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Influence of Nb Microaddition on Microstructure and Texture Evolution in a Fe-21Mn-1.3Al-1.5Si-0.5C TWIP Steel under Uniaxial Hot-Tensile Conditions

Published online by Cambridge University Press:  16 November 2017

A.E. Salas-Reyes ,
I. Mejía  and
J.M. Cabrera
A.E. Salas-Reyes
Affiliation:
Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, 58066-Morelia, Michoacán, México. E-mail: imejia@umich.mx, quique.salas@hotmail.com Departamento de Ingeniería Metalúrgica, Facultad de Química, Universidad Nacional Autónoma de México, Circuito Exterior s/n, Coyoacán, Cd. Universitaria, 04510-Ciudad de México, México.
I. Mejía*
Affiliation:
Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, 58066-Morelia, Michoacán, México. E-mail: imejia@umich.mx, quique.salas@hotmail.com
J.M. Cabrera
Affiliation:
Departament de Ciència dels Materials i Enginyeria Metal∙lúrgica, EEBE-Universitat Politècnica de Catalunya, c/Eduard Maristany 10-14, Edif. I, Of 1.18, 08019-Barcelona, Spain.
*
*(Email: i.mejia.granados@gmail.com)
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Abstract

Advanced high-strength steels as Twinning Induced Plasticity (TWIP) steels have been developed using microalloying elements and subsequent thermo-mechanical processing techniques. Moreover, under hot-working conditions, these steels undergo significant microstructural changes as a result of preferred crystallographic orientation (texture) of grains. In order to evaluate this behavior, one non-microalloyed and other single Nb-microalloyed TWIP steels were melted in an induction furnace and cast into metal and sand molds. Samples with austenitic grain sizes between 400 and 2000 µm were deformed at 800 °C and strained at a constant strain rate of 10-3 s-1, and deformation state was examined by means of electron backscatter diffraction (EBSD) technique near to the fracture tip. It was found that non-microalloyed TWIP steel solidified in both metal and sand mold exhibits dynamically recrystallized grains. On the other hand, Nb microaddition has a strong influence in TWIP steel retarding the onset of recrystallization kinetics, showing low angle sub-structured grains. Furthermore, it was possible identifying the crystallographic orientation of grains using the inverse pole figures (IPF) and the orientation distribution function (ODF). Weak cube {001}<100> recrystallization and E{111}<110> γ-fiber deformation textures components were detected.

Keywords

steeltexturestress/strain relationship
Type
Articles
Information
MRS Advances , Volume 2 , Issue 61: International Materials Research Congress XXV , 2017 , pp. 3797 - 3803
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Copyright
Copyright © Materials Research Society 2017 

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