Author(s): Abreu, Hamilton Ferreira Gomes de ; Carvalho, Sheyla Santana de ; Lima Neto, Pedro de ; Santos, Ricardo Pires dos ; Freire, Válder Nogueira ; Silva, Paulo Maria de Oliveira ; Tavares, Sérgio Souto Maior
Date: 2022
Origin: Oasisbr
Subject(s): Corrosion; Austenitic stainless steel; Induced martensite
In austenitic stainless steels, plastic deformation can induce martensite formation. The induced martensite is related to the austenite (γ) instability at temperatures close or below room temperature. The metastability of austenite stainless steels increases with the decreasing of stacking fault energy (SFE). In this work, the deformation induced martensite was analyzed by X ray diffraction, electron back scatter diffraction (EBSD), magnetic methods and atomic force microscope (AFM) in samples of a low SFE austenitic stainless steel, AISI 301LN and compared with a medium SFE stainless steel, AISI 316L. Both techniques, X ray diffraction and EBSD, presented similar quantities for the α’-martensite. Texture results indicate that the crystallographic orientation of the formed α’- martensite is {001}<110> and {103}<110>. The morphology of α’-martensite was analyzed by AFM. Corrosion tests showed that deformation reduces pitting corrosion and generalized corrosion resistance in both steels.
