makes it possible to use the ultrajet diagnosis as an alternative for the rapid determination of the abrasion resistance of a material.