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Master's Dissertation
DOI
10.11606/D.85.2009.tde-06112009-160837
Document
Author
Full name
Talita Filier Fontes
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2009
Supervisor
Committee
Costa, Isolda (President)
Magnabosco, Rodrigo
Ramanathan, Lalgudi Venkataraman
Title in Portuguese
Efeito da fase alfa linha nas propriedades mecânicas e de resistência à corrosão do aço inoxidável duplex UR 52N+
Keywords in Portuguese
475 oC
Aço inox duplex
Alfa linha
Resistência à corrosão.
Abstract in Portuguese
A fase alfa linha provoca uma diminuição brusca da resistência à corrosão e perda das propriedades mecânicas dos aços inoxidáveis dúplex. Neste trabalho realizaram-se ensaios mecânicos e eletroquímicos no aço inoxidável dúplex UR 52N+ envelhecido a 475ºC por vários tempos para avaliar a sensibilidade dos ensaios à presença de alfa linha. Os ensaios de dureza mostraram aumento gradual nos valores da mesma, já os ensaios de impacto revelaram que com 12h de envelhecimento o material já perde cerca de 80% da energia absorvida inicialmente pela amostra solubilizada. No entanto, os ensaios de polarização cíclica mostraram que mudanças significativas só são percebidas para tempos de envelhecimento superiores a 96h.
Title in English
Alpha prime effect on mechanical properties and corrosion resistance of UR 52N+ Duplex Stainless Steel
Keywords in English
475 oC
Aço inox duplex
alfa linha
Resistência à corrosão.
Abstract in English
Alpha prime phase leads to decreased corrosion resistance and mechanical properties losses of duplex stainless steels. In this work mechanical and electrochemical tests were performed in duplex stainless steel UR 52N+ aged at 475ºC for various periods in order to determine the sensibility of these tests to alpha prime presence. Hardness tests showed a gradual increase in its values; on the other hand, impact tests revealed that the material aged for 12h losses about 80% of energy absorption capacity of the solution annealed sample. Notwithstanding cyclic polarization tests showed that significant changes are only noted for aging times greater than 96h.
 
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Publishing Date
2009-11-27
 
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