Effect of niobium in the phase transformation and corrosion resistance of one austenitic-ferritic stainless steel
Austenitic-ferritic stainless steels containing 0.2% and 0.5% niobium were evaluated with respect to the microstructures, microhardness, pitting potential resistance, electrochemical impedance and wearing tests. Niobium is an alphagenic element and has a great influence on phase transformation of duplex stainless steels. In the present investigation, the samples were annealed at 1050 ºC and aged at 850 ºC to promote the formation of sigma phase. The pitting potential resistance and electrochemical impedance were evaluated in 3.5 % sodium chloride solution. The wear coefficients were calculated by micro-wear tests conducted using a fixed ball machine and aluminum oxide as abrasive. The results show that the niobium content lead to increase on Laves phase formation. This phase, in association with the sigma phase, causes a significant increase in the hardness and wear resistance with a decrease on corrosion resistance of the austenitic-ferritic stainless steels.
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2014
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oai:scielo:S1516-143920140004000012014-09-16Effect of niobium in the phase transformation and corrosion resistance of one austenitic-ferritic stainless steelItman Filho,AndréSilva,Rosana VilarimCardoso,Wandercleiton da SilvaCasteletti,Luiz Carlos duplex stainless steel containing niobium sigma phase Laves phase wear coefficient pitting potential charge transfer resistance Austenitic-ferritic stainless steels containing 0.2% and 0.5% niobium were evaluated with respect to the microstructures, microhardness, pitting potential resistance, electrochemical impedance and wearing tests. Niobium is an alphagenic element and has a great influence on phase transformation of duplex stainless steels. In the present investigation, the samples were annealed at 1050 ºC and aged at 850 ºC to promote the formation of sigma phase. The pitting potential resistance and electrochemical impedance were evaluated in 3.5 % sodium chloride solution. The wear coefficients were calculated by micro-wear tests conducted using a fixed ball machine and aluminum oxide as abrasive. The results show that the niobium content lead to increase on Laves phase formation. This phase, in association with the sigma phase, causes a significant increase in the hardness and wear resistance with a decrease on corrosion resistance of the austenitic-ferritic stainless steels.info:eu-repo/semantics/openAccessABM, ABC, ABPolMaterials Research v.17 n.4 20142014-08-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392014000400001en10.1590/1516-1439.190113 |
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Itman Filho,André Silva,Rosana Vilarim Cardoso,Wandercleiton da Silva Casteletti,Luiz Carlos |
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Itman Filho,André Silva,Rosana Vilarim Cardoso,Wandercleiton da Silva Casteletti,Luiz Carlos Effect of niobium in the phase transformation and corrosion resistance of one austenitic-ferritic stainless steel |
author_facet |
Itman Filho,André Silva,Rosana Vilarim Cardoso,Wandercleiton da Silva Casteletti,Luiz Carlos |
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Itman Filho,André |
title |
Effect of niobium in the phase transformation and corrosion resistance of one austenitic-ferritic stainless steel |
title_short |
Effect of niobium in the phase transformation and corrosion resistance of one austenitic-ferritic stainless steel |
title_full |
Effect of niobium in the phase transformation and corrosion resistance of one austenitic-ferritic stainless steel |
title_fullStr |
Effect of niobium in the phase transformation and corrosion resistance of one austenitic-ferritic stainless steel |
title_full_unstemmed |
Effect of niobium in the phase transformation and corrosion resistance of one austenitic-ferritic stainless steel |
title_sort |
effect of niobium in the phase transformation and corrosion resistance of one austenitic-ferritic stainless steel |
description |
Austenitic-ferritic stainless steels containing 0.2% and 0.5% niobium were evaluated with respect to the microstructures, microhardness, pitting potential resistance, electrochemical impedance and wearing tests. Niobium is an alphagenic element and has a great influence on phase transformation of duplex stainless steels. In the present investigation, the samples were annealed at 1050 ºC and aged at 850 ºC to promote the formation of sigma phase. The pitting potential resistance and electrochemical impedance were evaluated in 3.5 % sodium chloride solution. The wear coefficients were calculated by micro-wear tests conducted using a fixed ball machine and aluminum oxide as abrasive. The results show that the niobium content lead to increase on Laves phase formation. This phase, in association with the sigma phase, causes a significant increase in the hardness and wear resistance with a decrease on corrosion resistance of the austenitic-ferritic stainless steels. |
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ABM, ABC, ABPol |
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2014 |
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http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392014000400001 |
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AT itmanfilhoandre effectofniobiuminthephasetransformationandcorrosionresistanceofoneausteniticferriticstainlesssteel AT silvarosanavilarim effectofniobiuminthephasetransformationandcorrosionresistanceofoneausteniticferriticstainlesssteel AT cardosowandercleitondasilva effectofniobiuminthephasetransformationandcorrosionresistanceofoneausteniticferriticstainlesssteel AT castelettiluizcarlos effectofniobiuminthephasetransformationandcorrosionresistanceofoneausteniticferriticstainlesssteel |
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