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

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...

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Bibliographic Details
Published in:Materials research (São Carlos, São Paulo, Brazil) São Paulo, Brazil), 2012-01, Vol.15 (1), p.32-40
Main Authors: Lima, Milton Sergio Fernandes de, Santo, Ana Maria do Espirito
Format: Article
Language:English
Subjects:
Austenite
Bridgman
Bridgman method
Chromium
continuous cooling theory
Cooling
Crystal growth
directional solidification
ENGINEERING, CHEMICAL
laser remelting
Martensitic stainless steels
MATERIALS SCIENCE, MULTIDISCIPLINARY
METALLURGY & METALLURGICAL ENGINEERING
Phase transformations
Segregations
Transformation temperature
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Summary: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 mu m/s in directional growth experiments. Only plate-like austenite phase was observed in the experiments using growth rates above 100 mu m/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.
ISSN:1516-1439
1980-5373
1980-5373
DOI:10.1590/S1516-14392012005000003