Work

Creep-fatigue behavior analysis of the 310 NBN steel: Experimental and life prediction

Year: 2024

Type: article

Abstract: With the increasing challenge of extending the service life of structural steels components subjected to high-temperature environments, there is an urgent need to investigate the mechanisms of creep-fatigue and to develop new steels that can effectively withstand these complex loading regimes. This study examines the creep-fatigue behavior of a novel 310 NbN austenitic stainless steel , enhanced with nitrogen and niobium , under high-temperature conditions. Specimens were subjected to tests at 675 °C with varying hold-times of 0, 5, 60, and 600 s. Results indicated that longer hold times significantly increased crack growth rates and reduced cycles to fracture, highlighting a time-dependent crack propagation . Fracture surface analysis revealed a shift from transgranular to intergranular fracture with longer hold-times, indicating predominant creep damage. Predictive models, including the strip-yield model, aligned well with experimental data, emphasizing the critical role of hold-time in designing high-temperature steel components for improved durability.

Source: Journal of Materials Research and Technology

DOI: 10.1016/j.jmrt.2024.10.096

Authors: Julianna Magalhaes Garcia, Gabriel P. Potirniche, Robert Stephens, Sergio Neves Monteiro, Luiz Paulo Brandao

Institutions: Military Institute of Engineering, University of Idaho

Language: English

Topic: High Temperature Alloys and Creep

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,430

Funders: Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, Financiadora de Estudos e Projetos