Corrosion Versus Mechanical Tests for Indirect Detection of Alpha Prime Phase in UNS S32520 Super Duplex Stainless Steel

Autor(es)

Fontes, T. F. ^[1] ; Magnabosco, R. ^[2] ; Terada, M. ^[3] ; Padilha, A. F. ^[3] ; Costa, I. ^[1]

Afiliação do(s) autor(es)

^[1] IPEN CNEN SP, CCTM, BR-05508 Sao Paulo - Brazil

^[2] Ignatian Educ Fdn FEI, Dept Mech Engn, BR-09850901 Sao Bernardo Do Campo, SP - Brazil

^[3] Escola Politecn Univ Sao Paulo, Dept Engn Metalurg & Mat, BR-05508030 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CORROSION; v. 67, n. 4 APR 2011.
• Citações Web of Science: 6

Resumo

Alpha prime formation leads to material embrittlement and deterioration of corrosion resistance. In the present study, the mechanical and corrosion behavior of super duplex stainless steel UNS S32520 aged at 475 degrees C from 0.5 h to 1,032 h was evaluated using microhardness measurements, Charpy impact tests, electrochemical impedance spectroscopy, and cyclic polarization curves. The sensibility of these tests to the effects of alpha prime phase was investigated. The microhardness test showed a gradual increase in hardness with aging time, whereas the impact tests revealed losses of about 80% in the energy absorption capacity for the material aged for 12 h in comparison with the solution-annealed samples. The most responsive analysis was the impact test, which indirectly revealed the presence of this deleterious phase in samples aged for 0.5 h. The electrochemical impedance spectroscopy and polarization tests were not highly sensitive to the alpha prime phase unless these are present in large amounts in the stainless steel. (AU)

• Processo FAPESP: 08/54836-4 - Correlação entre microestrutura e resistência à corrosão nas ligas ODS Eurofer para reatores de fusão nuclear
• Beneficiário: Maysa Terada
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado