Transformation-induced plasticity for high strength formable steels

Jacques, Pascal

doi:10.1016/j.cossms.2004.09.006

Cited by 320 publications

(133 citation statements)

References 27 publications

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“…The latter category is of particular relevance because it represents cheap alloys, often referred to as the TRIP-assisted steels [12,13]. In these steels, the average carbon concentration is low ( 0.15 wt%) but the austenite becomes enriched with > 1 wt%C by the partitioning of carbon when other phases grow.…”

Section: Austenite and Enhanced Work-hardening Capacitymentioning

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: Austenite and Enhanced Work-hardening Capacitymentioning

confidence: 99%

Properties of fine-grained steels generated by displacive transformation

Bhadeshia

2008

Materials Science and Engineering: A

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“…10) Nonetheless, steels with 0.4 % Si and without Al have shown remarkable mechanical properties, 1) thanks to the combination of TRIP effect and a "composite" strengthening effect. 3,32,33) Several authors have concluded that full substitution of Si by an equivalent amount of Al would yield to a poorer strength ductility/balance; hence, they recommended the use of a mixed Al-Si TRIP-assisted multiphase steel. This type of steel would be an efficient compromise between the processing practice of these steels, the resulting mechanical properties and the industrial requirements.…”

Section: Introductionmentioning

confidence: 99%

Design of Composition in (Al/Si)-alloyed TRIP Steels

Gómez

García

Haezebrouck³

et al. 2009

ISIJ Int.

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Fig. 11. Comparison of the effect of the addition of (0.5-2 %) Mn, (0-1.5 %) Al, (0-1.5 %) Si to the steel presented in Table 2 on austenite volume fraction, austenite carbon content, carbon equivalent calculated with Eq. (1) and ideal diameter (DI) at 800°C; (a) effect of Mn-Al combinations with 0 % Si, (b) effect of Mn-Si combinations with 0 % Al, (c) effect of Si-Al combinations with 1.5 % Mn.

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“…The introduction of new types of steels in the automotive industry, such as transformation-induced-plasticity (TRIP) steels with metastable austenite and twinning-induced-plasticity (TWIP) steels with stable austenite, has been driven by the requirements to obtain high strength, high ductility and high energy absorption in meeting the demands for both lightweight and safety (Fischer et al, 2000;Jacques, 2004;Grässel et al, 2000;Frommeyer et al, 2003). A new type of TRIP steel with both high strength and excellent ductility has been developed by increasing the volume fraction of retained austenite and refining the grain size into the submicron region through intercritical annealing of 5 wt.% Mn steel (Miller, 1972;Niikura and Morris, 1980;Han et al, 2009;Shi et al, 2010a;Luo et al, 2011 phase during intercritical annealing, the strain-hardening behaviors and the mechanical stability of individual retained austenite grains of such 5Mn TRIP steels have been reported recently (Shi et al, 2010a;Luo et al, 2011;He et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Dynamic shear response and evolution mechanisms of adiabatic shear band in an ultrafine-grained austenite–ferrite duplex steel

Yuan

Bian

Jiang

et al. 2015

Mechanics of Materials

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a b s t r a c tThe dynamic properties of an intercritically annealed 0.2C5Mn steel with ultrafine-grained austenite-ferrite duplex structure were studied under dynamic shear loading. The formation and evolution mechanisms of adiabatic shear band in this steel were then investigated using interrupted experiments at five different shear displacements and the subsequent microstructure observations. The dynamic shear plastic deformation of the 0.2C5Mn steel was observed to have three stages: the strong linear hardening stage followed by the plateau stage, and then the strain softening stage associated with the evolution of adiabatic shear band. High impact shear toughness was found in this 0.2C5Mn steel, which is due to the following two aspects: the strong linear strain hardening by martensite transformation at the first stage, and the suppressing for the formation of shear band by the continuous deformation in different phases through the proper stress and strain partitioning at the plateau stage. The evolution of adiabatic shear band was found to be a two-stage process, namely an initiation stage followed by a thickening stage. The shear band consists of two regions at the thickening stage: a core region and two transition layers. When the adjoining matrix is localized into the transition layers, the grains are refined along with increasing fraction of austenite phase by inverse transformation. However, when the transition layers are transformed into the core region, the fraction of austenite phase is decreased and almost disappeared due to martensite transformation again. These interesting observations in the core region and the transition layers should be attributed to the competitions of the microstructure evolutions associated with the non-uniformly distributed shear deformation and the inhomogeneous adiabatic temperature rise in the different region of shear band. The 0.2C5Mn TRIP steel reported here can be considered as an excellent candidate for energy absorbers in the automotive industry.

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Transformation-induced plasticity for high strength formable steels

Cited by 320 publications

References 27 publications

Properties of fine-grained steels generated by displacive transformation

Properties of fine-grained steels generated by displacive transformation

Design of Composition in (Al/Si)-alloyed TRIP Steels

Dynamic shear response and evolution mechanisms of adiabatic shear band in an ultrafine-grained austenite–ferrite duplex steel

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