Tecnologia em Metalurgia, Materiais e Mineração
https://tecnologiammm.com.br/article/doi/10.4322/2176-1523.20202217
Tecnologia em Metalurgia, Materiais e Mineração
Artigo Original

Effect of grain size on the drawability of the niobium-stabilized ferritic stainless steel ASTM 430

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

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Abstract

Studies were carried out with samples of AISI 430 stainless steel stabilized with niobium produced by direct reduction (just one cold rolling process) to evaluate the effects of grain size on the material deep drawability. Recrystallized samples were heat treated in laboratory to promote the growth of the recrystallized grain. Microstructural characterizations were done by X-ray diffraction for evaluating crystallographic texture, optical microscopy and electron backscatter diffraction (EBSD). The drawability was evaluated by tensile tests for determination of the planar (ΔR) and normal (r) anisotropy coefficients. An increase in the grain size promoted an increase in the intensity of the Gamma fiber (beneficial) and a reduction in the intensity of the Theta fiber (damaging) on the surface of the material’s thickness. At the centerline of the thickness, it was observed that the Gamma fiber’s intensity did not change significantly, and that the Theta fiber’s intensity was reduced. The change of the crystallographic texture, promoted by the increase of grain size, increased the coefficient of anisotropy (r) in all the analyzed directions and decreased the planar anisotropy coefficient.

Keywords

Anisotropy; Texture; Grain size; Deep drawability.

Referências

1 Oliveira TR, Alves HJ, Lopes RG, Guida RB. Influência da textura e da microestrutura na estampabilidade dos aços inoxidáveis ferríticos 430 estabilizados ao nióbio. In: Anais do 63º Congresso da Associação Brasileira de Materiais; 2008; Santos. São Paulo: ABM Brasil; 2008.

2 Oliveira TR. Effet du niobium et du titane sur la déformation à chaud d’aciers inoxydables ferritiques stabilisés [tese]. Saint-Étienne: Escole de Mines de Saint-Étienne; 2003.

3 Oliveira TR, Silva RC, Alcântara CM, Lopes RG, Ferreira JS, Arthuso EM, et al. Aço inoxidável ferrítico tipo ASTM 430 para estampagem profunda, com alto brilho e isento de estriamento. In: Anais do 68º Congresso Anual da Associação Brasileira de Materiais; 2013; São Paulo. São Paulo: ABM Brasil; 2013.

4 Yazawa Y, Osaki Y, Kato Y, Furukimi O. Development of ferritic stainless steel sheets with excellent deep drawability by {111} recrystallization texture control. JSAE Review. 2003;24(4):483-488.

5 Lee KM, Engler O, Huh MY. Effect of texture components on the Lankford parameters in ferritic stainless steel sheets. ISIJ International. 2011;53(3):522-529.

6 American Society for Testing and Materials. ASTM E112-13: standard tests methods for determining average grain size. West Conshohocken: ASTM; 2013.

7 American Society for Testing and Materials. ASTM E8/E8M-16a: standard test methods for tension testing of metallic materials. West Conshohocken: ASTM; 2016.

8 Jaskarin M, Jarvenpaa A, Karjalainen P. The effect of heating rate on texture and formability of Ti-Nb stabilized ferritic stainless steel. Key Engineering Materials. 2018;786:3-9.

9 Padilha A, Siciliano F. Encruamento, rescristalização, crescimento de grão e textura. 3. ed. São Paulo: Associação Brasileira de Materiais; 2005.

10 Raabe D, Lucke K. Selective particle drag during primary recrystallization of Fe-Cr alloys. Scripta Metallurgica et Materialia. 1992;26(1):19-24.

11 Tanure L, Alcantara M, Oliveira T, Santos D, Gonzalez B. Microstructure, texture and microhardness evolution during annealing heat treatment and mechanical behavior of the niobium-stabilized ferritic stainless steel ASTM 430 and noibium-titanium-stabilized ferritic stainless steel ASTM 439: a comparative study. Materials Research. 2017;20(6):1650-1657.

12 Abreu HF, Bruno AD, Tavares SS, Santos RP, Carvalho SS. Effect of High temperature annealing on texture and microstructure on an AISI-444 ferritic stainless steel. Materials Characterization. 2006;57(4-5):342-347.


Submetido em:
15/10/2019

Aceito em:
09/06/2020

5fcf70c40e882534434ac228 tmm Articles
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