Effect of rolling speed on the occurrence of strain aging during and after warm rolling of a low-carbon steel

An integrated model based on finite-element method has been proposed to examine the mechanical and thermal responses of strips and work-rolls in tandem and reverse cold rolling operations. The model has been developed such that the influence of various process parameters, such as lubrication, rolling speed, frictional state and back-up rolls, can be examined. Thermal behaviors of the rolled material and the work-rolls have been analyzed using stream-line upwind Petrov–Galerkin approach, in order to make the model applicable to high-speed rolling processes, as well. The results have been compared to the actual on-line measurements and shown to be of acceptable accuracy. Such modeling approach can be considered as a useful means, providing a detailed insight on the thermo-mechanical response of strips, as well as work-rolls, during high-speed cold rolling of steel strips. Additionally, special attention has been drawn towards the prediction of the occurrence of the metallurgical phenomenon dynamic strain aging based on the results obtained from the numerical modeling in this work.

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“…24 Examples on the typical stress–strain curves obtained for DSA and non-DSA regions of this material can be found elsewhere. 44…”

Section: Resultsmentioning

confidence: 99%

Finite-element modeling of thermal aspects in high speed cold strip rolling

Koohbor

Moaven²

2015

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…Entretanto, para os ensaios realizados a 300°C, observou-se diminuição tanto do alongamento total quanto da redução de área em relação à condição de temperatura ambiente. Uma hipótese para explicar esse comportamento é a ocorrência do fenômeno de envelhecimento dinâmico no aço 410D nessa temperatura [16,17].…”

Section: Ensaios De Traçãounclassified

“…Esse fenômeno tem sido largamente estudado por diversos autores, pois assim como observado para o aço 410D, ele é responsável por significativas alterações de comportamento mecânico. Entre elas, pode-se citar a diminuição da capacidade de deformação plástica que não pode ser desconsiderada ao se avaliar aplicações do material em temperaturas elevadas [9,[16][17][18][19][20]. O efeito Portervin Le Chatelier se caracteriza por uma deformação descontínua que se traduz por serrilhados na região de deformação plástica uniforme da curva tensão-deformação, cuja amplitude e frequência variam com a composição química do metal e as condições experimentais [9,16].…”

Section: Ensaios De Traçãounclassified

Influência da temperatura sobre o comportamento mecânico do aço inoxidável ferrítico ASTM A240 UNS S41003

Arruda¹,

Carvalho²,

Queiroz³

et al. 2021

Tecnol. Metal. Mater. Min.

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Publicado pela ABM. Este é um artigo publicado em acesso aberto (Open Access) sob a licença Creative Commons Attribution, que permite uso, distribuição e reprodução em qualquer meio, sem restrições desde que o trabalho original seja corretamente citado. a ResumoO aço inoxidável do tipo ASTM A240 UNS S41003 é comumente denominado no Brasil como 410D e no mundo como 12%Cr. A sua composição química relativamente simples tem feito dele uma alternativa economicamente viável para setores da indústria brasileira que antes utilizavam apenas produtos fabricados a partir de aço carbono. Nesse contexto, e considerando que existem poucos trabalhos disponíveis na literatura que tenham caracterizado o desempenho mecânico desse aço em condições que simulem diferentes cenários de aplicação, o presente estudo avaliou o efeito da temperatura sobre o comportamento em tração, impacto e fluência (Sag Test) do aço inoxidável ferrítico 410D. Dados inéditos, de grande utilidade para a avaliação do referido aço como alternativa para potenciais aplicações que sejam pretendidas, são apresentados nesse estudo.

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“…Warm rolling process has recently been considered as an efficient means to produce flat steel products due to its considerable cost savings as well as desired product properties. 19–22 One of the significant aspects in the analysis of this metal forming process is that both mechanical and thermal loadings control the deformation behavior of work-rolls; thus, the use of a coupled thermal–mechanical investigation seems interesting in the study of this particular industrial process. Owing to the importance of warm rolling operations in industry and the fact that very few investigations have been dedicated to the study of the thermo-mechanical behavior of rolling mills in this process, 23 the present work was conducted with the purpose of examining the thermal and mechanical behaviors of work-rolls in warm strip rolling.…”

Section: Introductionmentioning

confidence: 99%

Finite element modeling of thermal and mechanical stresses in work-rolls of warm strip rolling process

Koohbor

2015

Proceedings of the Institution of Mechanical Engineers, Part B:

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An integrated mathematical model was developed to study the thermo-mechanical behavior of strips and work-rolls during warm rolling process of steels. A two-dimensional finite element analysis was first employed to solve for the thermomechanical response of the rolled strip under steady-state conditions. The calculated roll pressure and temperature fields were then used to apply proper boundary conditions for solving the governing thermo-mechanical problem for the work-roll. The obtained results indicate that in warm strip rolling of steels, the thermal and mechanical stresses developed within the work-roll are comparable; however, the more significant influence is due to heating and cooling of the work-roll during the process, particularly in case of warm rolling operations of the strips with higher initial temperature. Besides, the utilized model was shown to be capable of determining the effects of various rolling parameters on the thermo-mechanical behavior of strips and work-rolls during warm rolling process.

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Effect of rolling speed on the occurrence of strain aging during and after warm rolling of a low-carbon steel

Cited by 8 publications

References 12 publications

Finite-element modeling of thermal aspects in high speed cold strip rolling

Finite-element modeling of thermal aspects in high speed cold strip rolling

Influência da temperatura sobre o comportamento mecânico do aço inoxidável ferrítico ASTM A240 UNS S41003

Finite element modeling of thermal and mechanical stresses in work-rolls of warm strip rolling process

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