Abstract: Detection of three-dimensional morphology, size distribution and chemical composition of inclusions in heavy rail steel was performed using electrochemical corrosion methods with non-aqueous electrolytes. The experimental results show that the strip-like MnS inclusion in rolled steel rails, irregular MnS and carbonitride, and spherical oxide were obtained and deduced that MnS was formed in bloom by precipitation and growth on the oxide inclusion which had acted as the heterogeneous nucleation site for MnS precipitation. Due to electrode potentials were existed in the non-uniform of face of steel sample, a lot of micro batteries will be formed in different regions of steel matrix. The surrounding areas of MnS particles are highly susceptible to anodic attack, resulting in variations in pit initiation and development, until the steel matrix around the inclusions is completely dissolved out. The current electrochemical corrosion method could efficiently achieve the relevant information of inclusions in the steel.
Authors: Xue-wei Zhang, Cai-fu Yang, Feng Chai, Xiao-bing
Luo, and Li-feng Zhang
Keywords: 3D morphology, Electrochemical corrosion,
Non-metallic inclusions, Steel