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Alloy design by dislocation engineering

Journal of materials Science & Technology 2018年第3期34卷 417-420页

作者： m.X.Huang b.b.He Department of mechanical Engineering The University of Hong Kong

Ultra-high strength alloys with good ductility are ideal materials for lightweight structural application in various industries. However, improving the strength of alloys frequently results in a reduction in ductility, which is known as the strength-ductility trade-off in metallic materials. Current alloy design strategies for improving the ductility of ultra-high strength alloys mainly focus on the selection of alloy composition （atomic length scale） or manipulating ultra-fine and nano-grained microstructure （grain length scale）. The intermediate length scale between atomic and grain scales is the dislocation length scale. A new alloy design concept based on such dislocation length scale, namely dislocation engineering, is illustrated in the present work. This dislocation engineering concept has been successfully substantiated by the design and fabrication of a deformed and partitioned （D＆P） steel with a yield strength of 2,2 GPa and an uniform elongation of 16%. In this D＆P steel, high dislocation density can not only increase strength but also improve ductility. High dislocation density is mainly responsible for the improved yield strength through dislocation forest hardening, whilst the improved ductility is achieved by the glide of intensive mobile dislocations and well-controlled transformation-induced plasticity （TRIP） effect, both of which are governed by the high dislocation density resulting from warm rolling and martensitic transformation during cold rolling. In addition, the present work proposes for the first time to apply such dislocation engineering concept to the quenching and partitioning （Q＆P） steel by incorporating a warm rolling process prior to the quenching step, with an aim to improve simultaneously the strength and ductility of the Q＆P steel. It is believed that dislocation engineering provides a new promising alloy design strategy for producing novel strong and ductile alloys.

关键词： Alioy design Dislocation engineering D&P steel Q&P steel TRIP Warm rolling

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Incipient motion of gravel in a bottomless arch culvert

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International Journal of Sediment Research 2011年第1期26卷 15-26页

作者： b.m.CROOKSTON b.P.m.TULLIS Utah State University 8200 Old Main HillLoganUT 84322

Incipient motion was investigated for four gravel substrate materials in a bottomless arch culvert and a rectangular *** methods for calculating Shields parameter at incipient motion（θc） based upon local flow parameters were *** incipient motion region for bottomless arch culverts in fully turbulent flow was defined with two bounding curves on Shields *** variation ofθcas a function of relative roughness was ***,a method that utilizes measured flow velocities to determine stable substrate particle diameters for bottomless arched culverts is presented as an alternative to the Shields diagram.

关键词： Incipient motion bottomless arch culvert Shields parameter Flow rate Experiment

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Nonlinear elastic constitutive relations of residually stressed composites with stiff curved fibres

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Applied mathematics and mechanics(English Edition) 2022年第10期43卷 1515-1530页

作者： m.H.b.m.Shariff J.merodio R.bustamante Department of mathematics Khalifa University of Science and TechnologyAbu Dhabi127788United Arab Emirates Departamento de matemática Aplicada a las TIC ETS de Ingeniería de Sistemas InformaticosUniversidad Politecnica de MadridMadrid28031Spain Departamento de Ingeniería mecánica Universidad de ChileBeauchef 851Santiago CentroSantiago8370448Chile

mechanical models of residually stressed fibre-reinforced solids,which do not resist bending,have been developed in the ***,in some residually stressed fibre-reinforced elastic solids,resistance to fibre bending is significant,and the mechanical behavior of such solids should be ***,in this paper,we model the mechanical aspect of residually stressed elastic solids with bending stiffness due to fibre curvature,which up to the authors’knowledge has not been mechanically modeled in the *** proposed constitutive equation involves a nonsymmetric stress and a couple-stress *** invariants are used in the constitutive equation,where each spectral invariant has an intelligible physical meaning,and hence they are useful in experiment and analysis.A prototype strain energy function is ***,we use this prototype to give results for some cylindrical boundary value problems.

关键词： fibre-reinforced solid residual stress bending stiffness spectral invariant second gradient finite elasticity

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Critical Finite Size Scaling Relation of the Order-Parameter Probability Distribution for the Three-Dimensional Ising model on the Creutz Cellular Automaton

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Chinese Physics Letters 2006年第10期23卷 2670-2673页

作者： b.Kutlu m.Civi Department of Physics Gazi University 06500 Ankara Turkey

We study the order parameter probability distribution at the critical point for the three-dimensional spin-1/2 and spin-1 Ising models on the simple cubic lattice under periodic boundary conditions. The finite size scaling relation for the order parameter probability distribution is tested and verified numerically by microcanonical Creutz cellular automata simulations. The state critical exponent δ, which characterizes the far tail regime of the scaling order parameter probability distribution, is estimated for three-dimensional Ising models using the cellular automaton simulations at the critical temperature. The results are in good agreement with the monte Carlo calculations.

关键词： bLUmE-CAPEL mODEL mONTE-CARLO RENORmALIZATION-GROUP TRICRITICAL bEHAVIOR FREE-ENERGY mAGNETIZATION UNIVERSALITY SImULATION DImENSIONS EXPONENTS

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Characterization of Austenite Dynamic Recrystallization under Different Z Parameters in a microalloyed Steel

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Journal of materials Science & Technology 2011年第4期27卷 359-363页

作者： m.Shaban b.Eghbali Department of materials Science and Engineering Sahand University of Technology

A low carbon Nb-Ti microalloyed steel was subjected to hot torsion testing over the temperature range 850-1100℃ and strain rates 0.01-1 s-1 to study the influence of deformation conditions on the dynamic recrystallization characteristics of austenite. The results show that dynamic recrystallization occurs more easily with the decrease of strain rate and the increase of deformation temperature. The complete dynamically recrystallized grain size as a function of Zener-Hollomon parameter was established. It was found that dynamically recrystallized grain sizes decrease with increasing strain rate and decreasing deformation temperature. The effect of microalloying elements on peak strain was investigated and the solute drag corrected peak strain was determined. Also, the dynamic recrystallization map of austenite was obtained by using recrystallization critical parameters.

关键词： Dynamic recrystallization microalloyed steel Grain size Hot torsion

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Effects of an Electric Field on the Cylindrical Dust Acoustic Wave in magnetized Complex Plasmas

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Chinese Physics Letters 2012年第7期29卷 184-186页

作者： b.Farokhi m.Eghbali Department of Physics Faculty of ScienceArak UniversityArak 38156-8-8349Iran

Stability of a dust acoustic wave in cylindrical complex plasmas is *** of a static magnetic field (axial) and an electric field (radial) on the propagation of a low frequency wave are *** linear dispersion relations of rotational modes and breathing modes are *** a dusty plasma is confined in a finite region,the void behavior is observed at high speed *** structures of different-mode-number solutions are illustrated.

关键词： wave cylindrical illustrated

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Influence of some rock strength properties on jaw crusher performance in granite quarry

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mining Science and Technology 2010年第2期20卷 204-208页

作者： OLALEYE b m Department of mining Engineering Federal University of Technology

The influence of rock strength properties on Jaw Crusher performance was carried out to determine the effect of rock strength on crushing time and grain size distribution of the *** was conducted on four different rock samples namely marble,dolomite,limestone and granite which were representatively selected from fragmented lumps in *** compressive strength and Point load tests were carried out on each rock sample as well as crushing time and size *** results of the strength parameters of each sample were correlated with the crushing time and the grain size distribution of the rock *** results of the strength tests show that granite has the highest mean value of 101.67 mPa for Unconfined Compressive Strength(UCS) test,6.43 mPa for Point Load test while dolomite has the least mean value of 30.56 mPa for UCS test and 0.95 mPa for Point Load *** to the International Society for Rock mechanic(ISRm) standard,the granite rock sample may be classified as having very high strength and dolomite rock sample,low ***,the granite rock has the highest crushing time(21.0 s) and dolomite rock has the least value(5.0 s).based on the results of the investigation,it was found out that there is a great influence of strength properties on crushing time of rock types.

关键词： rock strength jaw crusher crushing time grain size distribution efficiency

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Application of experimental design in optimization of crude oil adsorption from saline waste water using raw bagasse

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Journal of Central South University 2014年第2期21卷 684-693页

作者： m.behnood b.Nasernejad m.Nikazar Department of Chemical Engineering Amirkabir University of Technology (Tehran Polytechnic)Mahshahr Campus Food Process Engineering and biotechnology Research Center Amirkabir University of Technology(Tehran Polytechnic)

Experimental design was applied in the optimization of crude oil adsorption from saline waste water using raw *** application of response surface methodology(RSm) was presented with temperature,salinity of water,pH,adsorbent dose,and initial oil content as factors.A quadratic model could be used to approximate the mathematical relationship of crude oil removal on the five significant independent *** values and experimental values are found to be in good agreement with R2 of 97.44%.The result of optimization shows that the maximum crude oil removal is equal to 67.38% under the optimal condition of temperature of 46.53 °C,salinity of 37.2 g/L,pH of 3,adsorbent dose of 9 g/L and initial oil content of 300×10-6.

关键词： brine crude oil adsorption raw bagasse experimental design

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Influence of FCA Welding Process Parameters on Distortion of 409m Stainless Steel for Rail Coach building

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Journal of Iron and Steel Research International 2013年第1期20卷 71-78页

作者： m V Venkatesan N murugan b m Prasad A manickavasagam Department of mechanical Engineering Coimbatore Institute of TechnologyCoimbatore 641014TNIndia Integral Coach Factory Indian RailwaysChennai 600038TNIndia

The influence of flux cored arc welding （FCAW） process parameters such as welding current, travel speed, voltage and CO2 shielding gas flow rate on bowing distortion of 409m ferritic stainless steel sheets of 2 mm in thickness was discussed. The bowing distortions of the welded plates were measured using a simple device called profile tracer. An experimental regression equation was developed to predict the bowing distortion and with this equation, it is easy to select optimized process parameters to achieve minimum bowing distortion. It is revealed that the FCAW process parameters have significant influence on bead profile and the bowing distortion.

关键词： bowing distortion ferritic stainless steel flux cored arc welding statistical model rail coach distortion measurement

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Estimate of fine sediment deposit dynamics over a gravel bar using photography analysis

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International Journal of Sediment Research 2013年第2期28卷 220-233页

作者： b.CAmENEN m.JODEAU m.JAbALLAH Irstea HHLY5 rue de la DouaCS 70077-69626 Villeurbanne cedexFrance DrResearch scientist EDF-LNHE 6 quai Watier78401 Chatou cedexFrance DrResearch scientist Irstea HHLY5 rue de la DouaCS 70077-69626 Villeurbanne cedexFrance PhD candidate

Three different methods to analyse fine sediment deposits on a gravel bar using pictures are presented in this paper.A manual digitization and deposits zone delineation are performed as well as two different automated *** three methods are applied on aerial pictures taken in 2006 by a drone from a height around 150 m above the study site. Two other sets of pictures taken in 2010 are also studied:the first set was obtained from the left side bank of the river at approximately 15m above the gravel bar whereas the second one was taken from a helicopter flying 600 m above the *** methods were used to estimate the surface of fine sediment deposits before and after flushing events. They yield similar results even if the first automated procedure is able to capture smaller patches of fine *** total surface of fine sediment deposits seems to be similar before and after a flushing event,but the distribution appears quite *** a flushing event,a significant amount of fine sediment deposits are mixed with coarser *** the flushing event,one can observe more large fine sediment deposits located on the downstream part of the secondary channel and at the channel *** of the small fine sediment deposit patches were washed out. A short discussion is provided on the possible dynamics of fine sediment deposits over the gravel bar.

关键词： Fine sediment deposits Photo analysis Automated procedure Flushing event

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