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Surface decarburization characteristics and relation between decarburized types and heating temperature of spring steel 60Si2MnA

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International Journal of Minerals,Metallurgy and Materials 2013年第8期20卷 720-724页

作者： Chao-lei Zhang le-yu zhou Ya-zheng Liu School of Materials Science and Engineering University of Science and Technology Beijing

The characteristics of complete and partial decarburizations in spring steel 60Si2MnA were systematically investigated, including the microstructure, the hardness gradient, and the formation mechanism. The relation between decarburized types and heating temperature of the steel was comprehensively discussed. It is found that heating temper- ature has an important influence on the decarburized types. With the rise of heating temperature, the decarburized types change from no decarburization to complete decarburization, complete and partial decarburizations, partial decarburiza- tion, and no decarburization.

关键词： spring steel decarburization temperature microstructure hardness

Forming condition and control strategy of ferrite decarburization in 60Si2MnA spring steel wires for automotive suspensions

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International Journal of Minerals,Metallurgy and Materials 2012年第2期19卷 116-121页

作者： Chao-lei Zhang Ya-zheng Liu le-yu zhou Chao Jiang Jin-fu Xiao School of Materials Science and Engineering University of Science and Technology BeijingBeijing 10083China

The ferrite decarburization behavior of 60Si2MnA spring steel wires for automotive suspensions, including the forming condition and the influence of heating time and cooling rate after hot rolling, was investigated comprehensively. Also, a control strategy during the reheating process and cooling process after rolling was put forward to protect against ferrite decarburization. The results show that ferrite decarburization, which has the strong temperature dependence due to phase transformation, is produced between 675 and 875°C. The maximum depth is found at 750°C. Heating time and cooling rate after rolling have an important influence on decarburization. Reasonable preheating temperature in the billet reheating process and austenitizing temperature in the heat-treatment process are suggested to protect against ferrite decarburization.

关键词： spring steel decarburization phase transformations controlled cooling

Microstructure and texture evolution of cold-rolled deep-drawing steel sheet during annealing

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International Journal of Minerals,Metallurgy and Materials 2013年第6期20卷 541-548页

作者： le-yu zhou lei Wu Ya-zheng Liu Xiao-jie Cheng Jin-hong Sun School of Materials Science and Engineering University of Science and Technology Beijing

In accordance with experimental results about the annealing microstructure and texture of cold-rolled deep- drawing sheet based on the compact strip production （CSP） process, a two-dimensional cellular automation simulation model, considering real space and time scale, was established to simulate recrystallization and grain growth during the actual batch annealing process. The simulation results show that pancaked grains form during recrystallization. （111} advantageous texture components become the main parts of the recrystallization texture. After grain growth, the pancaked grains coarsen gradually. The content of （111} advantageous texture components in the annealing texture increases from 55vo1% to 65vo1%; meanwhile, the contents of {112}〈110〉 and {100}〈110〉 texture components decrease by 4% and 8%, respectively, compared with the recrystallization texture. The simulation results of microstructure and texture evolution are also consistent with the experimental ones, proving the accuracy and usefulness of the model.

关键词： cold rolling deep drawing steel sheet cellular automata, recrystallization annealing

Dynamic Recrystallization Behavior of GCr15SiMn Bearing Steel during Hot Deformation

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Journal of Iron and Steel Research International 2014年第11期21卷 1042-1048页

作者： Dan ZHANG Ya-zheng LIU le-yu zhou Qiang HAN Bo JIANG Zhong-zhi LI School of Material Science and Engineering University of Science and Technology Beijing Dongbei Special Steel Group Corporation Limited

The hot deformation behavior of GCr15SiMn steel was studied through high temperature compression tests on the Gleeble-1500 thermal-mechanical simulator. The initiation and evolution of dynamic recrystallization （DRX） were investigated with microstructural analysis and then the process variables were derived from flow curves. In the present deformation conditions, the curves of strain hardening exponent （n） and the true strain （e） at the deformation temperature of 1423 K and strain rates of 0.1, 1 and 10 s^-1 exhibit single peak and single valley. According to Zener-Hollomon and Ludwik equation, the experimental data have been regressed by using linear method. An expression of Z parameter and hot deformation equation of the tested steel were established. Moreover, the Q values of GCrlSSiMn and GCr15 steels were compared. In order to determine the recrystallization fraction under different con ditions, the volume fraction of DRX as a function of process variables, such as strain rate （ε）, temperature （T）, and strain （ε）, was established. Itwas found that the calculated results agreed with the mierostructure of the steel at any deformation conditions.

关键词： GCr15SiMn strain hardening exponent dynamic recrystallization critical strain kinetic model

Microstructure and microtexture evolution characteristics of a powder metallurgy Ni-based superalloy during static recrystallization

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Journal of Iron and Steel Research International 2024年第9期31卷 2308-2325页

作者： Zhi-qiang Li De-cheng Wang yue-wen Zhai Chao Jiang le-yu zhou Zhi-guang zhou Hui-zhen Wang Zi-bo Zhang Lin Yan Li-ping Wang Guang yu Department of Mechanical Engineering Tsinghua UniversityBeijing100084China Beijing Research Institute of Mechanical and Electrical Technology Co. Ltd.CAMBeijing100083China China Academy of Machinery Science and Technology Group Beijing100044China Institute of Advanced Manufacturing and Intelligent Technology Beijing University of TechnologyBeijing100124China

Static recrystallization(SRX)characteristics of a powder metallurgy superalloy were investigated by isothermal compression at 1080–1170℃ under strain rates of 0.01–0.1 s^(−1),strains of 0.1,0.22,or 0.5,and holding time of 0–300 *** impacts of temperature,strain rate,holding time,and strain on the SRXed grain size,volume fraction,and microtexture were explored by electron backscatter diffraction *** was found that temperature played a key role in these *** SRX progressed,thefiber parallel to the axis compression direction gradually weakened and was replaced by thefiber becausewas the preferred recrystallization orientation and grain growth direction for the Ni-based ***,high temperatures and low strain rates promoted the formation of the*** nucleation mechanisms during SRX process were found:grain boundary bulging,primary twin assistance,and subgrain *** boundary bulging occurred under all process conditions;however,at low temperatures and high strain rates,the latter two mechanisms could provide additional nucleation *** addition,SRX size and volume fraction models were established.

关键词： Powder metallurgy Ni-based superalloy Static recrystallization Microtexture evolution Recrystallization mechanism Prediction model

Reduction of Fe concentration in Al–4Si–1Fe–1Cu–0.5Zn–0.5Mn alloys with S

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Rare Metals 2016年第4期35卷 320-324页

作者： Chao Fan Si-yuan Long Tian Wang Yan-Yan Huang Juan Du Huai-De Yang yu-le zhou College of Materials Science and Engineering Chongqing University Chongqing 400030 China Engineering Training Center Guangxi University of Science and Technology Liuzhou 545006 China

In this article, the effect of sulfur on the reduction of Fe concentration in aluminum alloy scraps was investigated. The iron content decreases from 1.224 wt% to 〈0.854 wt% and achieves an optimal ratio of 30 % when the sulfur addition is 3 %. Thermodynamic calculations, the X-ray diffraction （XRD）, scanning elec- tron microscope （SEM）, and differential scanning calorimetry （DSC） analyses of the sample indicate that the formation of FeS can occur spontaneously in molten aluminum with the addition of sulfur. The mechanism of Feremoving purification process was also discussed.

关键词： Aluminum alloy scraps Iron Sulfur Purification

Effect of Strengthening Phase on Deformation Behaviour during Uniaxial Tension of Hot-rolled Dual Phase Steel

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Journal of Iron and Steel Research International 2014年第12期21卷 1111-1115页

作者： le-yu zhou Bo JIANG Tian-hao CUI Dan ZHANG Jian-zhong HE Ya-zheng LIU School of Materials Science and Engineering University of Science and Technology Beijing Technology Center Baotou Iron & Steel Group Co.Ltd.

Two kinds of C-Si-Mn-Cr series tested steels were designed to obtain dual phase microstructures of ferrite （F）＋martcnsite （M） or ferrite （F）-bainite （B） with different mechanical properties. Effects of strengthening phase on yielding and fracture behaviours during uniaxial tension of dual phase steel were discussed. Compared with hot-rolled martensite dual phase steel, ferrite-bainite dual phase steel has high ratio of yield strength to tensile strength （YS/TS） and low elongation. During necking process of uniaxial tension, microvoids of ferrite-martensite steel are generated by fracture of ferrite/martensite boundary or martensite islands with irregular shape. But ferrite matrix elongated remarkably along deformation direction, and strengthening phase also coordinated with ferrite matrix. Compatible de formation between ferrite and bainite is distinct. Ferrite-bainite dual phase steel has fine and less microvoid, and phase boundary of ferrite and bainite is beneficial for restraining generation and extending of microvoid.

关键词： hot-rolled dual phase steel strengthening phase yielding necking microvoid

Nanostructured ZnO/BiVO_(4)I-scheme heterojunctions for piezocatalytic degradation of organic dyes via harvesting ultrasonic vibration energy

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 488-497页

作者： Yiling Li Xiaoyao yu Yingjie zhou Yao Lin Ying Wu Key Laboratory of the Ministry of Education for Advanced Catalysis Materials College of Chemistry and Materials ScienceZhejiang Normal UniversityJinhua 321004China

BiVO_(4)porous spheres modified by ZnO were designed and synthesized using a facile two-step *** resulting ZnO/BiVO_(4)composite catalysts have shown remarkable efficiency as piezoelectric catalysts for degrading Rhodamine B(RhB)unde mechanical vibrations,they exhibit superior activity compared to pure *** 40wt%ZnO/BiVO_(4)heterojunction composite displayed the highest activity,along with good stability and *** enhanced piezoelectric catalytic activity can be attributed to the form ation of an I-scheme heterojunction structure,which can effectively inhibit the electron-hole ***,hole(h+)and superoxide radical(·O_(2)^(-))are proved to be the primary active ***,ZnO/BiVO_(4)stands as an efficient and stable piezoelectric catalyst with broad potential application in the field of environmental water pollution treatment.

关键词： piezoelectric catalytic heterojunction dye degradation ultrasonic vibration

Integration of Electrical Properties and Polarization Loss Modulation on Atomic Fe–N‑RGO for Boosting Electromagnetic Wave Absorption

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Nano-Micro letters 2025年第2期17卷 517-532页

作者： Kaili Zhang yuefeng Yan Zhen Wang Guansheng Ma Dechang Jia Xiaoxiao Huang yu zhou State Key Laboratory of Precision Welding&Joining of Materials and Structures Harbin Institute of TechnologyHarbin 150001People’s Republic of China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001People’s Republic of China MIIT Key Laboratory of Advanced Structural‑Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001People’s Republic of China

Developing effective strategies to regulate graphene’s conduction loss and polarization has become a key to expanding its application in the electromagnetic wave absorption(EMWA)*** on the unique energy band structure of graphene,regulating its bandgap and electrical properties by introducing heteroatoms is considered a feasible ***,metal-nitrogen doping reduced graphene oxide(M–N-RGO)was prepared by embedding a series of single metal atoms M–N_(4) sites(M=Mn,Fe,Co,Ni,Cu,Zn,Nb,Cd,and Sn)in RGO using an N-coordination atom-assisted *** composites had adjustable conductivity and polarization to optimize dielectric loss and impedance matching for efficient EMWA *** results showed that the minimum reflection loss(RL_(min))of Fe–N-RGO reaches−74.05 dB(2.0 mm)and the maximum effective absorption bandwidth(EAB_(max))is 7.05 GHz(1.89 mm)even with a low filler loading of only 1 wt%.Combined with X-ray absorption spectra(XAFS),atomic force microscopy,and density functional theory calculation analysis,the Fe–N_(4) can be used as the polarization center to increase dipole polarization,interface polarization and defect-induced polarization due to d-p orbital hybridization and structural ***,electron migration within the Fe further leads to conduction loss,thereby synergistically promoting energy *** study demonstrates the effectiveness of metal-nitrogen doping in regulating the graphene′s dielectric properties,which provides an important basis for further investigation of the loss mechanism.

关键词： Electromagnetic wave absorption Fe-N-RGO Dipole polarization Conduction loss Impedance matching