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Influence of Alloy Elements on Magnetic Properties of Fe-based Amorphous Alloys

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Journal of materials Science & technology 2000年第2期16卷 157-158页

作者： Guiqin ZHOU, Fazeng LIAN and Guozhen LI (Institute of materials and Metallurgy, Northeastern university, shenyang 110006, china) Institute of materials and Metallurgy Northeastern University Shenyang 110006 China

The influence of alloy elements on dc and ac magnetic properties of Fe79M2Si6B11C2(M is V, Mo or Cr) amorphous alloys was investigated. The variation law of the magnetic properties and the loss with the different elements was studied. The results show that the addition of V, Cr or Mo elements reduces the saturation magnetic induction in varying degrees. The addition of V element increases the permeability, decreases the coercivity and drops the loss. The addition of Cr and Mo reduces the permeability, and increases the coercivity.

关键词： Amorphous Alloys magnetic properties magnetic induction variation law

SPALLING MECHANISM OF NITRIDED LAYER OF AUSTENITIC STEEL 4Cr14Ni14W2Mo

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Acta Metallurgica Sinica(English Letters) 1989年第5期2卷 374-376页

作者： SUN Xudong LI Jian Northeast university of technology,shenyang,china Lecturer,Dept.of materials Science and Engineering,Northeast university of technology,shenyang,china

The tendency of spalling of the nitrided layer of the hot rolled austenitic steel 4Cr14Ni14W2Mo exhibits close relation to the nitrided surface orientation relative to the rol- led steel *** is found that the dislocations in the imperfectly recrystalized steel align as parallel dislocation walls in macroscopic extent,and the thickness of the“white sublayer”in the nitrided layer is much larger at the surface which is parallel to the dislocation *** such surface the spalling of the nitrided layer happens often.

关键词： nitriding spalling heat resistant steel

Large eddy simulation of fuel injection and mixing process in a diesel engine

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Acta Mechanica Sinica 2011年第4期27卷 519-530页

作者： Lei Zhou.Mao-Zhao Xie.Ming Jia.Jun-Rui Shi school of Energy and Power Engineering,Dalian university of technology,116024 Dalian,china Department of Power Engineering,shenyang Institute of Engineering,110136 shenyang,china school of Energy and Power Engineering Dalian University of Technology Dalian China Department of Power Engineering Shenyang Institute of Engineering Shenyang China

The large eddy simulation （LES） approach implemented in the KIVA-3V code and based on one-equation sub-grid turbulent kinetic energy model are employed for numerical computation of diesel sprays in a constant volume vessel and in a Caterpillar 3400 series diesel engine. Computational results are compared with those obtained by an RANS （RNG k-e） model as well as with experimental data. The sensitivity of the LES results to mesh resolution is also discussed. The results show that LES generally provides flow and spray characteristics in better agreement with experimental data than RANS; and that small-scale random vortical structures of the in-cylinder turbulent spray field can be captured by LES. Furthermore, the penetrations of fuel droplets and vapors calculated by LES are larger than the RANS result, and the sub-grid turbulent kinetic energy and sub-grid turbulent viscosity provided by the LES model are evidently less than those calculated by the RANS model. Finally, it is found that the initial swirl significantly affects the spray penetration and the distribution of fuel vapor within the combustion chamber.

关键词： Large eddy simulation Diesel engine Fuelspray

Two-Sublattice Thermodynamic Model on Carbonitride Precipitation in Microalloyed Steels Bearing Nb-V-Ti

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Journal of Iron and Steel Research International 2011年第S1期18卷 271-277页

作者： XIANG Song 1,3,LIU Guo-quan 2 (1.school of materials and Metallurgy,Guizhou university,Guiyang 550003,Guizhou,china 2.school of materials Science and Engineering,university of Science and technology,Beijing,Beijing 100083,china 3.The Key Laboratory for Mechanical Behavior and Microstructure of materials,Guizhou Province,Guiyang 550003,Guizhou,china) Guizhou Univ Sch Met & Mat Guiyang 550003 Guizhou Peoples R China Univ Sci & Technol Beijing Sch Mat Sci & Engn Beijing 100083 Peoples R China Key Lab Mech Behav & Microstruct Mat Guiyang 550003 Guizhou Peoples R China

Based on the two sublattice model of the regular solution,one being metal atom sublattice and another being interstitial atom sublattice,a thermodynamic model for the precipitates of niobium carbonitride,vanadium carbonitride and titanium carbonitride was established to study the starting-temperature of precipitates and the austenite compositions at given temperature in a low carbon *** calculation results show that starting-temperature of the precipitation of niobium carbonitride,vanadium carbonitride and titanium carbonitride are 1100℃,920℃ and 1340℃,respectively,the mole fraction of carbonitride precipitates is 8.65×10-4 in the 0.053C-0.0028N-1.28Mn-0.008S-0.031Al-0.046Nb-0.008Ti0.029V-Fe *** the N content is from 0.0028% to 0.0056%,the starting-temperature of the precipitation of the titanium carbonitride changes from 1340℃ to 1430℃.And the C content is from 0.053% to 0.07%,the startingtemperature of the precipitation of the titanium carbonitride hardly changes,but the atomic fraction of niobium in the carbonitride obviously increases.

关键词： microalloyed steel carbonitride precipitation two sublattice model thermodynamics

Ni-based Ni-Fe-B-Si-Ta bulk metallic glasses

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Science china(Physics,Mechanics & Astronomy) 2010年第3期53卷 440-444页

作者： ZHU ChunLei1, WANG Qing1, ZHAO YaJun1, WANG YingMin1, QIANG JianBing1 & DONG Chuang1,21 Key Lab of materials Modification (Ministry of Education), school of materials Science and Engineering, Dalian university of technology, Dalian 116024, china 2 International Center for materials Physics, Chinese Academy of Sciences, shenyang 110016, china 1. Key Lab of materials Modification (Ministry of Education) School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China2. International Center for Materials Physics Chinese Academy of Sciences Shenyang 110016 China

The glass-forming ability and properties of Ni-based Ni-Fe-B-Si-Ta bulk metallic glasses are explored in this work. The alloy compositions are determined by using a combination of the cluster line approach, the multi-alloying strategy and the substitutions of similar elements. Bulk metallic glasses with diameters of 3 mm take shape at compositions formulated under the clus- ter-plus-glue-atom model [M9B]B~[(Ni1-xFex)7.71(Si0.66Ta0.34)1.29B]B0.94=(Ni1-xFex)70.5B17.7Si7.8Ta4, x=0.35–0.45, where the bracketed part is the cluster and the unbracketed part is the glue atoms. These alloys exhibit good magnetic properties. The maximum Is is found in the (Ni0.55Fe0.45)70.5B17.7Si7.8Ta4 alloy which reaches 0.51 T, with its Hc as low as 8.5 A/m. Interestingly, these alloys display dual glass transitions at (Ni0.65Fe0.35)70.5B17.7Si7.8Ta4, (Ni0.60Fe0.4)70.5B17.7Si7.8Ta4 and (Ni0.55Fe0.45)70.5B17.7- Si7.8Ta4 as unveiled by Temperature-Modulated Differential Scanning Calorimetry.

关键词： bulk metallic glasses cluster Ni-Fe-based alloys Modulated Differential Scanning Calorimetry

Investigation of Electrostatic Atomization and Its Application for the Synthesis of Fine Ceramic Powder

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沈阳建筑大学学报（自然科学版） 2011年第6期27卷 1127-1136页

作者：时方晓 school of materials Science and Engineering Shenyang Jianzhu University

In the present study,electrostatic atomization(EA)behavior of several test liquids having much higher viscosities(1 400 mPa·s)than have previously been studied was investigated by spraying at a series of applied voltages and flow *** results showed that to obtain stable cone-jet mode spraying and hence gain better monodispersity of droplets,electrical conductivity,viscosity and surface tension of the liquid are important controlling *** stable cone-jet mode could be easily established for liquids having shear viscosities in the range from 80 to 1 400 mPa·s and surface tensions below 65 mN·*** contrast,methylcellulose aqueous solutions with shear viscosities ranging from 10 to 540 mPa·s and moderate surface tensions(50~56 mN·m-1)generated more complicated spraying ***,fine TiO2 powder(a few micrometers in size)could be prepared using the EA method from its precursor solutions.

关键词： electrostatic atomization spraying electrical conductivity viscosity surface tension cone-jet

Hopkinson Effect in Soft Magnetic materials

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Journal of materials Science & technology 2000年第2期16卷 145-147页

作者： Kaiyuan HE, Hui XU, Zhi WANG and Lizhi CHENG (Department of materials Science and Engineering, Northeastern university, shenyang 110006, china) Department of materials Science and Engineering Northeastern University Shenyang 110006 China

The μi-T curves of the alloy Fe73.5Cu1 Nb3Si13.5B9 in the amorphous state and in the nanocrys-talline state have been investigated. For comparison, μi-T curves of the other two kinds of typical soft magnetic alloys also have been measured. It was found that a sharp Hopkinson peak appeared at the Curie point for each amorphous and crystalline alloy but there was no Hopkinson peak for the nanocrystalline alloy at the Curie point of the residual amorphous phase. This phenomenon has been explained in terms of the characteristic temperature dependence of the effective magnetic anisotropy.

关键词： Hopkinson Effect in Soft Magnetic materials

Thermal Shock Behaviour of Alumina-Iron Composites

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Journal of materials Science & technology 2002年第4期18卷 347-350页

作者： M.M.El-Sayed Seleman, Xudong SUN and Liang ZUOschool of materials and Metallurgy, Northeastern university, shenyang 110006, china Sch. of Mat. and Metall. Northeastern Univ. Shenyang 110006 China

Thermal shock behaviour was investigated for two morphologically different composites comprising an alumina matrix and 20 vol. pct Fe particles for a wide range of quenching temperature differences (AT=100~800癈) and compared to a monolithic alumina. The retained strength and critical quenching temperature difference, Tcr of the two composites were a significant improvement over the values for the respective monolithic alumina. Crack lengths and densities were shown to be greater for the alumina than for the two composites at all quenching temperature differences. The thermal shock resistance parameters for monolithic alumina and the two composites were calculated according to their mechanical and physical properties. The calculated results agree well with the experimental one and indicate possible explanations for the differences in thermal shock behaviour.

关键词： Alumina-iron composite thermal shock behaviour Retained strength

Structures and Properties of Nanocrystalline Nd_(4.5)Fe_(75)Co_1Si_1B_(18.5) Composite Magnets

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Journal of materials Science & technology 2000年第2期16卷 121-122页

作者： Wenli PEI, Fazeng LIAN and Guiqin ZHOU (Department of materials Science and Engineering, Northeastern university, shenyang 110006, china) Jinguo LI (Institute of Metal Research, Chinese Academy of Sciences, shenyang 110015, china) Department of materials Science and Engineering Northeastern University Shenyang 110006 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

In this article, the quenched Nd_4.5Fe_75Co_1Si_l B_18.5 ribbons were prepared, and the structures and properties were investigated. The results show that the change of structures of Nd_4.5 Fe_75 Co_1 Si_1 B_18.5 quenched amorphous ribbons is Am→Am'+Fe_3B+Nd_2Fe_23B_3+Nd_2Fe_14B→Nd_2- Fe_14B when it is heated. The effect of crystallizing treatment temperature and time on the magnetic properties of the quenched alloy was studied. The magnetic properties of 16 m/s quenched ribbons for 710℃×1200 s crystallizing treatment reach _iH_c=238.6 hA/m, B_r=0.8987 T and (BH)max=51.39 kJ/m^3. The grain size is about DFe3=32 nm and DNd2Fe14B=22 nm.

关键词： Composite Magnets Fe Structures and Properties of Nanocrystalline Nd Si