Multiscale mechanics of TRIP-assisted multiphase steels: I. Characterization and mechanical testing

Jacques, Pascal; Furnémont, Quentin; Lani, Frédéric; Pardoen, Thomas; Delannay, Francis

doi:10.1016/j.actamat.2007.02.029

Cited by 309 publications

(178 citation statements)

References 27 publications

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“…This increasing fraction of martensite would lead to local strain re-distribution among different phases and inhibit the transformation behaviors, as suggested in previous study (Knijf et al, 2014). Previous research also suggested that the continuous deformation with proper strain and stress partitioning among different phases based on the law of mixture can still keep a hardening potential without transformation and retard the onset of strain localization (Kuang et al, 2009;Knijf et al, 2014;Bouquerel et al, 2006;Kang et al, 2007;Jacques et al, 2007;Lani et al, 2007;Han et al, 2014;Fillafer et al, 2014;Tasan et al, 2014). Of course, this hardening potential should be much weaker than the strong hardening induced by martensite transformation.…”

Section: Discussionmentioning

confidence: 92%

“…Somani et al (2009) and Huang et al (2011) reported that martensite transformation could be enhanced significantly by ultra-fined austenite grains in 301LN stainless steel, which was contrary to the common observations that smaller austenite grains are more stable against transformation (Iwamoto and Tsuta, 2000;Shi et al, 2010b). Other factors, such as strain rate, temperature and stress triaxiality, were also found to have strong influences on TRIP effect: (i) at the low strain rate range (<1/s), TRIP effect happens at earlier strain for higher strain rate, while the maximum volume fraction of martensite decreases with increasing strain rate (Das and Tarafder, 2009;Lee et al, 2014;Prüger et al, 2014;Zaera et al, 2014); (ii) TRIP effect is suppressed with increasing temperature at the low temperature range (77-332 K) (Prüger et al, 2014;Zaera et al, 2014;Lebedev and Kosarchuk, 2000); (iii) increasing stress triaxiality intensifies TRIP effect (Lebedev and Kosarchuk, 2000;Jacques et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 92%

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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“…Therefore, several studies were carried out to reveal the deformation behavior of retained austenite in TRIP steels [7][8][9]. Experimental investigations showed that the austenite stability is affected by: (i) the constraining effect from the phases surrounding the retained austenite [10], (ii) the crystallographic orientation of grains with respect to the loading direction [11], (iii) the local carbon concentration in the austenite [12] and (iv) the grain volume of the retained austenite grains [14].…”

Section: Introductionmentioning

confidence: 99%

Deformation-induced austenite grain rotation and transformation in TRIP-assisted steel

et al. 2012

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Uniaxial straining experiments were performed on a rolled and annealed Si-alloyed TRIP (transformation-induced plasticity) steel sheet in order to assess the role of its microstructure on the mechanical stability of austenite grains with respect to martensitic transformation. The transformation behavior of individual metastable austenite grains was studied both at the surface and inside the bulk of the material using electron back-scattered diffraction (EBSD) and X-ray diffraction (XRD) by deforming the samples to different strain levels up to about 20%. A comparison of XRD-and EBSD-results revealed that the retained austenite grains at the surface have a stronger tendency to transform than the austenite grains in the bulk of the material.The deformation-induced changes of individual austenite grains before and after straining were monitored with EBSD. Three different types of austenite grains can be distinguished that have different transformation behaviors: austenite grains at the grain boundaries between ferrite grains, twinned austenite grains, and embedded austenite grains that are completely surrounded by a single ferrite grain. It was found that twinned austenite grains and the austenite grains present at the grain boundaries between larger ferrite grains typically transform first, i.e. are less stable, in contrast to austenite grains that are completely embedded in a larger ferrite grain. In the latter case, straining leads to rotations of the harder austenite grain within the softer ferrite matrix before the austenite transforms into martensite. The analysis suggests that austenite grain rotation behavior is also a significant contributing factor for enhancement of the ductility.

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“…Isto era esperado, pois nestas condições supõe-se que a taxa de resfriamento foi menor, ou seja, o material ficou exposto por maior tempo à faixa de temperaturas de formação da bainita. Estes resultados estão de acordo com os encontrados por Zaefferer et al [40] e Jacques [41], onde maiores frações de bainita eram formadas em aços TRIP 800 com o aumento do tempo ou temperatura durante tratamento isotérmico.…”

Section: Resultsunclassified

Avaliação microestrutural e propriedades mecânicas de um aço TRIP soldado a ponto por fricção e mistura mecânica

et al. 2009

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Multiscale mechanics of TRIP-assisted multiphase steels: I. Characterization and mechanical testing

Cited by 309 publications

References 27 publications

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

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

Deformation-induced austenite grain rotation and transformation in TRIP-assisted steel

Avaliação microestrutural e propriedades mecânicas de um aço TRIP soldado a ponto por fricção e mistura mecânica

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