Effect Of Rare Earth Y On Microstructure And Corrosion Property Of 0Cr13 Stainless Steel

With the rapid development of modern industry, the increasing amount of stainless steel and the development of ferrite stainless steel with low-chromium and good comprehensive performance has become one of the main research directions. In addition to the requirements of steel with high strength and toughness, good oxidation and corrosion resistance are also required, in which rare earth can play an important role. The rare earth elements in stainless steel trace in solid solution in steel, purification the grain boundary, metamorphic inclusions and refines grains, thereby improved the corrosion of steel.Effect of rare earth element Y on 0Cr13 stainless steel microstructure and corrosion resistance ware studied in this paper. The effect of Y on 0Cr13 stainless steel microstructure is studied by observing the microstructure, analyzing inclusions shape and components. The effect of 0Cr13 stainless steel corrosion resistance is studied by immersion cycles, corrosion potential monitoring and measurement of corrosion AC impedance.The results showed that residues of rare earth increase with the increase of rare earth content of rare earth stainless steel. Rare earth elements Y improved significantly the organization of 0Cr13 stainless steel in the forging of state organizations. With the increase of rare-earth content organization was detailed clearly.But the effect of rare earth on the stainless steel refining organizations has a limit. The rare earth will be reflected in the deterioration role when the contents exceed this limit. Organizations in the heat-treated stainless steel, the addition of rare earth mixed crystal phenomenon can be reduced, so that organizations become more homogeneous. In the same Organizations state, the reaction between the rare earth elements Y and O, S and Mn reduces harmful low-melting-point elements and plays a role in liquid crystal purification. The rare earth elements Y modifications inclusions in 0Cr13, so high melting point inclusions formats, which distributions in the grain boundary.The ccorrosion experiments show that the addition of rare earth elements Y increase the chemical corrosion resistance of stainless steel 0Cr13 and corrosion rate decreased obviously. With the extension of soaking time, the corrosion resistance of stainless steel 0Cr13 law does not change. Both 60 days of immersion and 15 days of immersion have the same law. But with the extension of soaking time, the sample's surface form the dense passive film to prevent to contact with the outside world and enhance the corrosion resistance ability. The addition of rare earth can increase the hardness of stainless steel 0Cr13 significantly. With the rare earth element Y content increased, the hardness of stainless steel increased. The effect of rare earth elements on the hardness has a limit. The impact gradually reduced or even deteriorated when close to the limit.