Nanoindentation investigation on the mechanical stability of individual austenite grains in a medium-Mn transformation-induced plasticity steel

He, Binbin; Huang, Mingxin; Liang, Z.Y.; Ngan, Ahw; Luo, Haiwen; Shi, Jie; Cao, Wenquan; Han, Dong

doi:10.1016/j.scriptamat.2013.03.030

Cited by 127 publications

(59 citation statements)

References 23 publications

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“…Intercritical annealing of Mn-bearing steel was demonstrated to be a method capable of fabricating an ultrafine-grained austenite-ferrite duplex steel by austenite-reverted transformation (ART-annealing) (Shi et al, 2010a;Luo et al, 2011;He et al, 2013). The ultrafine-grained austenite-ferrite duplex structure developed by ART annealing is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…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%

“…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. The focus will be on the high strain rate deformation and temperature rise effects on transformation behaviors and how they affect the evolution of strain localization and the overall mechanical performance.…”

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: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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“…4 MPa with a total elongation of 34% [4,5]. Studies relevant to medium Mn steel are mainly focused on (0.1-0.2)C(3-10)Mn (wt %) steels with a certain amount of austenite [6][7][8]. The final microstructure is usually controlled to be ferrite + austenite dual phases by inter-critical annealing between the start (A s ) and finish (A f ) temperatures of the reverse transformation after hot-rolling or cold-rolling, during which the ferrite or martensite transforms into austenite [2,9].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Tensile-Shear Properties of Resistance Spot-Welded Medium Mn Steel

Jia

Liu

Guo

et al. 2018

Metals

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Abstract:The medium Mn steels are gaining increasing attention due to their excellent combination of mechanical properties and material cost. A cold-rolled 0.1C5Mn medium Mn steel with a ferrite matrix plus metastable austenite duplex microstructure was resistance spot-welded with various welding currents and times. The nugget size rose with the increase of heat input, but when the welding current exceeded the critical value, the tensile-shear load increased slowly and became unstable due to metal expulsion. The fusion zone exhibited a lath martensite microstructure, and the heat-affected zone was composed of a ferrite/martensite matrix with retained austenite. The volume fraction of retained austenite decreased gradually from the base metal to the fusion zone, while the microhardness presented a reverse varying trend. Interfacial failure occurred along the interface of the steel sheets with lower loading capacity. Sufficient heat input along with serious expulsion brought about high stress concentration around the weld nugget, and the joint failed in partial interfacial mode. Pull-out failure was absent in this study.

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“…In other words, the precipitation behavior of specific nanoparticles can be significantly different in different matrix CONTACT C. T. Liu chainliu@cityu.edu.hk phases. Practically, for many high-strength steels, the matrix is tailored to have a mixture of two or more phases, rather than simply a single phase, to obtain an optimum combination of high strength and high ductility [11][12][13][14]. Among them, Cu and NiAl nanoparticle-strengthened steels represent an important class of advanced highstrength steels, which have attracted significant attention in recent years due to their good combination of high strength, good ductility, and good weldability [15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Atom-probe study of Cu and NiAl nanoscale precipitation and interfacial segregation in a nanoparticle-strengthened steel

Jiao

Luan

Guo

et al. 2017

Materials Research Letters

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The Cu and NiAl nanoscale precipitation and interfacial segregation in the martensite and austenite phases within a high-strength steel were studied by atom-probe tomography (APT). In the martensite phase, APT reveals the precipitation of isolated NiAl nanoparticles and NiAl/Cu co-precipitates, indicating that NiAl nanoparticles form first in the precipitation sequence. In comparison, the austenite phase contains only Cu nanoparticles with Ni segregation at the particle/matrix interface, in which the Ni segregation reduces the Cu nanoparticle interfacial energy. In addition, Mn and C exhibit an enrichment at the martensite/austenite interface, and the mechanism for the interfacial segregation was also discussed. IMPACT STATEMENTThe understanding of nanoscale precipitation and interfacial segregation mechanism provides the basis for the control of precipitate microstructures and mechanical properties of nanoparticlestrengthened steels. ARTICLE HISTORY

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Nanoindentation investigation on the mechanical stability of individual austenite grains in a medium-Mn transformation-induced plasticity steel

Cited by 127 publications

References 23 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

Microstructure and Tensile-Shear Properties of Resistance Spot-Welded Medium Mn Steel

Atom-probe study of Cu and NiAl nanoscale precipitation and interfacial segregation in a nanoparticle-strengthened steel

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