Acceleration of Low-temperature Bainite

García‐Mateo, C.; Caballero, Francisca G.; Bhadeshia, H. K. D. H.

doi:10.2355/isijinternational.43.1821

Cited by 460 publications

(348 citation statements)

References 6 publications

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“…An unconventional, carbide-free steel has recently been invented which on close examination is found to contain bainitic-ferrite plates as thin as 20 nm, separated by carbon-enriched films of retained austenite [4,[19][20][21][22][23]. This is the hardest ever bainite, which can be manufactured in bulk form, without the need for rapid heat treatment or mechanical processing.…”

Section: Nanostructured Bainitementioning

confidence: 99%

Properties of fine-grained steels generated by displacive transformation

Bhadeshia

2008

Materials Science and Engineering: A

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It has been possible in recent times to make large quantities of steels in which the controlling scale is 20 nm or less, i.e., comparable to that of carbon nanotubes. The mechanical properties of such steels are abnormal. For example, in some cases the ductility vanishes as the strength increases, whereas in others the ductility almost entirely consists of uniform plastic strain. Some of the steels also can tolerate large fractions of brittle phases before fracture. These and other aspects of strong, nanostructured steels are critically assessed to arrive at a hypothesis which rationalises the odd observations.

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Section: Nanostructured Bainitementioning

confidence: 99%

Properties of fine-grained steels generated by displacive transformation

Bhadeshia

2008

Materials Science and Engineering: A

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“…Thus, efforts were made to modify both the composition and processing schedules of this class of steels, especially with the introduction of deformation prior to isothermal heat treatment in order to accelerate the austenite to BF transformation. [24] Another approach to lower the alloying element content but maintain a good combination of strength and toughness is to consider, similarly to the standard TRIP steels, a multiphase steel with optimized stability of RA. It is well documented that the realization of the TRIP effect depends on a combination of various microstructural characteristics, such as (1) the volume fraction of the RA; (2) the morphology and size/thickness of the RA crystals; (3) the carbon content of the RA; (4) the location of the RA, if dealing with multiphase steel; and (5) the dislocation density of the BF.…”

mentioning

confidence: 99%

Understanding the Behavior of Advanced High-Strength Steels Using Atom Probe Tomography

Pereloma

Beladi

Zhang

et al. 2011

Metall Mater Trans A

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The key evidence for understanding the mechanical behavior of advanced high strength steels was provided by atom probe tomography (APT). Chemical overstabilization of retained austenite (RA) leading to the limited transformation-induced plasticity (TRIP) effect was deemed to be the main factor responsible for the low ductility of nanostructured bainitic steel. Appearance of the yield point on the stress-strain curve of prestrained and bake-hardened transformationinduced plasticity steel is due to the unlocking from weak carbon atmospheres of newly formed during prestraining dislocations.

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“…The thickness t of lath-shape phases was determined by measuring the mean linear intercept in a direction normal to the each set of plates 13 . All specimens for microstructure observations were ground and polished using standard techniques and etched in 4 vol% nital solution.…”

Section: Methodsmentioning

confidence: 99%

Novel method for refinement of retained austenite in micro/nano-structured bainitic steels

Wan

et al. 2017

Materials Science and Technology

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A comparative study was conducted to assess the effects of two different heat treatments on the amount and morphology of the retained austenite in a micro/nano-structured bainitic steel. The heat treatments used in this work were two-stage bainitic transformation and bainitic-partitioning transformation. Both methods resulted in the generation of a multi-phase microstructure containing nanoscale bainitic ferrite, and/or fresh martensitic phases and much finer retained austenite. Both heat treatments were verified to be effective in refining the retained austenite in micro/nano-structured bainite and increasing the hardness. However, the bainitic transformation followed by partitioning cycle was proved to be a more viable approach than the two-stage bainitic transformation due to much shorter processing time, i.e. ~2 hours compared to ~4 day, respectively.

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Acceleration of Low-temperature Bainite

Cited by 460 publications

References 6 publications

Properties of fine-grained steels generated by displacive transformation

Properties of fine-grained steels generated by displacive transformation

Understanding the Behavior of Advanced High-Strength Steels Using Atom Probe Tomography

Novel method for refinement of retained austenite in micro/nano-structured bainitic steels

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