|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Environmental Degradation of Additively Manufactured Alloys
||Corrosion Behavior of Newly Developed High Toughness Mixed-phase Steels
||Neetu Verma, S. Sangal, K. Mondal
|On-Site Speaker (Planned)
Advanced steels based on bainitic or mixed-phase microstructures by proper choice of alloying represent promising candidate in alternative to conventional pearlitic steel for railway applications. In the present work, 0.61%C-1.71%Si-0.86%Mn steel has been used for the development of mixed-phase morphologies consisting of bainite, pro-eutectoid ferrite and retained-austenite by employing novel heat treatment strategies (continuous cooling followed by isothermal heat treatment). Corrosion behavior of these steels has been carried out in freely aerated 3.5wt.% NaCl solution. Dynamic-polarization, linear-polarization and immersion testing followed by detailed microstructural characterization of the surface before and after corrosion as well as the rust layer with the help of scanning electron microscopy, optical profilometry and Raman spectroscopy have indicated better corrosion resistance of the mixed-phase steel to pearlitic rail steel. The presence of higher degree of α-FeOOH in the rust phase as well as not-so-severe galvanic corrosion in the mixed-phase steels attribute to their better corrosion resistance.
||Planned: Supplemental Proceedings volume