Adiabatic shear banding in ultrafine-grained Fe processed by severe plastic deformation

Wei, Q.; Kecskes, Laszlo J.; Jiao, Tifeng; Hartwig, K. T.; Ramesh, K.T.; Ma, E.

doi:10.1016/j.actamat.2003.12.025

Cited by 263 publications

(152 citation statements)

References 52 publications

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“…Moreover, most energy absorbers require materials that are (i) capable of keeping a high value of the stress upon dynamic deformation, and (ii) able to show a large value of strain at failure e f . The second requirement is strongly dependent on the onset of strain localization which triggers material failure (Meyer and Manwaring, 1986;Meyers et al, 1994;Subhash et al, 1997;Jia et al, 2003;Wei et al, 2004;Xue et al, 2005;Bronkhorst et al, 2006;Wei et al, 2006a,b;Mishra et al, 2008;Yang et al, 2011;Yuan et al, 2012;Zaera et al, 2014). So the purpose of this paper is to investigate the mechanical properties for the 5Mn TRIP steel with ultra-fined grains (Shi et al, 2010a;Luo et al, 2011;He et al, 2013) under dynamic shear loading at high strain rate.…”

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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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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“…Whether ASB occurs or not in a material under impact depends on the competation between work hardening and thermal softening. Since the ability of strain hardening is greatly reduced or vanished for most NC/UFG materials, the propensity of ASB within these materials would be enhanced (8)(9).…”

Section: Introductionmentioning

confidence: 99%

Mechanical behavior of ultrafine-grained materials under combined static and dynamic loadings

Guo

Sun

et al. 2015

EPJ Web of Conferences

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Abstract. Ultrafine-grained (UFG) materials have extensive prospects for engineering application due to their excellent mechanical properties. However, the grain size decrease reduces their strain hardening ability and makes UFG materials more susceptible to deformation instability such as shear localization. In most cases, critical shear strain is taken as the criterion for formation of shear localization under impact loading or adiabatic shear band (ASB). Recently, some researchers found that the formation of ASB was determined only by the dynamic loading process and had nothing to do with its static loading history. They proposed for coarse-grained metals a dynamic stored energy-based criterion for ASB and verified it by some experiments. In this study, we will focus on the shear localization behavior of UFG metals such as UFG titanium and magnesium alloy AZ31. Quasi-static loading and dynamic loading will be applied on the same specimen alternately. The shear localization behavior will be analyzed and the criterion of its formation will be evaluated.

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“…[12] Moreover, in contrast to deformed materials with micrometric grain sizes, deformed nanomaterials do not show the presence of dislocation, in particular, the characteristic dislocation tangles. [13,14] The strain rate sensitivity for nanocrystalline materials tested at low temperatures (ambient temperature) is small and usually does not exceed the value of 0.02.…”

Section: Introductionmentioning

confidence: 99%

Visco-Plastic Flow of Metal in Dynamic Conditions of Complex Strain Scheme

Korbel

Bochniak

Ostachowski

et al. 2011

Metall Mater Trans A

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The article applies to a piece of research inspired by the new technology of plastic metal forming called the KOBO method, which uses the mechanical and structural effects of cyclic changes of deformation path. Its commercial usage in the field of large plastic deformations, especially for the production of extruded elements made of hardly deformable metal alloys, naturally generated a question about the optimal conditions for carrying out the process and the criteria for their establishment, i.e., constitutive description. In this context, the work provides data on the force and energy consumption of aluminum and 7075 aluminum alloy extrusion processes, carried out using the KOBO method, and their dependence on the strain rate and temperature. The mechanism of deformation occurring during extrusion by the KOBO method was identified as visco-plastic flow. Characteristic parameters of the process, such as viscosity coefficiency, activation energy, activated volume, and the concentration of point defects generated during the process were evaluated.

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Adiabatic shear banding in ultrafine-grained Fe processed by severe plastic deformation

Cited by 263 publications

References 52 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

Mechanical behavior of ultrafine-grained materials under combined static and dynamic loadings

Visco-Plastic Flow of Metal in Dynamic Conditions of Complex Strain Scheme

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