Microstructure and surface oxidation behavior of an austenitic Fe-Mn-Si-Cr-Ni-Co shape memory stainless steel at 800 degrees C in air

Author(s)

Silva, R. ^[1] ; Arana, C. ^[1] ; de Sousa Malafaia, A. M. ^[2] ; Mendes Filho, A. A. ^[3] ; Pascal, C. ^[4] ; Otubo, J. ^{[5, 6]} ; Sordi, V. L. ^[1] ; Rovere, C. A. D. ^[1]

Affiliation

^[1] Univ Fed Sao Carlos, Dept Mat Engn, Munir Rachid Corros Lab, Rodovia Washington Luis Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Fed Sao Joao del Rei, Dept Mech Engn, Praca Frei Orlando 170, BR-36307352 Sao Joao Del Rei, MG - Brazil

^[3] Deakin Univ, Inst Frontier Mat, Geelong, Vic 3216 - Australia

^[4] Univ Grenoble Alpes, CNRS, Grenoble INP, SIMaP, F-38000 Grenoble - France

^[5] Technol Inst Aeronaut, Div Mech Engn, Praca Marechal Eduardo Gomes, 50 Vila Acacias, BR-12228900 Sao Jose Dos Campos - Brazil

^[6] IPEN, Nucl & Energy Res Inst, BR-05508000 Sao Paulo, SP - Brazil

• Document type: Journal article
• Source: Corrosion Science; v. 158, SEP 2019.
• Web of Science Citations: 0

Abstract

In the present research, the microstructure and oxidation behavior of an Fe-8.26Mn-5.25Si-12.80Cr-5.81Ni-11.84Co shape memory stainless steel (SMSS) was studied at 800 degrees C in air for up to 120 h. Phase changes and oxidation mechanism were discussed based on microscopy analyses, thermogravimetric measurements and thermodynamic simulations. The results show that oxidation exposure promotes the formation of the sigma, chi and ferrite phases in the metallic substrate. The oxidation behavior follows a parabolic law, with the kinetics of oxidation being controlled by the Mn2O3 oxide growth in the first hours, and by Mn3O4 and MnCr2O4 spinel growth after 24 h of exposure. (AU)

• FAPESP's process: 16/10996-4 - High temperature oxidation behavior of a Fe-Mn-Si-Cr-Ni-Co shape memory stainless steel
• Grantee: Camila Arana
• Support Opportunities: Scholarships in Brazil - Scientific Initiation