Enhanced work-hardening behavior and mechanical properties in ultrafine-grained steels with large-fractioned metastable austenite

Shi, Jie; Sun, Xinjun; Wang, Maoqiu; Wang, Hui; Han, Dong; Cao, Wenquan

doi:10.1016/j.scriptamat.2010.06.023

Cited by 420 publications

(172 citation statements)

References 15 publications

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“…The results of dilatometric test ( Figure 7) and microstructural determination ( Table 3) both indicate that the bainite amount obviously increases with about 1% Cr addition. For bainitic steels, more bainite amount and RA fractions can improve mechanical properties [3,33,34]. In the present work, compared with steel A, the volume fractions of bainite and RA in steel B increase by 22.8% and 8%, respectively, resulting in an increment of 135 MPa in UTS and about 3% in TE.…”

Section: Influence Of Cr Additionmentioning

confidence: 50%

The Effects of Cr and Al Addition on Transformation and Properties in Low‐Carbon Bainitic Steels

Tian

Zhou

et al. 2017

Metals

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Three low-carbon bainitic steels were designed to investigate the effects of Cr and Al addition on bainitic transformation, microstructures, and properties by metallographic method and dilatometry. The results show that compared with the base steel without Cr and Al addition, only Cr addition is effective for improving the strength of low-carbon bainitic steel by increasing the amount of bainite. However, compared with the base steel, combined addition of Cr and Al has no significant effect on bainitic transformation and properties. In Cr-bearing steel, Al addition accelerates initial bainitic transformation, but meanwhile reduces the final amount of bainitic transformation due to the formation of a high-temperature transformation product such as ferrite. Consequently, the composite strengthening effect of Cr and Al addition is not effective compared with individual addition of Cr in low-carbon bainitic steels. Therefore, in contrast to high-carbon steels, bainitic transformation in Cr-bearing low-carbon bainitic steels can be finished in a short time, and Al should not be added because Al addition would result in lower mechanical properties.

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Section: Influence Of Cr Additionmentioning

confidence: 50%

The Effects of Cr and Al Addition on Transformation and Properties in Low‐Carbon Bainitic Steels

Tian

Zhou

et al. 2017

Metals

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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%

“…The TRIP steel used in the present study, with a nominal composition of 0.2 wt.% C and 5 wt.% Mn, was first melted in a high-frequency induction furnace under a vacuum and then cast into a 50 kg ingot (Shi et al, 2010a). The ingots were then homogenized at 1250°C for 2 h, and forged between 850°C and 1200°C into rods with diameters of 16 mm, finally cooled in the furnace to room temperature (RT).…”

Section: Methodsmentioning

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%

See 2 more Smart Citations

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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Microstructure Evolution and Mechanical Properties of Hot‐Rolled Medium Manganese TRIP Steels

Cai¹,

Ding²,

Xue³

et al. 2013

TMS2013 Supplemental Proceedings

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Enhanced work-hardening behavior and mechanical properties in ultrafine-grained steels with large-fractioned metastable austenite

Cited by 420 publications

References 15 publications

The Effects of Cr and Al Addition on Transformation and Properties in Low‐Carbon Bainitic Steels

The Effects of Cr and Al Addition on Transformation and Properties in Low‐Carbon Bainitic Steels

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

Microstructure Evolution and Mechanical Properties of Hot‐Rolled Medium Manganese TRIP Steels

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