A new strategy for developing a Nb microalloyed fire-resistant steel: Effects of boron and cooling rate
This study investigates the correlation among cooling rates, boron addition, and their subsequent effects on the microstructure and mechanical properties of niobium microalloyed steels, specifically with an intent to develop new fire-resistant steels. Slower cooling rates enhanced the ferrite transf...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-11-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424021549 |
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| author | A.M. Ferreira E.A. Ariza L.F. Bauri P.M.C.D. Gomes F.M.S.B. Carvalho M. Masoumi J.D. Poplawsky H. Goldenstein A.P. Tschiptschin |
| author_facet | A.M. Ferreira E.A. Ariza L.F. Bauri P.M.C.D. Gomes F.M.S.B. Carvalho M. Masoumi J.D. Poplawsky H. Goldenstein A.P. Tschiptschin |
| author_sort | A.M. Ferreira |
| collection | DOAJ |
| description | This study investigates the correlation among cooling rates, boron addition, and their subsequent effects on the microstructure and mechanical properties of niobium microalloyed steels, specifically with an intent to develop new fire-resistant steels. Slower cooling rates enhanced the ferrite transformation and (Nb,Ti)C precipitation, promoting a shift toward an equilibrium-phase microstructure. A boron addition of 30 ppm was sufficient to increase the fire resistance of niobium microalloyed steels when slowly cooled after thermocontrolled rolling. At rapid cooling rate boron induced the formation of upper bainite. Boron is mainly segregated at the interface of (Nb,Ti)C precipitates, possibly hindering the coarsening kinetics of nanosized carbides and contributing to the maintenance of a high yield strength during fire exposure simulations. The boron addition promoted a ratio between yield strength at 600 °C and room temperature greater than 66%., boron also shifted the strain-temperature curve to higher temperatures in transient tensile tests. These findings contribute to the potential use of boron additions in advancing cost-effective, high-performance, fire-resistant steel development, highlighting the central role of microstructural control and optimized thermomechanical treatment. |
| format | Article |
| id | doaj-art-fc874895a75a4ea081d0935db602316d |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-fc874895a75a4ea081d0935db602316d2024-12-26T08:53:52ZengElsevierJournal of Materials Research and Technology2238-78542024-11-013323652376A new strategy for developing a Nb microalloyed fire-resistant steel: Effects of boron and cooling rateA.M. Ferreira0E.A. Ariza1L.F. Bauri2P.M.C.D. Gomes3F.M.S.B. Carvalho4M. Masoumi5J.D. Poplawsky6H. Goldenstein7A.P. Tschiptschin8Universidade de São Paulo, Escola Politécnica, Departamento de Engenharia Metalúrgica e de Materiais, São Paulo, SP, BrazilUniversidade de São Paulo, Escola Politécnica, Departamento de Engenharia Metalúrgica e de Materiais, São Paulo, SP, Brazil; Universidad del Magdalena, Grupo de Nuevos Materiales, Santa Marta, Magdalena, ColombiaUniversidade de São Paulo, Escola Politécnica, Departamento de Engenharia Metalúrgica e de Materiais, São Paulo, SP, BrazilUniversidade de São Paulo, Escola Politécnica, Departamento de Engenharia Metalúrgica e de Materiais, São Paulo, SP, BrazilUniversidade de São Paulo, Escola Politécnica, Departamento de Engenharia Metalúrgica e de Materiais, São Paulo, SP, Brazil; Instituto de Pesquisas Tecnológicas (IPT), São Paulo, SP, BrazilUniversidade Federal do ABC, Centro de Engenharia, Modelagem e Ciências Sociais Aplicadas, Santo André, SP, BrazilCenter for Nanophase Materials Sciences, Oak Ridge National Laboratory, 37831, Oak Ridge, TN, USAUniversidade de São Paulo, Escola Politécnica, Departamento de Engenharia Metalúrgica e de Materiais, São Paulo, SP, BrazilUniversidade de São Paulo, Escola Politécnica, Departamento de Engenharia Metalúrgica e de Materiais, São Paulo, SP, Brazil; Corresponding author.This study investigates the correlation among cooling rates, boron addition, and their subsequent effects on the microstructure and mechanical properties of niobium microalloyed steels, specifically with an intent to develop new fire-resistant steels. Slower cooling rates enhanced the ferrite transformation and (Nb,Ti)C precipitation, promoting a shift toward an equilibrium-phase microstructure. A boron addition of 30 ppm was sufficient to increase the fire resistance of niobium microalloyed steels when slowly cooled after thermocontrolled rolling. At rapid cooling rate boron induced the formation of upper bainite. Boron is mainly segregated at the interface of (Nb,Ti)C precipitates, possibly hindering the coarsening kinetics of nanosized carbides and contributing to the maintenance of a high yield strength during fire exposure simulations. The boron addition promoted a ratio between yield strength at 600 °C and room temperature greater than 66%., boron also shifted the strain-temperature curve to higher temperatures in transient tensile tests. These findings contribute to the potential use of boron additions in advancing cost-effective, high-performance, fire-resistant steel development, highlighting the central role of microstructural control and optimized thermomechanical treatment.http://www.sciencedirect.com/science/article/pii/S2238785424021549Fire-resistant steelsNiobium microalloyed steelsFire simulation testsNanoprecipitates |
| spellingShingle | A.M. Ferreira E.A. Ariza L.F. Bauri P.M.C.D. Gomes F.M.S.B. Carvalho M. Masoumi J.D. Poplawsky H. Goldenstein A.P. Tschiptschin A new strategy for developing a Nb microalloyed fire-resistant steel: Effects of boron and cooling rate Journal of Materials Research and Technology Fire-resistant steels Niobium microalloyed steels Fire simulation tests Nanoprecipitates |
| title | A new strategy for developing a Nb microalloyed fire-resistant steel: Effects of boron and cooling rate |
| title_full | A new strategy for developing a Nb microalloyed fire-resistant steel: Effects of boron and cooling rate |
| title_fullStr | A new strategy for developing a Nb microalloyed fire-resistant steel: Effects of boron and cooling rate |
| title_full_unstemmed | A new strategy for developing a Nb microalloyed fire-resistant steel: Effects of boron and cooling rate |
| title_short | A new strategy for developing a Nb microalloyed fire-resistant steel: Effects of boron and cooling rate |
| title_sort | new strategy for developing a nb microalloyed fire resistant steel effects of boron and cooling rate |
| topic | Fire-resistant steels Niobium microalloyed steels Fire simulation tests Nanoprecipitates |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424021549 |
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