Experimental Study On Cavitation Erosion Resistance Of New Bainite Materials In Hydraulic Machinery

Cavitation erosion is a microscopic,instantaneous and stochastic complex phenomenon.It exists extensively in the process of fluid machinery,especially in the operation of hydraulic machinery.Because the complexity of the cavitation erosion process,no complete theoretical analysis system has been established yet.Due to the cavitation erosion damage on the surface of the overcurrent components of the hydraulic machinery,the equipment vibration is aggravated,the performance is reduced,the life is reduced and the production efficiency is reduced.Therefore,the losses caused by cavitation erosion damage in hydraulic machinery parts are immeasurable?so,the study of cavitation erosion resistance characteristics of hydraulic machinery overcurrent components is not only of far-reaching theoretical significance,but also of great engineering practical significance.The author has analyzed the theoretical research and experimental methods of the cavitation wear of hydraulic machinery at home and abroad,determined the research content,and designed the research program.And 30Si1Mn2Cr1 Ni Mo VTi Xt material as the research object,while using ZG06Cr16Ni5 Mo stainless steel,0Cr18Ni9 stainless steel and Q235 ordinary carbon structural steel as the material,under the same conditions to complete the cavitation erosion experiment.By collecting the data of the weight loss of the test piece,the observation of the macroscopic appearance of the test piece and collecting the surface microscopic images of the test piece,a comprehensive comparative analysis was conducted to determine the pros and cons of the anti cavitation erosion performance of the four materials.The following work was mainly carried out:(1)The driveshaft,turntable,and water container are designed separately,matching motors are selected,and a turntable experimental device is set up.(2)Analyze the physical properties of the four materials and formulate test and analysis methods for the experimental materials.(3)Visual observation method was used to observe the four areas of the turntable,and the best cavitation erosion location was determined for each area.Experiments were carried out to verify the results.The test specimens were weighed,macroscopically observed and microscopically observed to determine the best cavitation erosion location in each area.(4)Based on the above experiments,four kinds of test pieces were respectively installed in the best cavitation erosion positions in each area,and cavitation erosion experiments were performed.By weighing the specimens,macroscopically observing the surface,microscopically observing the image,and grading the images,the cavitation erosion damage of the four specimens was compared,and the advantages and disadvantages of the cavitation erosion resistance of the four specimens were comprehensively evaluated.The results show that the anti cavitation erosion properties of ZG06Cr16Ni5 Mo and 0Cr18Ni9 are better in the four materials,and the anti cavitation erosion performance of 30Si1Mn2Cr1 Ni Mo VTi Xt is poor,and Q235 is in between.Finally,the reasons for the poor resistance to cavitation erosion of 30Si1Mn2Cr1 Ni Mo VTi Xt material were analyzed,and some suggestions were made for the material preparation.