Microstructure and Mechanical Properties of Nb-API X70 Low Carbon Steel
| Autor: | J. M. Giarola, W.W. Bose Filho, Gualter Silva Pereira, Julio Cesar Sousa Francisco, F. J. Pina, Fábio Faria Conde, J. A. Avila |
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| Přispěvatelé: | Universidade de São Paulo (USP), UTFPR, Universidade Estadual Paulista (UNESP), Universitat Politècnica de Catalunya. Departament de Resistència de Materials i Estructures a l'Enginyeria |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Pipelines
Toughness MATERIAIS Materials science Structural material Carbon steel Metals and Alloys Crack tip opening displacement Low-carbon Nb steel Mechanical properties engineering.material Fracture toughness Enginyeria dels materials [Àrees temàtiques de la UPC] Microstructure API X70 steel Steel High strength Ferrite (iron) Canonades Acer d'alta resistència engineering Pearlite Composite material |
| Zdroj: | Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| Popis: | Made available in DSpace on 2022-04-28T19:42:45Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-08-01 The oil and gas production has grown steadily, and the care with its transportation grid needs to be maintained and expanded. The pipeline used in the transport of gas and oil by-product requires materials with high mechanical strength, toughness, and fatigue resistance. The chemical composition and distribution, amount, and morphology of the final microconstituents of the steel are of paramount importance once it will directly influence the mechanical properties. The fracture toughness is one of the most important mechanical properties for the suitability of the steel for pipeline usage, and is most of the literature with pipelines study does not present tests such as crack tip opening displacement (CTOD), with a steady and controlled crack growth behavior, to evaluate its fracture toughness. This study compares the fracture toughness of the API 5L X70 steel between two plates of steel with different Nb content, 0.06 and 0.09 Nb wt.% by CTOD tests. The mechanical response was correlated to the grain size and distribution. The CTOD parameter was used to assess the fracture toughness at 25 °C and − 60 °C. The microstructures and microconstituents of the two plates of steel were similar. The matrices were composed of ferrite, with bands of secondary products, including degenerated pearlite. Results showed a prone to the formation of a bimodal microstructure, coarse and fine grains, due to the addition of Nb. High-Nb steel presented better fracture toughness than normal-Nb steel at low-temperature. USP – University of São Paulo, Av. Trabalhador São Carlense 400 Mechanical Engineering Department UTFPR UNESP – São Paulo State University, Campus of São João da Boa Vista, Av. Profª Isette Corrêa Fontão, 505, Jardim das Flores UNESP – São Paulo State University, Campus of São João da Boa Vista, Av. Profª Isette Corrêa Fontão, 505, Jardim das Flores |
| Databáze: | OpenAIRE |
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