Tecnologia em Metalurgia, Materiais e Mineração
https://tecnologiammm.com.br/article/doi/10.4322/2176-1523.20202263
Tecnologia em Metalurgia, Materiais e Mineração
Artigo Original

STRATEGIES TO MODULATE THE INTERACTION OF NB WITH MICROSTRUCTURE DURING HOT ROLLING OF FLAT PRODUCTS

Beatriz Pereda, Beatriz Lopez, Jose Maria Rodriguez-Ibabe

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Resumo

Nb microalloying in thermomechanical processes for flat products has been related to its suitability to enhance strain-induced precipitation and obtain a pancaked austenite prior to transformation. As new steel grades or lay-outs are developed, more complex metallurgical conditions need to be evaluated. In this context, Nb microalloying needs to intervene in a more controlled way in all steps. For instance, the hardenability enhancement related to Nb to achieve lower temperature transformation products demands an adequate balance of Nb precipitated during rolling and the one remaining in solid solution. Similar effects are also sought if Nb is used to increase strength through precipitation hardening. This work evaluates how changes in the rolling strategies affect the interaction between Nb(C,N) precipitation and austenite recrystallization during hot rolling. As the interactions are complex, application of microstructural models helps to define the best austenite conditioning and the convenient amount of Nb in solution as a function of final applications. Several strategies are discussed for both normal and coarse initial austenite grain sizes.

Palavras-chave

Nb Microalloying; Thermomechanical Processing; Pancaked Austenite; Intragranular Nucleation

Referências

1 Isasti N, López B, Rodriguez-Ibabe JM, Martínez L, Hatui AK. Development of ferritic-bainitic Nb microalloyed steels by CSP route. In: Proceedings of International Symposium on Thin Slab Casting and Rolling (TSCR); 2018 Apr 25-27; Wuhan, China. China: Chinese Society for Metals; 2018. p. 80-87.

2 Linzer B, Jungbauer A, Wersching G, Viehböck A, Changjiang Y, Yao Y, et al. The new world of hot strip rolling: achievements at Rizhao steels’s new ESP complex setting new standards. Berg- und Hüttenmännische Monatshefte. 2016;161:421-428.

3 Pereda B, Lopez B, Rodriguez-Ibabe JM. Relevance of static and dynamic recrystallizations on austenite grain refinement in Nb-Mo microalloyed steels. Materials Science Forum. 2010;638-642:3350-3355.

4 Ceit. MicroSim-DSP software. Version. 9. San Sebastian, Spain; 2018.

5 Larzabal G, Garcia-Sesma L, Pereda B, Uranga P, Rebellato M, López B, et al. Validation of an indirect technique to quantify the amount of Nb in solution prior to hot rolling. In: Proceedings of the MS&T16; 2016 Nov 23-27; Salt Lake City, USA. Warrendale: AIST; 2016. p. 509-516.

6 Rodriguez-Ibabe JM, Uranga P, Lopez B. Some aspects regarding microstructural heterogeneities during steel processing. Materials Science Forum. 2012;706-709:157-164.

7 Stalheim D. Generation of stable optimized through-thickness mechanical properties in wide, heavy-gauge structural steel plate. In: AISTech 2018: Proceedings of the Iron & Steel Technology Conference; 2018, Philadelphia, PA. Warrendale: Association for Iron & Steel Technology; 2018. p. 2295-2307.


Submetido em:
13/12/2019

Aceito em:
17/12/2019

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