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Nonlinear Theory on Dynamic Controlling Interface Patterns DuringSolidification of a Dilute Binary Alloy

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International Journal of Minerals,Metallurgy and Materials 1999年第4期13卷 253-258页

作者： Zidong Wang hanqi hu(Material science and Engineering School, university of science and technology beijing, beijing 100083, china) Material science and Engineering School University of Science and Technology Beijing Beijing 100083 China

In non-equilibrium nonlinear region, the nonlinear equations of time dependence of perturbation amplitude at the solid/liquidinterface during solidification of a dilute binary alloy are established on the base of assuming that there is local equilibrium at the solid/liquid interface and considering that curvature, temperature and composition at the solid/liquid interface which are related to the perturbation amplitude are nonlinear. As a result, patterns at the solid/liquid interface during solidification process, which is from nonsteadystate to steady state can be controlled by these nonlinear equations.

关键词： nonlinearity solidification, dilute binary alloy, dynamic control

Relationship between Low Temperature Toughness and Microstructure in Low Activation Fe-Cr-Mn(W,V)Steel for Fusion Reactors

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International Journal of Minerals,Metallurgy and Materials 1999年第2期13卷 111-115页

作者： Benfu hu Chengchang jia(Material science and Engineering School, university of science and technology beijing, beijing 100083, china) Material science and Engineering School University of Science and Technology Beijing Beijing 100083 China

Fe-Cr-Mn (W, V) austenite steel was researched in order to supply a theory base for the first wall materials of fusion *** included vacuum melting, forging, annealing, solution treatment, Charpy impact tests and microstructure observation. Theresults show that the imped value decreases with the test temperature decreasing. In this system, there is ductile/brittle transition. Themechanism of this decrease of the impact value is considered to be due to γ - ε transformation in sub-stable austenite steel and stoppingoverlapping sacking fault by grain boundaries in stable austenite steel.

关键词： fusion reactor first wall materials low temperature toughness Fe-Cr-Mn system

Synthetical Control of AGC/LPC System Based on Neural Networks Internal Model Control

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Journal of university of science and technology beijing 2001年第1期8卷 75-77页

作者： hu He, Xiaodong Luan, Yikang Sun Information Engineering School, university of science and technology beijing, beijing 100083, china Univ Sci & Technol beijing Informat Engn Sch Beijing 100083 Peoples R China

One synthetical control method of AGC/LPC system based on intelligence control theory-neural networks internal model control method is presented. Genetic algorithm (GA) is applied to optimize the parameters of the neu... 详细信息

关键词： hot strip rolling AGC looper neural networks internal model control GA

SOLUBILITY OF NITROGEN IN MOLTEN GRAY CAST IRON

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Acta Metallurgica Sinica(English Letters) 1992年第7期5卷 71-73页

作者： ZHAI Qijie, hu hanqi, university of science and technology beijing, beijing, china hu hanqi, Professor, faculty of foundry, university of science and technology beijing, beijing 100083, china

The expressions of the dependence of nitrogen solubility in molten gray cast iron on the temperature and composition of the melt were proposed under the condition of foundry practice. Three gray cast iron specimens wi... 详细信息

关键词： gray cast iron nitrogen solubility

ALLOYING BEHAVIOUR OF Ca IN STEEL 58CrV

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Acta Metallurgica Sinica(English Letters) 1992年第6期5卷 449-453页

作者： LU Feng CAO Fengyu LI Chengji university of science and technology beijing,beijing,chinaZHANG Yongxiang CHEN Yonggang beijing Institute of Machine Tools,beijing,china faculty of Metallograph,university of science and technology beijing,beijing 100083,china beijing Univ of science and Technology Beijing China

Effect of Ca on hardenability and CCT diagram of steel 58CrV has been investigated by means of end-quenching and thermal *** addition of 0.006 wt-%Ca to the steel may improve the hardenability,reduce the critical cooling rate of transformation of pearlite or bainite under continuous cooling and increase the M_*** analysis showed that Ca segre- gates markedly along austenitie grain boundaries,and accelecrates the segregation of C,Cr and *** is believed that besides towards deoxidizing and desulphurizing as well as improving sulphide morphology,a trace of Ca in steel 58CrV behaves towards microalloying.

关键词： Ca steel 58CrV microalloying hardenability CCT diagram

EFFECT OF COMPOSITION ON HYDROGEN EMBRITTLEMENT IN Ni-Fe FCC ALLOYS

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Acta Metallurgica Sinica(English Letters) 1992年第6期5卷 443-448页

作者： hu Wei WANG Yanbin Chu WuYang XIAO Jimei university of science and technology beijing,china Associate Professor,Department of Materials Physics,university of science and technology beijing,beijing 100083,china beijing Univ of science and Technology Beijing China

The ductility loss and threshold stress intensity,K_(IH)during hydrogen charging were measured for pure Ni and four Ni-Fe fcc *** results show that ductility loss in 40Ni60Fe alloy and K_(IH)a 50Ni50Fe alloy have a minimum *** variations of the amounts of hydride, hydrogen evolution and dislocation structure with composition have been *** va- riation of hydrogen embrittlement susceptibility with composition measured by ductility loss and by K_(IH)or K_(IH)/K_C can be explained by means of the synthetical effects of amount of hydride,solutionized hydrogen and the extent of dislocation planarity on hydrogen embrittlement susceptibility.

关键词： Ni-Fe alloys hydrogen embrittlement

Sticking-up Behaviors and Surface Friction of IF Electrogalvanized Sheet Steel in Forming

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International Journal of Minerals,Metallurgy and Materials 1999年第1期13卷 61-63,68页

作者： Jiming hu Jixun Wu Yanping Lu Yanrong Zhu (Material science and Engineering School, university of science and technology beijing, beijing 100083, china) Univ of science and technology Beijing Beijing China

X-ray diffraction (XRD), ball-disc friction and wearing machine and draw-bead test were introduced to investigat the strcusture and workability of IF sheet steel electrogalvanized deposits prepared from sulphate solution system. It was shown that the picking-up of the zinc coating on die strengthened with the increasing of friction factor which was originally affected by the coating's structure. Duing forming, (00X) planes (X= 2, 4) preferential orientation of zinc deposits increased, which resulted in enhanc ing the coating's friction behaviors. Therefore, the forming mechanism of electrogalvedzed deposit was demonstrated that both friction and the stricking -up behaviors of the coating are intensified simultaneously and affect each other.

关键词： electrogalvanized deposit forming friction factor

Irradiation Damage of Oxide Dispersion Strengthened Ferritic Steel after Recrystallization

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International Journal of Minerals,Metallurgy and Materials 1998年第3期12卷 160-164页

作者： Benfu hu Shunmi Peng H Takahashi(Material science and Engineering School, university of science and technology beijing, beijing 100083, china)(faculty of Engineering, Hokkado university, Sapporo 060, Japan) Material science and Engineering School University of Science and Technology Beijing Beijing 100083 China faculty of Engineering Hokkado University Sapporo 060 Japan

The evolution of secondary defects and the characteristics of the void swelling of electrons irradiated Oxide Dispersion Strengthened Ferritic Steels (ODS steels) after recrystallization were studied. It was found that recrystallization increases the void swelling of ODS steel as compared with solution and injected He+ + D+ *** are two size ranges of voids formed in recrystallized ODS steel during irradiation, and bubbles can be preferential sites for the void formation. Polycrystal with low density of defects is formed, and sites where point defects disappear by irradiation decrease. This is the main reason for the increase of void swelling of ODS steel after recrystallization.

关键词： ODS steel recrystallization, electron irradiation

EFFECT OF NITROGEN ON MATRIX STRUCTURE OF GRAY CAST IRON

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Acta Metallurgica Sinica(English Letters) 1993年第6期6卷 370-372页

作者： ZHAI Qijie hu hanqi university of science and technology beijing,china associate professor,faculty of foundry,university of science and technology beijing,beijing 100083,china

Effect of nitrogen on matrix structure of 3 different varieties of gray cast iron,i.e., sub-eutectic Fe-C-Si,near-eutectic Fe-C-Si and Fe-C-Si-Mn,has been investigated. The eutectie colony structure of gray cast iron may be refined,the pearlite content increased and the micro-hardness of pearlite and ferrite raised with an addition of *** influ- ence of nitrogen on the transformation temperature of the equilibrium and non-equilibrium phases,as well as,the solution of nitrogen in ferrite and cementite seem to be the major rea- sons to strengthening the matrix structure of gray cast iron.

关键词： nitrogen gray cast iron matrix structure microhardness solid solution