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High Ductility and Toughness of a Micro-duplex Medium-Mn Steel in a Large Temperature Range from—196 ℃ to 200 ℃

Journal of Iron and Steel Research International 2015年第12期22卷 1126-1130页

作者： Si-lian CHEN Jun HU Xiao-dan ZHANG Han DONG Wen-quan CAO Central Iron and Steel Research Institute School of Materials Science and Engineering Huazhong University of Science and Technology Danish-Chinese Centre for Nanometals Section for Materials Science and Advanced CharacterizationDepartment of Wind EnergyTechnical University of Denmark

A medium-Mn steel （0.2C5Mn） was processed by intercritical annealing at different temperatures （625 ℃ and 650 ℃ ）. An ultrafine-grained micro-duplex structure consisting of alternating austenite and ferrite laths was de- veloped by austenite reverse transformation （ART） during intercritical annealing after forging and hot rolling. Ultra- high ductility with a total elongation higher than 30% was achieved in the temperature range from -196 ℃ to 200 ℃, and high impact toughness no less than 200 J at -40 ℃ was obtained. Based on the analysis of microstructure and mechanical properties, it was found that the enhanced ductility was determined by the phase transformation effect of austenite （TRIP effect）, while the delayed ductile to brittle transition was controlled by austenite stability.

关键词： high strength high ductility intercritical annealing medium-Mn steel ultrafine grain size

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Effect of second phase particles on the tensile instability of a nanostructured Al-1%Si alloy

Effect of second phase particles on the tensile instability ...

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8th International Conference on Processing and Manufacturing of advanced materials, THERMEC 2013

作者： Huang, Tian Lin Wu, Gui Lin Liu, Qing Huang, Xiao Xu College of Materials Science and Engineering Chongqing University Chongqing 400045 China Danish-Chinese Center for Nanometals Section for Materials Science and Advanced Characterization Department of Wind Energy Technical University of Denmark Risø Campus DK-4000 Roskilde Denmark

ISBN: (纸本)9783038350736

A nanostructured Al-1%Si alloy containing dispersed Si particles was produced by heavily cold-rolling to study the effect of second phase particles on the tensile instability of nanostructured metals. Tensile tests were conducted on the as-deformed sample and the samples after recovery annealing treatments. The structural features of deformed and annealed samples were characterized by transmission electron microscopy. By comparing with the behavior of nanostructured commercial purity Al without dispersed particles, a remarked improvement in the tensile stability was found. This is related to a prevention of localized deformation by the presence of finely dispersed Si particles in the nanoscale matrix structure. © (2014) Trans Tech Publications, Switzerland.

关键词： Silicon alloys

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Boundary migration during recrystallization: experimental observations

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IOP Conference Series: materials science and Engineering 2015年第1期89卷

作者： Y B Zhang D Juul Jensen Section for Materials Science and Advanced Characterization Department of Wind Energy Technical University of Denmark Risø Campus Roskilde 4000 Denmark

Quantitative analysis of boundary migration during recrystallization is a key task to understand the recrystallization process and to improve recrystallization models. In the last 25-30 years, quantification of boundary migration has mostly been conducted in term of average growth rates in many materials. This type of analysis has largely been based on the assumption that all or groups of recrystallizing grains grow in the same uniform manner, therefore the results represent average growth behaviors on a macro scale. Recently, significant efforts have been made to quantify the boundary migration during recrystallization on local grain scales, using different advanced experimental characterization and computer simulation techniques. This paper aims at summarizing these recent achievements with focus on the potentials of the various advanced experimental characterization techniques. Suggestions for new experimental and simulation work important for advancing the current understanding of local boundary migration are finally discussed.

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Recrystallization texture in nickel heavily deformed by accumulative roll bonding

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IOP Conference Series: materials science and Engineering 2017年第1期219卷

作者： O V Mishin Y B Zhang A Godfrey Section for Materials Science and Advanced Characterization Department of Wind Energy Technical University of Denmark Risø Campus 4000 Roskilde Denmark Key Laboratory of Advanced Materials (MOE) School of Materials Science and Engineering Tsinghua University Beijing 100084 China

The recrystallization behavior of Ni processed by accumulative roll bonding to a total accumulated von Mises strain of 4.8 has been examined, and analyzed with respect to heterogeneity in the deformation microstructure. The regions near the bonding interface are found to be more refined and contain particle deformation zones around fragments of the steel wire brush used to prepare the surface for bonding. Sample-scale gradients are also observed, manifested as differences between the subsurface, intermediate and central layers, where the distributions of texture components are different. These heterogeneities affect the progress of recrystallization. While the subsurface and near-interface regions typically contain lower frequencies of cube-oriented grains than anywhere else in the sample, a strong cube texture forms in the sample during recrystallization, attributed to both a high nucleation rate and fast growth rate of cube-oriented grains. The observations highlight the sensitivity of recrystallization to heterogeneity in the deformation microstructure and demonstrate the importance of characterizing this heterogeneity over several length scales.

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Gradient nanostructured surface of a Cu plate processed by incremental frictional sliding

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IOP Conference Series: materials science and Engineering 2015年第1期89卷

作者： C Hong X Huang N Hansen Danish-Chinese Center for Nanometals Section for Materials Science and Advanced Characterization Department of Wind Energy Technical University of Denmark Risø Campus 4000 Roskilde Denmark

The flat surface of a Cu plate was processed by incremental frictional sliding at liquid nitrogen temperature. The surface treatment results in a hardened gradient surface layer as thick as 1 mm in the Cu plate, which contains a nanostructured layer on the top with a boundary spacing of the order of 100 nm. The boundary spacing increases with increasing distance from the surface, and is accompanied with a decrease in hardness from 2179±31MPa in the topmost surface layer to 568±10 MPa in the undeformed matrix.

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Recovery by triple junction motion in heavily deformed metals

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IOP Conference Series: materials science and Engineering 2015年第1期89卷

作者： T Yu N Hansen X Huang Danish-Chinese Centre for Nanometals Section for Materials Science and Advanced Characterization Department of Wind Energy Risø Campus Technical University of Denmark DK-4000 Roskilde Denmark

A number of processes may occur during recovery, which reduce the stored energy and coarsen the structure, paving the way for the nucleation of recrystallization. In this review, recovery is discussed based on the initial deformed structure. Recovery in samples deformed to low-to-medium strains is briefly considered, whereas recovery in samples deformed to much higher strains is discussed in more detail. An example is Al, where a new and important recovery mechanism is triple junction motion, which can remove thin lamellae and consequently increase the thickness of neighbouring lamellae. This recovery mechanism therefore coarsens the structure and causes a gradual transition from a lamellar to a near equiaxed structure preceding recrystallization. This mechanism is discussed in conjunction with structural pinning, which stabilizes the coarsening microstructure, thereby balancing the forces controlling the rate of recovery by triple junction motion. Operation of triple junction motion in other heavily deformed metals, such as Ni and Cu, is also briefly discussed.

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Structural coarsening during annealing of an aluminum plate heavily deformed using ECAE

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IOP Conference Series: materials science and Engineering 2015年第1期89卷

作者： O V Mishin Y B Zhang A Godfrey Danish-Chinese Center for Nanometals Section for Materials Science and Advanced Characterization Department of Wind Energy Technical University of Denmark Risø Campus 4000 Roskilde Denmark Key Laboratory of Advanced Materials (MOE) School of Materials Science and Engineering Tsinghua University Beijing 100084 China

The microstructure and softening behaviour have been investigated in an aluminum plate heavily deformed by equal channel angular extrusion and subsequently annealed at 170 °C. It is found that at this temperature the microstructure evolves by coarsening with no apparent signs of recrystallization even after 2 h of annealing. Both coarsening and softening are rapid within first 10 minutes of annealing followed by a slower evolution with increasing annealing duration. Evidence of triple junction (TJ) motion during coarsening is obtained by inspecting the microstructure in one region using the electron backscatter diffraction technique both before and after annealing for 10 minutes. The fraction of fast-migrating TJs is found to strongly depend of the type of boundaries composing a junction. The greatest fraction of fast- migrating TJs is in the group, where all boundaries forming a junction are high angle boundaries. The fraction of fast-migrating TJs is significantly lower for junctions containing at least one low angle boundary.

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Evolution of microstructure and texture during recovery and recrystallization in heavily rolled aluminum

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IOP Conference Series: materials science and Engineering 2015年第1期82卷

作者： O V Mishin A Godfrey T Yu N Hansen D Juul Jensen Danish-Chinese Center for Nanometals Section for Materials Science and Advanced Characterization Department of Wind Energy Technical University of Denmark Risø Campus 4000 Roskilde Denmark Key Laboratory of Advanced Materials (MOE) School of Materials Science and Engineering Tsinghua University Beijing 100084 China

The annealing behavior of nanostructured aluminum AA1050 prepared by cold rolling to an ultrahigh strain (εvM = 6.4) has been investigated using both transmission electron microscopy and electron backscatter diffraction techniques, paying particular attention to changes in microstructure and texture during recovery and their influence on subsequent recrystallization. It is found that coarsening of lamellar structures during recovery can occur via triple junction motion, and that this process can modify the proportion of different boundary types and texture components compared to those in the cold rolled material. Additionally, the heavily deformed material is characterized by different textures and different spatial arrangements of rolling texture components in the center and subsurface. It is found that changes in the misorientation distribution and texture during coarsening are greatly affected by the initial spatial distribution of crystallographic orientations. In particular, the reduction in the fraction of high angle boundaries observed during recovery is much more pronounced in the subsurface layers than in the center layer. The initial through-thickness heterogeneity is thus greatly enhanced during recovery, which leads to significant differences in recrystallized microstructure and texture in the different layers.

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Recrystallization textures and microstructures of Al-0.3%Cu alloy after deformation to high strains

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IOP Conference Series: materials science and Engineering 2015年第1期89卷

作者： X R Li A Wakeel T L Huang G L Wu X Huang College of Materials Science and Engineering Chongqing University Chongqing 400045 China Danish-Chinese Center for Nanometals Section for Materials Science and Advanced Characterization Department of Wind Energy Technical University of Denmark Risø Campus 4000 Roskilde Denmark

An Al-0.3%Cu alloy was deformed to high strains by cold rolling. The as-deformed samples were annealed at different temperatures until complete recrystallization. The cold rolling textures were determined by X-ray diffraction while the recrystallization textures and microstructures were characterized by electron backscatter diffraction. It was found that the rolling texture was characterized by a strong Brass component. After complete recrystallization Goss and Cube textures were developed. The effects of deformation strain and annealing temperature on the recrystallization textures are discussed.

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Development of a strong Goss texture during annealing of a heavily rolled Al—0.3% Cu alloy

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IOP Conference Series: materials science and Engineering 2015年第1期82卷

作者： A Wakeel T L Huang G L Wu O V Mishin X Huang College of Materials Science and Engineering Chongqing University Chongqing 400045 China Danish-Chinese Center for Nanometals Section for Materials Science and Advanced Characterization Department of Wind Energy Technical University of Denmark Risø Campus 4000 Roskilde Denmark

The evolution of microstructure and texture during isochronal annealing of a heavily cold rolled Al-0.3% Cu alloy has been characterized using electron backscatter diffraction. It is found that the rolling texture of this alloy is dominated by the Brass component and that recrystallization during annealing leads to the formation of a pronounced Goss texture. It is suggested that the development of the strong Goss texture in Al-0.3% Cu is caused by preferred growth of Goss-oriented grains into the Brass-oriented matrix.

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