Effect Of Rare Earth Ce On Microstructure,corrosion Resistance And Antibacterial Property Of 1Cr17 Stainless Steel

1Cr17Ce stainless steel is a new functional materials, it has the inherent characteristics of stainless steel, but also with antibacterial function. The object of this thesis are two kind of different materials which was smelted by ZG-0.01 vacuum medium frequency induction furnace and WS-4 non-consumable vacuum arc furnace with pure iron, pure chromium, carbon, rare earth element(cerium) as raw materials. We analyze the effect of cerium on the metallographic structure of 1Cr17 by observing the metallographic structure, analysing the inclusion and composition, testing the hardness; study the corrosion resistance and antibacterial effect of Ce-bearing 1Cr17 stainless steel through the cycle of immersion test, detection of corrosion potential, polarization curves and antibacterial testing. Using the method of coating analysis the antibacterial property of 1Cr17Ce, the results indicate that the stainless steel shows an excellent antibacterial property when the content of Ce is 0.21%, and more content of Ce can not increase the antibacterial property, on the contrary it will worsen the microstructure and corrosion resistance property.The analysis of cerium on the metallographic structure of 1Cr17 show that the microstructure of 1Cr17 is small and have more uniformity distribution of element when the content of Ce in the proper range, The hardness of the material also increase due to the resistance to dislocation motion. When rare earth exceed the best content, the excessive of Ce can generate a lot of binary compound and multiple compounds and cause Partial clustering and make coarsening of microstructure, then drop the hardness value. Rare earth impurities in the slag phase reaction of excess residual are not excluded in the steel melt reactants formed a large number of inclusions in the uneven distribution of liquid steel in the process of force is easy to produce stress concentration, resulting in decreased hardness. The corrosion resistance and antibacterial test of Ce-bearing stainless steel showed that the corrosion resistance of stainless steel increase with the Ce content increasing when the content in designated range. In the experimental period, stainless steel has the same corrosion rule, indicating that the addition of cerium purified liquid steel, decreasing the number of micro-battery, so that make the film more stable and densification and improving the corrosion resistance of stainless steel.The analysis of experimental data concluded that rare earth in steel within a certain range can improve the shape of inclusion, grain refinement, clean steel. But when the content exceeds a certain number, it worsen the performance of stainless steel itself. In this paper, we have given the best range of Ce content in 1Cr17 stainless steel, and in this region must exist a best content, which not only guarantee the basic usage of 1Cr17, but also has excellent antibacterial properties.