Evolution of Crystallographic Texture, Grain Growth and Corrosion Resistance of an SAE 1075 Steel Subjected to Different Thermomechanical Treatments

The present work addresses the different manufacturing routes through which a 1075 pearlitic steel can pass in order to improve its resistance to severe corrosion conditions. Taking into account the use of this material in marine environments, such as offshore oil exploration pipelines, this type of steel must have a microstructure resistant to such conditions. Thus, this eutectoid steel was evaluated in its condition as received and subsequently submitted to cold rolling and full annealing, to change its microstructure, namely, with reductions of 25 and 50% with subsequent heat treatment of 900°C in both reductions and with two different times. After evaluating their microstructures and noticing significant changes in their crystallographic textures, through SEM/EBSD techniques such as Cube, Goss and Brass components, these samples were subjected to electrochemical tests to evaluate their corrosion resistance in a synthetic seawater solution, highlighting the highest polarization resistance for the Goss component and family of plans {011}. Subsequently, a 24-hour immersion test was used for each sample in the synthetic seawater solution and the presence of oxides and salts that attenuated corrosion on the surface of the sample with a family of {011} planes like Akaganeite (β-FeOOH) and Ferroxyhyte (δ-FeOOH) were confirmed by Raman spectroscopy.