Abstract
A water-jet erosion test was carried out on grade-A ship steel to study the interaction and erosion mechanism of the water jet on the steel surface. When the water jet impacted, a STSS-1 stress-detection module was used to collect the dynamic strain signal on the rear of the ship’s plate, and a scanning electron microscope, transmission electron microscope, X-ray diffractometer, and other equipment were used to analyze the microstructure and phase of the grade-A ship steel before impact. The surface morphology of the material after impact was studied and analyzed. The impact stress of the water jet on the grade-A steel was an alternating stress, and the jet pressure decayed in the radial direction. The material surface was fatigued under the action of the jet alternating stress. After the water-jet erosion, the central area of the grade-A steel was dominated by an elongated cementite hard phase, and the peripheral area had a pearlite structure. A model for the jet erosion and peeling of grade-A ship steel was established to clarify the mechanism of erosion by the water jet.
Highlights
As a new surface-treatment technology, high-pressure water-jet technology achieves material cutting and surface cleaning and polishing through the ultra-high impact kinetic energy of the water jet [1,2,3]
Long-term jet impact causes erosion damage to the surface of the ship plate base, which results in a decrease in mechanical properties of the steel plate surface, and affects the service life of the ship
A cementite structure was present in the grade-A steel. e position, shape, and size of the steel had a significant impact on the steel performance
Summary
As a new surface-treatment technology, high-pressure water-jet technology achieves material cutting and surface cleaning and polishing through the ultra-high impact kinetic energy of the water jet [1,2,3]. E optimal target distance during cleaning was 5 D, and the jet had a diameter greater than 26 D in the axial direction and 1.68 D from the centerline. Positions beyond this reach could not be cleaned. Insufficient pressure during water-jet cleaning and rust removal of ship plates increases the impact time to achieve better cleaning results. An energy spectrometer (EDS) was used to study and analyze the microstructure and phase of the material before the impact of the grade-A ship steel jet and the surface morphology of the material after the impact of the water jet. Shock and Vibration analysis of the microstructure and morphology, the interaction between the water jet and the grade-A ship steel and the erosion mechanism were studied, and a grade-A ship steel jet erosion and peeling model was established
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