The Effect Of Rare Earth Ce On Inhibitor During The Thermal Deformation Of Cu-containing Grain-oriented Silicon Steel

Oriented silicon steel is an important functional soft magnetic material,mainly used in the manufacture of transformers in the power transmission industry.Due to the complex production process and strict process requirements and manufacturing technology,oriented silicon steel does not have a high rate of production and has a high production cost,and is known as the"artwork of special steel".The good magnetic properties of oriented silicon steel are due to its excellent Gaussian weave?i.e.{110}<001>weave?.Inhibitors are indispensable for obtaining an excellent Gaussian structure,as they act to inhibit primary recrystallization by finely dispersed inhibitor particles and to accumulate energy for secondary recrystallization.Among the many polymetallic symbiotic deposits in China,the Bayan Obo mining area is the one with the largest amount of rare earths,with iron,niobium,rare earths and other metals.The study of inclusions and precipitates in the cast state and the precipitation behavior of inhibitors in the hot rolling process was carried out for cerium oriented silicon steels,providing more valid data for the development of a more rational hot rolling process and the rational application of cerium in oriented silicon steels.In this paper,the influence of cerium on Cu-oriented silicon steel is investigated with reference to the actual hot-rolling process of a steel mill in China,and the influence of cerium on Cu-oriented silicon steel is investigated with the use of rare earth cerium as a variable.The inclusions of the oriented silicon steel cast state were graded,and the inhibitor precipitates of the oriented silicon steel cast state were analyzed by transmission electron microscopy,and the ingot homogenization simulation was performed in a box furnace,followed by simulated hot rolling of the test steel by a laboratory two-roll hot rolling mill,and the behavior of the inhibitor precipitates during hot rolling was analyzed by transmission electron microscopy.The results show that the addition of rare earth cerium reduces the number and size of as-cast inclusions in oriented silicon steel,which can change the shape of inclusions and remove harmful inclusions.The number of precipitates decreases and the size increases slightly;in the process of simulating soaking of ingots,there are still undissolved precipitates,which are analyzed by EDS as large-size?Mn,Cu?S,and increase with the soaking time The number of precipitates in the experimental steel decreases,and the size decreases accordingly.In the process of hot rolling and rough rolling,the precipitated inhibitors are mainly Cu₂S,MnS,and?Mn,Cu?S.During the simulation of hot rolling and rough rolling,As the number of hot rolling passes increases,the amount of inhibitor precipitation gradually increases,and the size of inhibitor precipitation gradually decreases;the amount of inhibitor precipitation of experimental steel added with rare earth cerium is less than that of experimental steel without added rare earth,and the size of inhibitor precipitation should also be Compared with the experimental steel without rare earth,the addition of rare earth cerium can make the inhibitor more fine and uniformly distributed.