EFEITO DO TEMPO ENTRE DEFORMAÇÕES NA INTERAÇÃO RECRISTALIZAÇÃO: PRECIPITAÇÃO DE UM AÇO INOXIDÁVEL AUSTENÍTICO COM ALTO TEOR DE NIÓBIO E NITROGÊNIO
[EN] EFFECT OF INTERPASS TIME ON RECRYSTALLIZATION: PRECIPITATION INTERACTION OF HIGH NIOBIUM AND NITROGEN AUSTENITIC STAINLESS STEEL
Silva, Mariana Beatriz dos Reis; Gallego, Juno; Marrero, José Maria Cabrera; Balancin, Oscar; Jorge Júnior, Alberto Moreira
http://dx.doi.org/10.4322/2176-1523.0877
Tecnol. Metal. Mater. Min., vol.12, n4, p.294-303, 2015
Resumo
Neste trabalho foi avaliada a influência do tempo entre passes de deformação na interação entre precipitação e recristalização durante o processamento termomecânico do aço ISO 5832-9. A evolução da microestrutura foi investigada por microscopia ótica, eletrônica de transmissão e EBSD. Observou-se que quanto menor o tempo entre passes de deformação, maiores foram as tensões necessárias para promover a deformação e menores os tamanhos dos grãos e precipitados obtidos. Após o encharque, somente precipitados de TiNbN foram encontrados, entretanto NbCrN (fase Ζ) e NbN precipitaram durante o processamento termomecânico. O material sofre recristalização dinâmica e partículas de 50 nm foram efetivas no ancoramento dos contornos de grãos e discordâncias.
Palavras-chave
Aço inoxidável, MET, Interação recristalização-precipitação, Nióbio.
Abstract
In this work it was investigated the influence of interpass time on recrystallization-precipitation interaction during thermomechanical processing of the ISO 5832-9 steel. The microstructure evolution was investigated by optical microscopy, transmission electron microscopy and EBSD. The results show that smaller the interpass time, higher is the stress level and smaller are the grain and precipitate sizes. After soaking, only TiNbN precipitates were found, whereas NbCrN (Ζ-phase) and NbN were formed during thermomechanical processing. The material dynamically recrystallizes and particles of 50 nm were effective in pinning grain boundaries and dislocations.
Keywords
Stainless steel, TEM, Interaction recrystallization-precipitation, Niobium.
Referências
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7 Morales EV, Gallego J, Kestenbach HJ. On coherent carbonitride precipitation in commercial microalloyed steels. Philosophical Magazine Letters. 2003;83(2):79-87. http://dx.doi.org/10.1080/0950083021000056632.
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10 Dutta B, Valdes E, Sellars M. Mechanism and kinetics of strain induced precipitation of Nb(C,N) in austenite. Acta Metallurgica et Materialia. 1992;40(4):653-662. http://dx.doi.org/10.1016/0956-7151(92)90006-Z.
11 Manohar PA, Ferry M, Chandra T. Five decades of the Zener equation. ISIJ International. 1998;38(9):913-924. http://dx.doi.org/10.2355/isijinternational.38.913.
2 Gladman T. Precipitation hardening in metals. Materials Science and Technology. 1999;15(1):30-36. http://dx.doi. org/10.1179/026708399773002782.
3 Abdollah-Zedeh A, Dunne DP. Effect of Nb on recrystallization after hot deformation in austenitic Fe-Ni-C. ISIJ International. 2003;43(8):1213-1218. http://dx.doi.org/10.2355/isijinternational.43.1213.
4 Vervynckt S, Verbeken K, Lopez B, Jonas JJ. Modern HSLA steels and role of non-recrystallization temperature. International Materials Reviews. 2012;57(4):187-207. http://dx.doi.org/10.1179/1743280411Y.0000000013.
5 Seher RJ, James HM, Maniar GN. Quantitative metallography of the age hardening precipitate in superalloys by replica electron microscopy. In: Proceedings of the 74th Sympsioum American Society for Testing and Materials; 1971 June 27-July 2; Atlanta City, USA. Easton: ASTM; 1971. p. 119-137.
6 Boratto F, Barbosa R, Yue S, Jonas JJ. Effect of chemical composition on the critical temperatures of microalloyed steels. In: Proceedings of the International Conference on Physical Metallurgy of Thermomechanical Processing of Steels and Other Metals, Thermec-88; 1988; Tokyo, Japan. Tokyo: ISIJ; 1988. p. 383-390.
7 Morales EV, Gallego J, Kestenbach HJ. On coherent carbonitride precipitation in commercial microalloyed steels. Philosophical Magazine Letters. 2003;83(2):79-87. http://dx.doi.org/10.1080/0950083021000056632.
8 Stadelmann P. Jems: java version V4, Japan. Lausanne: CIME; 2014 [acesso em 03 mar. 2015]. Disponível em: http://cimewww.epfl.ch/people/stadelmann/jemsWebSite/jems.html
9 FIZ Karlsruhe. Inorganic Crystal Structure Database - ICSD. Version 3.2.1 [página da internet]. Karlsruhe; 2015 [acesso em 03 mar. 2015]. Disponível em: http://www.fiz-karlsruhe.de/icsd.html
10 Dutta B, Valdes E, Sellars M. Mechanism and kinetics of strain induced precipitation of Nb(C,N) in austenite. Acta Metallurgica et Materialia. 1992;40(4):653-662. http://dx.doi.org/10.1016/0956-7151(92)90006-Z.
11 Manohar PA, Ferry M, Chandra T. Five decades of the Zener equation. ISIJ International. 1998;38(9):913-924. http://dx.doi.org/10.2355/isijinternational.38.913.
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