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Erschienen in: Metallurgical and Materials Transactions A 9/2011

01.09.2011

Influence of Aluminum Alloying and Heating Rate on Austenite Formation in Low Carbon-Manganese Steels

verfasst von: D. San Martín, Y. Palizdar, C. García-Mateo, R. C. Cochrane, R. Brydson, A. J. Scott

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 9/2011

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Abstract

This investigation focuses on the austenite formation process during continuous heating, over a wide range of heating rates (0.05 to 20 K/s), in three low carbon-manganese steels alloyed with different levels of aluminum (0.02, 0.48, and 0.94, wt pct Al). High resolution dilatometry, combined with metallographic observations, was used to determine the starting (Ac 1) and finishing (Ac 3) temperatures of this transformation. It is shown that both the aluminum content and the applied heating rate have a strong influence on this process. During fast heating (>1 K/s), the pearlite phase present in the initial microstructure remains almost unaffected up to temperature Ac 1. On the contrary, during slow heating, cementite lamellas inside pearlite partially dissolve, this dissolution effect being more pronounced for the lower carbon and higher aluminum content steels. The changes in the initial microstructure during slow heating affect the austenite nucleation and growth processes. Furthermore, in the aluminum alloyed steels, slow heating conditions shift the Ac 3 temperature to higher values. This shift is suggested to be due to aluminum partitioning from austenite to ferrite, which stabilizes ferrite and delays its transformation to higher temperatures. Thermodynamic calculations carried out with MTDATA software seem to support some of the experimental observations carried out under very low heating conditions close to equilibrium (0.05 K/s).

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Metadaten
Titel
Influence of Aluminum Alloying and Heating Rate on Austenite Formation in Low Carbon-Manganese Steels
verfasst von
D. San Martín
Y. Palizdar
C. García-Mateo
R. C. Cochrane
R. Brydson
A. J. Scott
Publikationsdatum
01.09.2011
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 9/2011
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-011-0692-1

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