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Abstract
The present work shows a steel structure with bainitic ferrite dispersed on a matrix of carbon enriched retained austenite. The steel was produced using an air melting technique, and it was austempered at 200°C for 240 h. The steel presents tensile strength of ∼2 GPa. The authors report the new results of resistance to high cycle rotating fatigue in high strength bending life limit 107 cycles. A fatigue strength of 593 MPa was obtained, a result that is higher than that presented by important engineering materials such as forged steel and austempered ductile iron, even with the presence of fracture type ‘fish eye’, which nucleates mainly on shrinkage defects.
The authors are grateful to ‘Serviço Nacional de Aprendizagem Industrial – Centro Tecnológico de Fundição Marcelino Corradi (SENAI-CETEF)’ and to ‘Universidade Federal de Minas Gerais’ and to ‘Universidade de Itaúna’ for supporting this research. The authors are grateful for the financial support of CREA-MG and FAPEMIG.