Characterization of reverse martensitic transformation in cold-rolled austenitic 316 stainless steel
ABSTRACT In this work the reversion of the strain-induced ?’-martensite to ?’-austenite was studied in a series of AISI 316 stainless steels (SS) specimens. The samples were submitted to 63% reduction in thickness by rolling at a temperature of -70ºC, to achieve high martensite content. The reversion of martensite to austenite was made by means of isochronic, isothermal heat treatments at temperatures between 200 and 900ºC, so as to induce partial martensite-austenite phase transformation. The samples were studied by optical and electronic microscopy, X-ray diffraction, magnetization measurements, microhardness, and electromagnetic non destructive methods: feritscope, conductivity measurements using Van der Pauw’s technique, and magnetic permeability assessments by an eddy current inverse method. The metalography study showed an ?’ lath martensite type structure and a similar one for the reverted austenite (?’). Magnetization measurements and magnetic permeability showed that the reversion is active between 400 and 800°C. From the magnetic saturation measurements, a new calibration curve for the assessment of %?’ through the feritscope readings was obtained. The results of the different techniques were com-pared, in order to assess the scope of the studied techniques in the characterization of rolled SS products, and in the evaluation of progress of reversion reaction.
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Laboratório de Hidrogênio, Coppe - Universidade Federal do Rio de Janeiro
2018
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oai:scielo:S1517-707620180002005232018-07-19Characterization of reverse martensitic transformation in cold-rolled austenitic 316 stainless steelFava,JavierSpinosa,CristinaRuch,MartaCarabedo,FernandoLandau,MónicaCosarinsky,GuillermoSavin,AdrianaSteigmann,RozinaCraus,Mihail Liviu Martensite reversion austenitic eddy current. ABSTRACT In this work the reversion of the strain-induced ?’-martensite to ?’-austenite was studied in a series of AISI 316 stainless steels (SS) specimens. The samples were submitted to 63% reduction in thickness by rolling at a temperature of -70ºC, to achieve high martensite content. The reversion of martensite to austenite was made by means of isochronic, isothermal heat treatments at temperatures between 200 and 900ºC, so as to induce partial martensite-austenite phase transformation. The samples were studied by optical and electronic microscopy, X-ray diffraction, magnetization measurements, microhardness, and electromagnetic non destructive methods: feritscope, conductivity measurements using Van der Pauw’s technique, and magnetic permeability assessments by an eddy current inverse method. The metalography study showed an ?’ lath martensite type structure and a similar one for the reverted austenite (?’). Magnetization measurements and magnetic permeability showed that the reversion is active between 400 and 800°C. From the magnetic saturation measurements, a new calibration curve for the assessment of %?’ through the feritscope readings was obtained. The results of the different techniques were com-pared, in order to assess the scope of the studied techniques in the characterization of rolled SS products, and in the evaluation of progress of reversion reaction.info:eu-repo/semantics/openAccessLaboratório de Hidrogênio, Coppe - Universidade Federal do Rio de Janeiroem cooperação com a Associação Brasileira do Hidrogênio, ABH2Matéria (Rio de Janeiro) v.23 n.2 20182018-01-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1517-70762018000200523en10.1590/s1517-707620180002.04 |
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Fava,Javier Spinosa,Cristina Ruch,Marta Carabedo,Fernando Landau,Mónica Cosarinsky,Guillermo Savin,Adriana Steigmann,Rozina Craus,Mihail Liviu |
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Fava,Javier Spinosa,Cristina Ruch,Marta Carabedo,Fernando Landau,Mónica Cosarinsky,Guillermo Savin,Adriana Steigmann,Rozina Craus,Mihail Liviu Characterization of reverse martensitic transformation in cold-rolled austenitic 316 stainless steel |
author_facet |
Fava,Javier Spinosa,Cristina Ruch,Marta Carabedo,Fernando Landau,Mónica Cosarinsky,Guillermo Savin,Adriana Steigmann,Rozina Craus,Mihail Liviu |
author_sort |
Fava,Javier |
title |
Characterization of reverse martensitic transformation in cold-rolled austenitic 316 stainless steel |
title_short |
Characterization of reverse martensitic transformation in cold-rolled austenitic 316 stainless steel |
title_full |
Characterization of reverse martensitic transformation in cold-rolled austenitic 316 stainless steel |
title_fullStr |
Characterization of reverse martensitic transformation in cold-rolled austenitic 316 stainless steel |
title_full_unstemmed |
Characterization of reverse martensitic transformation in cold-rolled austenitic 316 stainless steel |
title_sort |
characterization of reverse martensitic transformation in cold-rolled austenitic 316 stainless steel |
description |
ABSTRACT In this work the reversion of the strain-induced ?’-martensite to ?’-austenite was studied in a series of AISI 316 stainless steels (SS) specimens. The samples were submitted to 63% reduction in thickness by rolling at a temperature of -70ºC, to achieve high martensite content. The reversion of martensite to austenite was made by means of isochronic, isothermal heat treatments at temperatures between 200 and 900ºC, so as to induce partial martensite-austenite phase transformation. The samples were studied by optical and electronic microscopy, X-ray diffraction, magnetization measurements, microhardness, and electromagnetic non destructive methods: feritscope, conductivity measurements using Van der Pauw’s technique, and magnetic permeability assessments by an eddy current inverse method. The metalography study showed an ?’ lath martensite type structure and a similar one for the reverted austenite (?’). Magnetization measurements and magnetic permeability showed that the reversion is active between 400 and 800°C. From the magnetic saturation measurements, a new calibration curve for the assessment of %?’ through the feritscope readings was obtained. The results of the different techniques were com-pared, in order to assess the scope of the studied techniques in the characterization of rolled SS products, and in the evaluation of progress of reversion reaction. |
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Laboratório de Hidrogênio, Coppe - Universidade Federal do Rio de Janeiro |
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2018 |
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http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1517-70762018000200523 |
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