Study On The Erosion Wear Behaviors And Mechanisms Of Several Materials

Solid particle erosion is an important reason of material failure in a number of engineering systems such as material transport pipe lines, coal liguefaction/gasificaion plants, thermal power plants, aircraft gas turbine engines. The research on erosion behaviors and wear mechanisms of materials is necessary for choosing materials appropriately.The erosive wear behaviors of five engineering materials, include A3 steel, 1Crl8Ni9Ti stainless steel, high chromium cast iron, PTFE and corundum, were studied by an air blast tester under ambient. The effects of impact angle, particle velocity, erodent size and impact time were demonstrated. Observing optical micrographs and using SEM to examine the worn surface morphology explored the wear mechanisms of materials. The results are listed as following: ①The anti-erosion proportion of A3 steel and 1Cr18Ni9Ti stainless steel is not good. High chromium cast iron has higher erosion resistance at lower impact angle, while the erosion resistance is worse for the lower toughness at normal impact. The erosion resistance of PTFE is worst for the lower intensity. ②The dominant parameters on the anti-erosion proportion of materials are rigidity and intensity at lower impact angle, while the main parameter is toughness at normal impact.The Ni-based alloy coating and Ni-based alloy/SiC coating have been obtained by laser cladding. The microstructure, compose, hardness and erosion resistance of the coatings have been studied. The wear mechanisms were explored. The results reveal that the erosion resistance of the coatings is obviously superior to A3 steel. The maximum erosion peak of the coating tends to an angle of 30°. SEM analysis the worn surface morphology shows the following results: microcutting is the main wear mechanism of the coatings when impacted at lower angle, while the dominant mechanisms change into extrusion and platelet.