ESTUDO DA PRECIPTAÇÃO EM AÇOS DE ALTA RESISTÊNCIA E BAIXA LIGA POR TERMODINÂMICA COMPUTACIONAL
STUDY OF PRECIPITATION HIGH STRENGTH LOW ALLOY STEEL BY COMPUTATIONAL THERMODYNAMIC
Lage, Meire Guimarães; Araújo, Carlos Salaroli de
http://dx.doi.org/10.4322/tmm.00701005
Tecnol. Metal. Mater. Min., vol.7, n1-2, p.24-283, 2010
Resumo
O presente trabalho teve como objetivo o estudo da precipitação em aços ARBL microligados ao Ti, Nb e V, visando dar subsídios ao desenvolvimento de projetos de liga e às etapas de processamento termomecânico. Para isso, foram realizados cálculos no programa computacional Thermo-Calc, versão 4, obtendo-se diagramas de equilíbrio, nos quais foram avaliadas a precipitação de compostos, as condições de solubilização de elementos na austenita e a influência dos elementos C, N, Nb e V sobre a precipitação. A metodologia de estudo forneceu informações qualitativas importantes sobre o fenômeno da precipitação, fundamentais para o estabelecimento de rotas de processamento termomecânico de aços ARBL.
Palavras-chave
Aço alta resistência, Aço baixa liga, Termodinâmica computacional, Precipitação
Abstract
The purpose of present work was to study the precipitation in Ti, Nb and V microalloyed HSLA steels, aimed to provide subsides for alloy design and thermomechanical processing. Calculations were performed using the Thermo-Calc software, version 4. The precipitation of compounds, the conditions for dissolution of elements in the austenite and the influence of the elements C, N, Nb and V on precipitation were evaluated using equilibrium diagrams. The methodology of the study provided important qualitative information about the phenomenon of precipitation, which are fundamental to establish routes of HSLA thermomechanical process.
Keywords
High strength steel, Low alloy steel, Computational thermodynamics, Precipitation
References
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7 HERMAN, J. C.; MESSIEN, P.; GRÉDAY, T. HSLA Ti – containing steels. In: INERNATIONAL CONFERENCE ON Thermomechanical Processing of Microallo yed Austenite, 1982, Pittsburgh. Proceedings… Warrendale, PA: Metallurgical Society if AIME, [s.d.]. p. 655-71.
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9 CHOI, J. K. Development of high strength and high performance steels at Posco Through HIPERS-21 Project. POSCO, Pohang, Korea.
10 XIONG, Y. et al. Study on high tensile heavy plate with V-N microalloying technology. In: International Seminar 2005 on Application Technologies of Vanadium in Flat – Rolled Steels, Beiijing. Suzhou. China: A Vanitec, 2005. p. 64-8.
11 SILVA, A. L. V. C.; AVILLEZ, R. R.; CORDEIRO, N. B. Modelos para a solubilidade de precipitados relevantes para a laminação a quente de aços. In: Congresso anual da ABM, 54., 1999, São Paulo. Anais… São Paulo: ABM, 1995. p. 457-67.
12 ZAJAC, S.; LAGNEBORG, R.; SIWECKI, T. The role of nitrogen in microalloyed steels. In: Microallo ying ’95 Conference, Pittsburgh. Proceedings… [S.l.]: Iron and Steel Society, 1995. p. 321-38.
2 KEOWN, S. R.; WILSON, W. G. Prediction of precipitate phases in microalloy steels containing niobium, carbon, nitrogen and aluminum. In: Thermomechanical Processing of Microallo yed Austenite, 1982, p. 343-59.
3 NAGAI, Y. et al. YS 500 Nmm2 High strength steel for offshore structures with good CTOD properties at welded joints. Nippon Steel Technical Report, n. 90, p. 14-9, July 2004.
4 ANDERSSON, J. O. et al. Thermo-Calc & Dictra: computational tools for materials science. Calphad, v. 26, n. 2, p. 273-312, jun. 2002.
5 PINDOR, L. et al. Investigation into secondary phases in steels microalloyed with vanadium and nitrogen. Ironmaking and Steelmaking, v. 35, n. 2, p. 124-8, Feb. 2008.
6 ADRIAN, H. Thermodynamic calculation of carbonitride precipitation as a guide for alloy design of microalloyed steels. In: Microallo ying ’95 Conference, Pittsburgh. Proceedings… [S.l.]: Iron and Steel Society, 1995. p. 285-305.
7 HERMAN, J. C.; MESSIEN, P.; GRÉDAY, T. HSLA Ti – containing steels. In: INERNATIONAL CONFERENCE ON Thermomechanical Processing of Microallo yed Austenite, 1982, Pittsburgh. Proceedings… Warrendale, PA: Metallurgical Society if AIME, [s.d.]. p. 655-71.
8 VERVYNCKT, S. et al. Austenite recrystallization-precipitation interaction in niobium microalloyed steels. ISIJ International, v. 49, n. 6, p. 911-20, Feb. 2009.
9 CHOI, J. K. Development of high strength and high performance steels at Posco Through HIPERS-21 Project. POSCO, Pohang, Korea.
10 XIONG, Y. et al. Study on high tensile heavy plate with V-N microalloying technology. In: International Seminar 2005 on Application Technologies of Vanadium in Flat – Rolled Steels, Beiijing. Suzhou. China: A Vanitec, 2005. p. 64-8.
11 SILVA, A. L. V. C.; AVILLEZ, R. R.; CORDEIRO, N. B. Modelos para a solubilidade de precipitados relevantes para a laminação a quente de aços. In: Congresso anual da ABM, 54., 1999, São Paulo. Anais… São Paulo: ABM, 1995. p. 457-67.
12 ZAJAC, S.; LAGNEBORG, R.; SIWECKI, T. The role of nitrogen in microalloyed steels. In: Microallo ying ’95 Conference, Pittsburgh. Proceedings… [S.l.]: Iron and Steel Society, 1995. p. 321-38.
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