Microstructural examination of two experimental high-strength bainitic low-alloy steels containing silicon

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

doi:10.1179/026708387790329595

Cited by 27 publications

(27 citation statements)

References 10 publications

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“…These films have a typical wavy morphology characteristic of the bainite in high-silicon steels. 9,21) Despite the high carbon content in Steel 2 (0.79 mass%) and the quite large fraction of bainite present in its microstructure, austenite is not greatly enriched in carbon in this steel (Table 2). This is only possible if a substantial quantity of carbon is trapped in the bainitic ferrite as X-ray data in Table 2 confirm.…”

Section: Methodsmentioning

confidence: 94%

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Dilatometric Study of Reaustenitisation of High Silicon Bainitic Steels: Decomposition of Retained Austenite

Caballero¹,

García‐Mateo²,

Andrés³

2005

Mater. Trans.

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The formation of austenite during the heating of high-silicon steels with a microstructure of bainitic ferrite plates separated by carbonenriched regions of retained austenite has been studied. As the steel is heated, retained austenite decomposes into a mixture of ferrite and carbides before a temperature is reached where it becomes the more stable phase and hence can grow. The decomposition makes it necessary for the austenite to nucleate from the mixture of ferrite and carbides. In this work, dilatometric analysis, transmission electron microscopy and X-ray diffraction have helped to identify the processes that take place during the heating experiment.

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Section: Methodsmentioning

confidence: 94%

“…The alloy composition is chosen such that an initial microstructure of austenite and bainitic ferrite can easily be obtained; [7][8][9][10][11][12] steels of this kind have become extremely important in recent years, primarily because of their excellent combination of strength and toughness.…”

Section: Introductionmentioning

confidence: 99%

Dilatometric Study of Reaustenitisation of High Silicon Bainitic Steels: Decomposition of Retained Austenite

Caballero¹,

García‐Mateo²,

Andrés³

2005

Mater. Trans.

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“…As various processing schedules result in different microstructures, the focus of many research projects has been on increasing the volume fraction of the RA and its stability during straining [7,9,10]. Chemical (carbon content) and mechanical (size and morphology) stability of the RA are both important parameters that need to be controlled in order to achieve the desired strength-ductility balance in TRIP steels [7,[10][11][12][13][14]. In the present study, the correlation of the mechanical properties with the behaviour of the RA during tensile testing in thermo-mechanically processed TRIP steels is carried out.…”

Section: Introductionmentioning

confidence: 99%

Addressing Retained Austenite Stability in Advanced High Strength Steels

Pereloma

Gazder

Timokhina

2013

MSF

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Advances in the development of new high strength steels have resulted in microstructures containing significant volume fractions of retained austenite. The transformation of retained austenite to martensite upon straining contributes towards improving the ductility. However, in order to gain from the above beneficial effect, the volume fraction, size, morphology and distribution of the retained austenite need to be controlled. In this regard, it is well known that carbon concentration in the retained austenite is responsible for its chemical stability, whereas its size and morphology determines its mechanical stability. Thus, to achieve the required mechanical properties, control of the processing parameters affecting the microstructure development is essential. Abstract. Advances in the development of new high strength steels have resulted in microstructures containing significant volume fractions of retained austenite. The transformation of retained austenite to martensite upon straining contributes towards improving the ductility. However, in order to gain from the above beneficial effect, the volume fraction, size, morphology and distribution of the retained austenite need to be controlled. In this regard, it is well known that carbon concentration in the retained austenite is responsible for its chemical stability, whereas its size and morphology determines its mechanical stability. Thus, to achieve the required mechanical properties, control of the processing parameters affecting the microstructure development is essential.

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“…So, replacing the ferrite matrix with bainitic ferrite lath structure is expected to improve the stretch-flangeability of the TMP steel. Such a steel with the bainitic ferrite plus the retained austenite structure or "TRIP type bainitic (TB) steel" has been already developed as 0.2-0.6mass%C-Si-Mn [10][11][12][13][14] or C-SiNi [10][11][12] steels. Also, the characteristics of microstructure and the mechanical properties were reported by some research groups.…”

Section: Introductionmentioning

confidence: 99%

“…Also, the characteristics of microstructure and the mechanical properties were reported by some research groups. [9][10][11][12][13] However, there is no systematic research on the ductility and deformation mechanism of the TB steel from a viewpoint of improving the press formability.…”

Section: Introductionmentioning

confidence: 99%

Retained Austenite Characteristics and Tensile Properties in a TRIP Type Bainitic Sheet Steel.

et al. 2000

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Retained austenite characteristics and tensile properties in a 0.2C-1.5Si-1.5Mn, mass%, high-strength cold-rolled "TRIP type bainitic steel" which was associated with the transformation induced plasticity (TRIP) of the retained austenite were investigated. The steel mainly consisted of bainitic ferrite lath matrix, blocky martensites and stable retained austenite films of 5-12 vol%. When austempered at temperatures above M S temperature, the steel possessed high tensile strength of 900 MPa, large total elongation of 15-20 % and large reduction of area of 40-60 %. The good ductility was mainly owing to uniform fine lath structure, initial martensite and the TRIP effect of retained austenite, as well as a small contribution of long range internal stress resulting from untransformed retained austenite films.

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Microstructural examination of two experimental high-strength bainitic low-alloy steels containing silicon

Cited by 27 publications

References 10 publications

Dilatometric Study of Reaustenitisation of High Silicon Bainitic Steels: Decomposition of Retained Austenite

Dilatometric Study of Reaustenitisation of High Silicon Bainitic Steels: Decomposition of Retained Austenite

Addressing Retained Austenite Stability in Advanced High Strength Steels

Retained Austenite Characteristics and Tensile Properties in a TRIP Type Bainitic Sheet Steel.

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