Phase transformations in an AISI 410S stainless steel observed in directional and laser-induced cooling regimes

Phase transformations in an AISI 410S stainless steel observed in directional and laser-induced cooling regimes

Autor Lima, Milton Sergio Fernandes de Google Scholar
Espírito Santo, Ana Maria do Autor UNIFESP Google Scholar
Instituição Instituto de Estudos Avançados Centro Técnico Aeroespacial
Universidade Federal de São Paulo (UNIFESP)
Resumo The applications of the chromium ferritic stainless steel AISI 410S have been considerably increased in the last years in many technical fields as chemical industries and oil or gas transportation. However, the phase transformation temperatures are, currently, unknown for this alloy. The aim of this work is to determine the alpha to gamma transformation temperatures of the AISI 410S alloy in different cooling conditions and to analyze them using continuous cooling theory. In order to achieve different cooling rates and thermal conditions, two complementary techniques were used: Bridgman furnace crystal growth and laser remelting technique. The measured solidification temperature was around 1730 and 1750 K. Plate-like and dendritic austenite precipitates were obtained in solid-state phase using growth rates between 5 and 10 µm/s in directional growth experiments. Only plate-like austenite phase was observed in the experiments using growth rates above 100 µm/s. The appearance of dendrites, with the consequent segregation of the elements, can be previously determined by the microstructure modeling currently proposed. Massive austenite can be produced from 0.3 to 10 mm/s rates at temperatures between 1100-1300 K. The structure might be less sensitive to corrosion because this phase is produced without microsegregation.
Palavra-chave continuous cooling theory
directional solidification
Bridgman
laser remelting
Idioma Inglês
Financiador Commission of Technology and Innovation (Switzerland)
Swiss Steel Co.
Data de publicação 2012-02-01
Publicado em Materials Research. ABM, ABC, ABPol, v. 15, n. 1, p. 32-40, 2012.
ISSN 1516-1439 (Sherpa/Romeo, fator de impacto)
Publicador ABM, ABC, ABPol
Extensão 32-40
Fonte http://dx.doi.org/10.1590/S1516-14392012005000003
Direito de acesso Acesso aberto Open Access
Tipo Artigo
Web of Science WOS:000300791600006
SciELO S1516-14392012000100006 (estatísticas na SciELO)
Endereço permanente http://repositorio.unifesp.br/handle/11600/6951

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