Title

EFFECT OF GRAIN SIZE ON THE DRAWABILITY OF THE NIOBIUM-STABILIZED FERRITIC STAINLESS STEEL ASTM 430

EFFECT OF GRAIN SIZE ON THE DRAWABILITY OF THE NIOBIUM-STABILIZED FERRITIC STAINLESS STEEL ASTM 430

Authorship

Moura, Caio César Caldeira; Barbosa, Reginaldo Pinto; Oliveira, Tarcísio Reis de

Moura, Caio César Caldeira

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Barbosa, Reginaldo Pinto

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Oliveira, Tarcísio Reis de

I am this author

DOI

10.5151/2594-5297-32471

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Abstract

Studies were carried out with samples of 430 stainless steel stabilized with niobium produced by direct reduction (just one cold rolled process) in order to evaluate the influence of grain size on material drawability. Recrystallized samples were heat treated in the laboratory promoting the growth of the recrystallized grain. Microstructural characterizations were done by X-ray diffraction with emphasis on the evaluation of crystallographic texture, optical microscopy and EBSD. The drawability was evaluated through tensile tests for the determination the planar (Dr) and normal (r) anisotropy coefficients. The increase in grain size promoted an increase in the intensity of the gamma (beneficial) fiber and reduction theta (damaging) fiber on the surface of material thickness. At the center of thickness it was observed that the gamma fiber intensity did not change significantly and the theta fiber intensity was reduced. The change of the crystallographic texture, promoted by the increase of grain size, increased the coefficient of anisotropy (r) in all directions analyzed.

Studies were carried out with samples of 430 stainless steel stabilized with niobium produced by direct reduction (just one cold rolled process) in order to evaluate the influence of grain size on material drawability. Recrystallized samples were heat treated in the laboratory promoting the growth of the recrystallized grain. Microstructural characterizations were done by X-ray diffraction with emphasis on the evaluation of crystallographic texture, optical microscopy and EBSD. The drawability was evaluated through tensile tests for the determination the planar (Dr) and normal (r) anisotropy coefficients. The increase in grain size promoted an increase in the intensity of the gamma (beneficial) fiber and reduction theta (damaging) fiber on the surface of material thickness. At the center of thickness it was observed that the gamma fiber intensity did not change significantly and the theta fiber intensity was reduced. The change of the crystallographic texture, promoted by the increase of grain size, increased the coefficient of anisotropy (r) in all directions analyzed.

Keywords

anisotropy; texture; grain size; drawability;

anisotropy; texture; grain size; drawability;