Fatigue of extremely fine bainite

Abstract

There is a novel steel invented in which the structure consists of extremely fine platelets of bainitic ferrite dispersed in a matrix of carbon enriched retained austenite. The resulting large density of interfaces makes the alloy very strong in its transformed condition. The authors report the first fatigue tests on this system, by measuring the life of parallel gauged samples tested using cyclic loading in tension, with maximum stresses in the range 1?2-1?6 GPa. A comparison of the results against published data indicates that the performance of the steel is consistent with the behaviour of other strong steels, in spite of the fact that it is produced using an air melting technique.

Efeito Do Teor De Manganês Na Evolução Microestrutural E Na Cinética Da Transformação Bainítica Incompleta, Em Um Aço De Alto Carbono

“…Outro campo de aplicações é a fabricação de rodas para trens de carga e de alta velocidade para passageiros, bem como componentes que requerem resistência ao desgaste, como pistas de mancais de rolamentos, especialmente em condições de baixa lubrificação [8][9][10].…”

Developing very hard nanostructured bainitic steel

“…In the recent decade, Bhadeshia et al have developed and introduced high silicon, high carbon bainitic steels [1][2][3][4][5][6][7][8][9][10] with tensile strength and fracture toughness on the orders of 2.25 Gpa and 40 MPa m 0.5 respectively, without applying any mechanical treatment or rapid cooling [1][2][3][4][5][8][9][10][11][12]. They also attained impressive hardness of 600 -670 HV and the maximum at 690 HV100 which had never been reported for bainitic steels before [4].…”

Hydrogen Susceptibility of Nanostructured Bainitic Steels

“…[4][5][6][7] Nanostructured bainitic steels possess high strength imparted by the fine bainite plates in a matrix of retained austenite. [8][9][10][11][12][13] Isothermal transformation is the only viable method of producing such a nanostructure in bulk. [10,14,15] These novel nanostructures result from transformation at around 473 K to 523 K (200°C to 250°C), with a colossal supersaturation of carbon in the austenite and high supersaturation of carbon in ferrite.…”