Display method for microstructure of high manganese steel

Two methods for displaying the microstructure of high manganese steel with different manganese contents were introduced. Using oxalic acid＋nitric acid＋sodium metabisulfite＋anhydrous ethanol solution as the corrosion solution, wear－resistant high manganese steel with a manganese content of 11% to 14% was corroded at room temperature, resulting in clear, complete and brightly colored microstructure morphology. The composite method of nitric acid＋anhydrous ethanol solution and hydrochloric acid＋anhydrous ethanol solution was used to corrode high manganese steel in ultra－low temperature environments with a mass fraction of manganese elements ranging from 22% to 28%, and clear microstructure morphology could be obtained.