Fracture toughness of two experimental high-strength bainitic low-alloy steels containing silicon

Miihkinen, V. T. T.; Edmonds, David

doi:10.1179/026708387790329612

Cited by 21 publications

(16 citation statements)

References 9 publications

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“…6 compares the properties of the present alloys against published data, 25,26) highlighting the fact that novel bainitic steels exhibit an exceptional combination of mechanical properties that places this new type of microstructures in an advantageous position for different applications.…”

Section: Mechanical Propertiesmentioning

confidence: 75%

Ultra-high-strength Bainitic Steels

2005

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Novel bainitic microstructures, consisting of slender ferrite plates (tens of nm) in a matrix of retained austenite, have reported maximum yield strength of 1.4 GPa, ultimate tensile strength of 2.2 GPa, 30 % ductility and respectable levels of fracture toughness (ϳ51 MPa m0.5). The unusual combination of properties is attributed to the fine bainitic plates and the presence of retained austenite in the microstructure.

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Section: Mechanical Propertiesmentioning

confidence: 75%

Ultra-high-strength Bainitic Steels

2005

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“…Previous research, carried out by Bhadeshia and Edmonds 1,2) and Miihkinen and Edmonds, [3][4][5] on two siliconcontaining steels, nominally, Fe-0.2C-2Si-3Mn wt% and Fe-0.4C-2Si-4Ni wt%, showed that these alloys are promising. The Fe-0.2C-2Si-3Mn wt% alloy exhibited excellent fracture toughness (K Ic ϭ125 MPa ø m) in a yield strength range of 1 000-1 100 MPa as isothermally heat-treated between 350°C and 300°C.…”

Section: Introductionmentioning

confidence: 99%

Design of Advanced Bainitic Steels by Optimisation of TTT Diagrams and T0 Curves

et al. 2006

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Cementite is responsible of the limited application of conventional bainitic steels, however it has been proof that cementite precipitation during bainite formation can be suppressed by the judicious use of silicon in medium carbon steels. In this work, thermodynamic and kinetic models were used to design steels with an optimum bainitic microstructure consisting of a mixture of bainitic ferrite, carbon-enriched retained austenite and some martensite. Using these models, a set of seven carbide free bainitic steels with a 0.3 wt% carbon content were proposed for manufacturing. The work presented here is concerned with the microstructural and mechanical characterisation of the steels manufactured. Except for the steel with the highest content of alloying elements, all the grades present the same microstructure composed of carbidefree upper bainite and retained austenite after hot rolling and a two-steps cooling. Theirs tensile strengths range from 1 600 to 1 950 MPa while keeping a uniform elongation equal to 4 % and a total elongation over 10 %. Regarding toughness at room temperature, they match quenched and tempered martensitic steels.

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“…7) has higher inclination to destabilization, leading to relatively easier transformation to martensite. 14) Under such conditions, the austenite stability is reduced and, as a result, part of the retained austenite is transformed to martensite while cooling from tempering temperature. 4) Calculations, based on Eq.…”

Section: )mentioning

confidence: 99%