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      Effects of Heat Input and Niobium Addition on HAZ of Microalloyed Steels for Reinforcing Bars Translated title: Influência do Aporte Térmico e da Adição de Nióbio na ZTA de Aços Microligados para Aplicação Estrutural

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          Abstract

          Abstract: Niobium or vanadium addition provides homogeneous microstructures formation, strengthening and toughness improvement in steels. However, alloying elements increase can negatively affect Pcm (material parameter) value, which can lead to deleterious effects under welding conditions. Thus, welding trials were carried out on a novel microalloyed steel with 0.2%C by autogenous GTAW (Gas-Shielded Tungsten Arc Welding) process. The results indicate that coarse grains region of heat affected zone (CGHAZ) is the most critical area. This was due abnormal grains size (>100µm), achieving more than 4 times the average size of base metal (BM) grains, or the presence of high hardness microstructures. In addition, the results do not indicate softness in any region of HAZ, proving to be an advantage of these materials.

          Translated abstract

          Resumo: A adição de nióbio ou vanádio favorece a formação de microestruturas homogêneas, aumenta a resistência mecânica e a tenacidade dos aços. No entanto, a adição desses elementos de liga pode afetar negativamente o valor do Pcm (material parameter) o que pode levar a efeitos deletérios sob certas condições de soldagem. Dessa maneira, foram realizados testes em barras de um novo tipo de aço microligado com 0,2%C, pelo processo GTAW (Gas-shielded Tungsten Arc Welding). Os resultados indicam a região de grãos grosseiros da ZTA como sendo o local de maior criticidade durante a soldagem. Isso devido à presença de grãos com crescimento anormal (>100 µm), alcançando uma média superior a 4 vezes a do metal base, ou a presença de microestruturas de alta dureza. Em contrapartida, os resultados não indicam a redução de dureza em nenhuma região da ZTA, mostrando uma vantagem desses materiais.

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          Most cited references6

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          Classification and quantification of microstructures in steels

          G. Thewlis (2013)
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            Strength and Ductility of Damaged Tempcore Rebars

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              Is Open Access

              Effect of Nb and Ti addition on activation energy for austenite hot deformation

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                Author and article information

                Journal
                si
                Soldagem & Inspeção
                Soldag. insp.
                Associação Brasileira de Soldagem (São Paulo, SP, Brazil )
                0104-9224
                1980-6973
                2020
                : 25
                : e2531
                Affiliations
                [01] Belo Horizonte Minas Gerais orgnameCentro Federal de Educação Tecnológica de Minas Gerais orgdiv1Departamento de Engenharia de Materiais Brazil
                Article
                S0104-92242020000100222 S0104-9224(20)02500000222
                10.1590/0104-9224/si25.31
                e88fc12a-1efe-4a86-8310-9b24b7356517

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 20 May 2020
                : 07 August 2020
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 21, Pages: 0
                Product

                SciELO Brazil

                Categories
                Technical Papers

                Microalloyed steels,Welding,HAZ,Heat input,Soldagem,Aços microligados,ZTA,Aporte térmico

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