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Influence of Finishing Cooling Temperature and Holding Time on Nanometer-size Carbide of Nb-Ti Microalloyed Steel

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Journal of Iron and Steel Research International 2014年第4期21卷 433-438页

作者： hai-long yi Yang XU Ming-xue SUN zhen-yu liu guo-dong wang State Key Laboratory of Rolling and Automation Northeastern University

The nanometer-size carbides formed in ferrite matrix of Nb-Ti microalloyed steel at different finishing cooling temperatures and holding time have been investigated. The characteristics of nanometer-size carbides in ferrite were observed by transmission electron microscopy, and mechanical properties of ferrite were detected by a nano-hardness tester. The results showed that interphase precipitation and diffusion precipitation were observed at different finishing cooling temperatures, and the interphase precipitation was planar and curved. Sheet spacing of inter-phase precipitation increased with the increase of finishing cooling temperature and changed a little when holding for 50--1000 s. Interphase precipitation shows higher nano-hardness at 640℃ compared with diffusion precipitation at 600℃, and the contribution of interphase precipitation to the mechanical properties of ferrite was larger than that of diffusion precipitation.

关键词： nanometer-size arbide Nb-Ti microalloyed steel interphase precipitation diffusion precipitation

Artificial Neural Network Modeling of Microstructure During C-Mn and HSLA Plate Rolling

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Journal of Iron and Steel Research International 2009年第2期16卷 80-83页

作者： TAN Wen liu zhen-yu wu di wang guo-dong The State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

An artificial neural network （ANN） model for predicting transformed mierostrueture in conventional rolling process and therrnomechanical controlled process （TMCP） is proposed. The model uses austenite grain size and retained strain, which can be calculated by using microstructure evolution models, together with a measured cooling rate and chemical compositions as inputs and the ferrite grain size and ferrite fraction as outputs. The predicted re- suits show that the model can predict the transformed microstructure which is in good agreement with the measured one, and it is better than the empirical equations. Also, the effect of the alloying elements on transformed products has been analyzed by using the model. The tendency is the same as that in the reported articles. The model can be used further for the optimization of processing parameters, mierostructure and properties in TMCP.

关键词： artificial neural network TMCP microstructure ferrite grain size

Crack Properties of Lean Duplex Stainless Steel 2101 in Hot Forming Processes

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Journal of Iron and Steel Research International 2011年第4期18卷 58-62页

作者： FANG yi-liu liu zhen-yu wang guo-dong State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

The crack behavior of LDX 2101 by hot compression tests in the temperature range of 950 to 1150 ℃ and strain rate range of 0.01 to 30 s-1 was *** hot workability map of LDX 2101 was constructed and the alloy exhibited a better crack resistance at higher temperature and lower strain *** initiated and coalesced into crack at subsurface on the equatorial plane of bulge surface under secondary tensile *** cracks were orientated at an angle of approximately 45° with respect to the compression axis due to the secondary tensile *** easily initiated on the interface of ferrite and austenite and propagated within *** predicted results using specific plastic work approach were matched well with the free surface cracks.

关键词： lean duplex stainless steel hot workability crack specific plastic work approach

Upgrade Rolling Based on Ultra Fast Cooling Technology for C-Mn Steel

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Journal of Iron and Steel Research International 2014年第1期21卷 86-90页

作者： Xiao-guang ZHOU zhen-yu liu Sheng-yong SONG di wu guo-dong wang State Key Laboratory of Rolling and Automation Northeastern University

By measuring the expansion curves of a C-Mn steel at different cooling rates by using an MMS-300 thermo- mechanical simulator, continuous cooling transformation curves were obtained. The new process ＂ultra fast cooling＋ laminar cooling＂ was simulated and the effects of ultra fast cooling ending temperature on microstructure had also been investigated. The hot rolling experiment was done by adopting ＂high temperature rolling-[-forepart ultra fast cooling＂ technologies at laboratory scale. The results revealed that ultra fast cooling can delay the decrease of disloca- tion density and refine ferrite grains. diversity control of the microstructure and phase transformation strengthening can be realized by changing the ultra fast cooling ending temperature. With the decrease of ultra fast cooling ending temperature, the strength and toughness increase, but plasticity does not decrease obviously. The new technique can improve the yield strength by over 50 MPa. Therefore, the upgrade of mechanical properties of C-Mn steel can be realized by using ＂high temperature rolling＋ ultra fast cooling＋laminar cooling＂ technique. Compared with ＂low temperature rolling with large deformation degree＂ technique, this new technology can decrease the roiling force and in- crease the production efficiency.

关键词： ultra fast cooling C-Mn steel grain refinement strengthening phase transformation strengthening grain size

Modeling of Strain-Induced Precipitation Kinetics and Evolution of Austenite Grains in Nb Microalloyed Steels

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Journal of Iron and Steel Research International 2008年第3期15卷 65-69页

作者： ZHOU Xiao-guang liu zhen-yu yuAN Xiang-qian wu di wang guo-dong liu Xiang-hua State Key Laboratory of Rolling Technology and Automation Northeastern University Shenyang 110004 Liaoning China

Considering the effect of strain and chemical composition onprecipitation behavior, new models for the start and end time of Nb（C,N） precipitation in austenite under the conditions of different temperatures and strains have been investigated for Nb microalloyed steel. The value of n in the precipitation kinetic equation has been determined by using the available experimental data in literature, which indicated that n is a constant and independent of temperature. The values of the start and end time of the predicted precipitation are compared with the experimental values. Calculated results are in good agreement with the experimental results. Also, the evolution of austenite grains before ferrite transformation is simulated by taking the effect of precipitation into consideration. The measured austenite grain size is in good agreement with predicted one prior to ferrite transformation.

关键词： strain-induced precipitation start time precipitation static recrystallization grain size

Modeling of Incubation Time for Austenite to Ferrite Phase Transformation

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Journal of Iron and Steel Research International 2006年第4期13卷 32-34,60页

作者： ZHOU Xiao-guan liu zhen-yu wu di wang Wei JIAO Si-hai State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China Institute of Research and Development Baoshan Iron and Steel Co Ltd Shanghai 201900 China

On the basis of the classical nucleation theory, a new model of incubation time for austenite to ferrite transformation has been developed, in which the effect of deformation on austenite has been taken into consideration. To prove the precision of modeling, ferrite transformation starting temperature （Ar3） has been calculated using the Scheil＇s additivity rule, and the Ar3 values were measured using a Gleeble 1500 thermomechanical simulator. The Ar3 values provided by the modeling method coincide with the measured ones, indicating that the model is precise in oredicting the incubation time for austenite to ferrite transformation in hot deformed steels.

关键词： incubation time austenite to ferrite transformation hot deformation modeling

Corrosion behavior of additive-manufactured NiFeCrMo alloys in various corrosion media

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Journal of Iron and Steel Research International 2023年第8期30卷 1574-1585页

作者： dong-peng wang Shuai wang zhen Chen Xing-cheng Xie zhen-zhen dong Hong-zhou dong yi-cheng wu zhen-guang liu Wei-li Li yu-xin wang School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003JiangsuChina GRIMAT Engineering Institute Co. Ltd.Beijing 101407China GRINM(Guangdong)Institute for New Advanced Materials and Technology Dongguan 528041GuangdongChina School of Mechanical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003JiangsuChina

To understand the corrosion performance of additive-manufactured Ni-based in various corrosion media during the actual engineering application environment,the corrosion properties of NiFeCrMo alloys were investigated in 3.5 wt.%NaCl solution,1 mol/L H2SO_(4) solution,and 1 mol/L KOH solution,using potentiodynamic polarization and electrochemical impedance *** electrochemical measurement results revealed that the additive-manufactured NiFeCrMo alloys have higher corrosion resistance in all three solutions,compared with the as-cast *** results of the scanning electron microscope confirmed that the degree of additive-manufactured NiFeCrMo alloys after potentiostatic polarization in all three solutions is less serious.X-ray photoelectron spectroscopy analysis revealed that the enhancement of the corrosion resistance for the additive-manufactured NiFeCrMo alloys is attributed to the modification of the composition of the passive *** manufactured processing promotes the enrichment of the element of Cr or Mo in the passive film and it suppresses the formation of the oxidation of the element of Fe,leading to higher stability of the passive *** reason for the higher corrosion resistance of the additive-manufactured NiFeCrMo alloys was related to the enrichment of the element of Cr,as well as the lower content of the elements of Ni and Fe near the grain boundaries,which are beneficial to forming a more compact passive *** combined results are essential for the applications of high-strength Ni-based as structural materials in a corrosion environment.

关键词： Ni-based alloy Additive manufacturing Corrosion Passive film Corrosion media

Flexible quasi-solid-state sodium-ion full battery with ultralong cycle life,high energy density and high-rate capability

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Nano Research 2022年第2期15卷 925-932页

作者： Chen-De Zhao Jin-Zhi guo zhen-yi Gu Xiao-Tong wang Xin-Xin Zhao Wen-Hao Li hai-yue yu Xing-long wu Faculty of Chemistry Northeast Normal UniversityJilin 130024China MOE Key Laboratory for UV Light-Emitting Materials and Technology Northeast Normal UniversityJilin 130024China

Flexible power sources featuring high-performance,prominent flexibility and raised safety have received mounting attention in the area of wearable electronic ***,many great challenges remain to be overcome,notably the design and fabrication of flexible electrodes with excellent electrochemical performance and matching them with safe and reliable ***,a facile approach for preparing flexible electrodes,which employs carbon cloth derived from commercial cotton cloth as the substrate of cathode and a flexible anode,is proposed and *** promising cathode(NVPOF@FCC)with high conductivity and outstanding flexibility is prepared by efficiently coating Na_(3)V_(2)(PO_(4))_(2)O_(2)F(NVPOF)on flexible carbon cloth(FCC),which exhibits remarkable electrochemical performance and the significantly improved reaction *** importantly,a novel flexible quasi-solid-state sodium-ion full battery(QSFB)is feasibly assembled by sandwiching a P(VDF-HFP)-NaClO_(4) gel-polymer electrolyte film between the advanced NVPOF@FCC cathode and FCC *** the QSFBs are further evaluated in flexible pouch cells,which not only demonstrates excellent energy-storage performance in aspect of great cycling stability and high-rate capability,but also impressive flexibility and *** work offers a feasible and effective strategy for the design of flexible electrodes,paving the way for the progression of practical and sustainable flexible batteries.

关键词： flexible sodium-ion battery gel-polymer electrolyte quasi-solid-state carbon cloth Na_(3)V_(2)(PO_(4))_(2)O_(2)F

Formation of Phosphorous Surface Inverse Segregation in Twin-Roll Cast Strips of Low-Carbon Steels

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Journal of Iron and Steel Research International 2011年第2期18卷 18-23页

作者： ZHOU guo-ping liu zhen-yu yu Shi-chuan CHEN Jun QIU yi-qing wang guo-dong Strip Cold Rolling Plant Tangshan Iron and Steel Group Tangshan 063016 Hebei China State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

The formation of phosphorous surface inverse segregation （SIS） in twin-roll cast strips of low-carbon steels was studied. High phosphorous strips were fabricated by using a pilot twin-roll strip caster and a melt/substrate contacting apparatus, respectively. Solidification structures of strips were observed and analyzed, and phosphorus distributions along longitudinal sections of strips were investigated and discussed. The results showed that solidification structures of all strips were columnar grains, either integrated or coarse in the strip made by the melt/substrate contacting apparatus or damaged in some degree in cast strips; and that during cast strip solidification, enrichment of phosphorus occurred between columnar grains, and the average phosphorus concentration near the surface in the strip with 0.15% of phosphorus was measured to be about 0.27% which was obviously higher than that in the bulk.

关键词： strip casting phosphorus enrichment inverse segregation steel solidification