Microstructure and Continuous Cooling Transformation of an Fe-7.1Al-0.7Mn-0.4C-0.3Nb Alloy

Reducing pollutant emissions and improving safety standards are primary targets for modern mobility improvement. To meet these needs, the development of low-density steels containing aluminum is a new frontier of research for automotive applications. Low-density Fe-Mn-Al-C alloys are promising. In t...

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Published in:Metals (Basel ) 2022-08, Vol.12 (8), p.1305
Main Authors: Gurgel, Mônica Aline Magalhães, de Souza Baêta Júnior, Eustáquio, da Silva Teixeira, Rodolfo, do Nascimento, Gabriel Onofre, Oliveira, Suzane Sant’Ana, Ferronatto Leite, Duílio Norberto, Moreira, Luciano Pessanha, Brandao, Luiz Paulo, dos Santos Paula, Andersan
Format: Article
Language:English
Subjects:
Alloys
Aluminum
Carbides
Cooling
Cooling rate
Delta ferrite
Dilatometry
Fe-Mn-Al-C steels
Hot rolling
Iron
Iron compounds
k-carbide
Low density materials
low-density steels
Manganese base alloys
Martensite
Mechanical properties
Microscopy
microstructural analysis
Microstructure
Morphology
Niobium carbide
phase transformation
Phase transitions
Pollutants
Retained austenite
Sensors
Steel industry
Steel, Structural
Temperature
Thermal properties
Thermal simulators
Weight reduction
δ-ferrite
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Summary:Reducing pollutant emissions and improving safety standards are primary targets for modern mobility improvement. To meet these needs, the development of low-density steels containing aluminum is a new frontier of research for automotive applications. Low-density Fe-Mn-Al-C alloys are promising. In this regard, an alloy with high aluminum content and niobium addition belonging to the Fe-Mn-Al-C system was evaluated to understand the possible phase transformations and thus obtain a transformation diagram by continuous cooling to help future processing. Dilatometry tests were performed in a Gleeble thermomechanical simulator with different cooling rates (1, 3, 5, 10, 15, 20, 30, and 50 °C/s). Chemical analyses carried out simultaneously with dilatometry tests showed the presence of proeutectoid ferrite (αp), δ-ferrite, retained austenite, and niobium carbide (NbC). In the case of low cooling rates (1 and 3 °C/s), lamellar colonies of the eutectoid microconstituents were observed with a combination of α-ferrite and k-carbide. For higher cooling rates (5 to 50 °C/s), martensite was observed with body-centered cubic (BCC) and body-centered tetragonal (BCT) structures.
ISSN:2075-4701
2075-4701
DOI:10.3390/met12081305