EVOLUÇÃO MICROESTRUTURAL DE UM AÇO IF PRENSADO EM CANAIS EQUIANGULARES
MICROSTRUCTURAL EVOLUTION OF AN IF STEEL DEFORMED BY EQUAL CHANNEL ANGULAR PRESSING
Silva, Fabiane Roberta F. da; Lins, Jefferson Fabricio C.; Medeiros, Neil de; Moreira, Luciano Pessanha; Gouvêa, Jayme Pereira de
http://dx.doi.org/10.4322/tmm.00504001
Tecnol. Metal. Mater., vol.5, n4, p.193-197, 2009
Resumo
Um tarugo de aço IF foi deformado pela técnica de prensagem por canais equiangulares (Equal Channel Angular Pressing – ECAP) num único passe a temperatura ambiente. A partir da observação da sua microestrutura pode-se comprovar que houve um intenso refinamento dos grãos. Também foi observado que na sua microestrutura surgiram bandas de deformação regulares em função de processos de subdivisão dos grãos. O perfil de dureza na área deformada mostrou a existência de uma região de homogeneidade extensa em função da configuração do ferramental (raio de adoçamento) utilizado.
Palavras-chave
Prensagem, Aços IF, Deformação, Deformação plástica
Abstract
An IF steel billet was deformed via equal channel angular pressing (ECAP) using a single pass at room temperature. Grain refinement was observed in the microstructure after severe plastic deformation. Regular deformation bands arise in several grains as a result of grain fragmentation during the pressing. The hardness profile shows an extended homogeneity region within the deformed area due to the tooling (bend radius) employed.
Keywords
Pressing, IF steel, Deformation, Plastic deformation
Referências
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7 MEDEIROS, N.; LINS, J.F.C.; MOREIRA, L.P.; GOUVÊA, J.P. The role of the friction during the equal channel angular pressing of an IF-steel billet. Materials Science and Engineering A, v. 489, p. 363-72, Aug. 2008.
8 SILVA, F.R.F. Caracterização microestrutural e verificação experimental da simulação computacional das rotas A e C do processo ECAP para o aço IF. 2008. 72 f. Dissertação (Mestrado em Engenharia Metalúrgica) − Escola de Engenharia Industrial Metalúrgica de Volta Redonda da Universidade Federal Fluminense, Volta Redonda, 2009.
9 HANSEN, N., Deformation microstructures. Scripta Metallurgica et Materialia, v. 27, n. 11, p.1447-52, Dec. 1992.
10 KUHLMANN-WILSDORF, D. Overview No. 131 “Regular” deformation bands (DBs) and the LEDS hypothesis. Acta Materialia, v. 47, n. 6, p. 1697-712, Apr. 1999.
11 KREISLER, A.; DOHERTY, R.D. Structure of well defined deformation bands and formation of recrystallization nuclei in aluminium. Metal Science Journal, v. 12, p. 551-60, 1978.
12 BARNETT, M.R.; JONAS, J.J. Influence of ferrite rolling temperature on microstructure and texture in deformed low C and IF steels. ISIJ international, v. 37, n. 7, p. 697-705, 1997.
13 VANDERSCHUEREN, D.; YOSHINAGA, N.; KOYAMA, K. Recrystallization of Ti IF Steel Investigated with Electron Back-scattering Pattern (EBSP). ISIJ International, v. 36, n. 8, p. 1046-54, 1996.
14 PRELL, M.; XU, C.; LANGDON, T. G. The evolution of homogeneity on longitudinal sections during processing by ECAP. Materials Science and Engineering A, v. 480, p. 449-55, May 2008.
15 SHIN, D.H.; SEO, C.W.; KIM, J.; PARK, K.T.; CHOO, W.Y. The evolution of homogeneity on longitudinal sections during processing by ECAP. Scripta Materialia, v. 42, n. 7, p. 695-9, Nov. 1999.
2 SEGAL, V.M. Materials processing by simple shear. Materials Science and Engineering A, v. 197, n. 2, p.157-64, Jul. 1995.
3 HUMPHREYS, F.J.; HATHERLY, M. Recrystallization and related annealing phenomena. Oxford, U.K.: Pergamon, 1995.
4 HANSEN, N. Cold deformation microstructures. Material Science and Technology, v. 11, n. 6, p.1039-47, 1990.
5 LINS, J.F.C.; SANDIM, H.R.Z.; KESTENBACH, H.J. Microstructural and textural characterization of a hot-rolled IF steel. Journal of Materials Science, v. 42, n. 16, p. 6572-7, 2007.
6 MEDEIROS, N.; MOREIRA, L.P.; LINS, J.F.C.; SOUZA, M.C.; SILVA, F.R.F.; GOUVÊA, J.P. A numerical and experimental analysis of aluminium AA1100 deformed by different ECAP routes. In: CONGRESS OF MECHANICAL ENGINEERING (COBEM), 19., 2007, Brasília. Anais… Rio de Janeiro: ABCM, 2007. 1 CD, p. 1-8.
7 MEDEIROS, N.; LINS, J.F.C.; MOREIRA, L.P.; GOUVÊA, J.P. The role of the friction during the equal channel angular pressing of an IF-steel billet. Materials Science and Engineering A, v. 489, p. 363-72, Aug. 2008.
8 SILVA, F.R.F. Caracterização microestrutural e verificação experimental da simulação computacional das rotas A e C do processo ECAP para o aço IF. 2008. 72 f. Dissertação (Mestrado em Engenharia Metalúrgica) − Escola de Engenharia Industrial Metalúrgica de Volta Redonda da Universidade Federal Fluminense, Volta Redonda, 2009.
9 HANSEN, N., Deformation microstructures. Scripta Metallurgica et Materialia, v. 27, n. 11, p.1447-52, Dec. 1992.
10 KUHLMANN-WILSDORF, D. Overview No. 131 “Regular” deformation bands (DBs) and the LEDS hypothesis. Acta Materialia, v. 47, n. 6, p. 1697-712, Apr. 1999.
11 KREISLER, A.; DOHERTY, R.D. Structure of well defined deformation bands and formation of recrystallization nuclei in aluminium. Metal Science Journal, v. 12, p. 551-60, 1978.
12 BARNETT, M.R.; JONAS, J.J. Influence of ferrite rolling temperature on microstructure and texture in deformed low C and IF steels. ISIJ international, v. 37, n. 7, p. 697-705, 1997.
13 VANDERSCHUEREN, D.; YOSHINAGA, N.; KOYAMA, K. Recrystallization of Ti IF Steel Investigated with Electron Back-scattering Pattern (EBSP). ISIJ International, v. 36, n. 8, p. 1046-54, 1996.
14 PRELL, M.; XU, C.; LANGDON, T. G. The evolution of homogeneity on longitudinal sections during processing by ECAP. Materials Science and Engineering A, v. 480, p. 449-55, May 2008.
15 SHIN, D.H.; SEO, C.W.; KIM, J.; PARK, K.T.; CHOO, W.Y. The evolution of homogeneity on longitudinal sections during processing by ECAP. Scripta Materialia, v. 42, n. 7, p. 695-9, Nov. 1999.
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