Acta Metallurgica Sinica

Items from 1 to 20 out of 252 results

article

MECHANISM AND KINETICS OF TRANSFORMATION OF ALUMINA INCLUSIONS BY CALCIUM TREATMENT

Z.J. Han, L. Liu, M. Lind, L. Holappa

Acta Metallurgica Sinica > 2006 > 19 > 1 > 1-8

The basic mechanism and kinetics of the transformation process of alumina inclusions in steel was reported when calcium introduced into the steel by wire feeding or powder injection. To clarify the mechanisms model, experiments were performed by studying reactions between Al ₂ O ₃ and CaO in a laboratory furnace and by performing calcium treatments in an 8kg induction furnace for Al...

article

INVESTIGATION ON HOT DUCTILITY AND STRENGTH OF CONTINUOUS CASTING SLAB FOR AH32 STEEL

G.Y. Li, X.F. Li, L.G. Ao

Acta Metallurgica Sinica > 2006 > 19 > 1 > 75-78

By means of Gleeble-1500 testing machine, the simulation of continuous casting process for AH32 steel was carried out and hot ductility and strength were determined. The cracking sensitivity was studied under the different temperatures and strain rates. The Precipitations of AIN at different temperatures and the fractures of high-temperature tensile samples were observed by using TEM (transmission...

article

MICROSTRUCTURAL EVOLUTION OF HIGHLY UNDERCOOLED EUTECTIC Ni78.6Si21.4 ALLOY

Y.P. Lu, G.C. Yang, C.L. Yang, H.P. Wang, more

Acta Metallurgica Sinica > 2006 > 19 > 1 > 43-50

A large undercooling level up to 550K (0.386T _E ) was achieved in eutectic Ni _78.6 Si _21.4 melt by the combination of molten-glass and cyclic superheating. A microcrystalline structure is obtained at large undercooling. Surprisingly, the morphology of α(Ni) phase transits from the non-faceted phase to faceted phase at large undercooling of 390K. Based on the classical nucleation...

article

DEGRADATION BEHAVIORS OF NEW TYPE TiV-BASED HYDROGEN STORAGE ELECTRODE ALLOYS

X.Z. Sun, Y.F. Zhu, Y. Lin, R. Li, more

Acta Metallurgica Sinica > 2006 > 19 > 1 > 68-74

The degradation behaviors of the TiV-based multiphase hydrogen storage alloy Ti _0.8 Zr _0.2 V _3.2 Mn _0.64 -Cr _0.96 Ni _1.2 during electrochemical cycling in alkaline electrolyte have been studied by XRD, SEM, EIS and AES measurements. XRD analysis indicates that the alloy consists of a C14-type Laves phase and a V-based solid solution. The lattice parameters...

article

EFFECT OF CHLORIDE ON THE ATMOSPHERIC CORROSION OF SIMULATED ARTIFACT IRON IN NO3− BEARING POLLUTANT ENVIRONMENT

X. Cao, C.C. Xu

Acta Metallurgica Sinica > 2006 > 19 > 1 > 34-42

The effect of chloride in nitrogen-bearing pollutant on the atmospheric corrosion of cast iron was investigated by using periodic wet-dry test, electrochemical experiment and surface tension test. Scanning electron microscopy (SEM) with energy disperse atomic X-ray (EDAX) was used to identify the corrosion processes and products. The results of the weight loss measurement showed that the whole corrosion...

article

MICROSTRUCTURE AND MECHANICAL PROPERTY DEVELOPMENT IN THE SIMULATED HEAT AFFECTED ZONE OF V TREATED HSLA STEELS

Y.T. Chen, A.M. Guo, L.X. Wu, J. Zeng, more

Acta Metallurgica Sinica > 2006 > 19 > 1 > 57-67

The simulated heat affected zone (HAZ) of the high strength low alloy (HSLA) steels containing 0%, 0.047%, 0.097% and 0.151% vanadium, respectively, were studied with Gleeble-2000 thermomechanical simulator to determine the influence of vanadium addition on the mechanical properties of the HAZ. The HAZ simulation involved reheating the samples to 1350°C, and then cooling to ambient temperature at...

article

A NEURAL NETWORK FOR WELD PENETRATION CONTROL IN GAS TUNGSTEN ARC WELDING

C.S. Wu, J.Q. Gao, Y.H. Zhao

Acta Metallurgica Sinica > 2006 > 19 > 1 > 27-33

Realizing of weld penetration control in gas tungsten arc welding requires establishment of a model describing the relationship between the front-side geometrical parameters of weld pool and the back-side weld width with sufficient accuracy. A neural network model is developed to attain this aim. Welding experiments are conducted to obtain the training data set (including 973 groups of geometrical...

article

INFLUENCES OF EDGING ROLL SHAPE ON THE PLASTIC STRAIN DISTRIBUTION OF SLAB DURING MULTI-PASS V-H ROLLING PROCESS

H.L. Yu, X.H. Liu, C.S. Li, X.M. Zhao, more

Acta Metallurgica Sinica > 2006 > 19 > 1 > 51-56

Multi-pass slab vertical-horizontal (V-H) rolling process with variable edging roll shape have been simulated with explicit dynamic finite element method and updating geometric method. The distributions of plastic strain contour in slab during rolling process with different edging roll and under different rolling stage have been obtained. The results show that there exist two thin strain assembling...

article

EMBRITTLEMENT OF A Cr-Mo LOW-ALLOY STEEL DUE TO LOW-TEMPERATURE NEUTRON IRRADIATION

S.H. Song, L.Q. Weng

Acta Metallurgica Sinica > 2006 > 19 > 1 > 20-26

Embrittlement of a 2.25CrlMo steel stemming from neutron irradiation at 270°C is studied by virtue of small punch testing in conjunction with scanning electron microscopy. The ductile-brittle transition temperature determined by the small punch test is much lower than that determined by the standard Charpy test. There is some irradiation-induced embrittlement effect after the steel is irradiated for...

article

EFFECT OF TOOL WEAR ON MICROSTRUCTURE, MECHANICAL PROPERTIES AND ACOUSTIC EMISSION OF FRICTION STIR WELDED 6061 Al ALLOY

W.M. Zeng, H.L. Wu, J. Zhang

Acta Metallurgica Sinica > 2006 > 19 > 1 > 9-19

Tool condition is one of the main concerns in friction stir welding (FSW), because the geometrical condition of the tool pin including size and shape is strongly connected to the microstructure and mechanical performance of the weld. Tool wear occurs during FSW, especially for welding metal matrix composites with large amounts of abrasive particles, and high melting point materials, which significantly...

article

MESHFREE METHOD BASED ON POINT COLLOCATION FOR METAL FORMING SIMULATION

H.Y. Wen, X.H. Dong, X.Y. Ruan

Acta Metallurgica Sinica > 2006 > 19 > 2 > 79-84

A meshfree method based on reproducing kernel approximation and point collocation is presented for analysis of metal ring compression. The point collocation method is a true meshfree method without the employment of a background mesh. It is shown that, in a point collocation approach, the remesh problem because of the mesh distortion in FEM (finite element method) and the low efficiency in Galerkin-based...

article

PREPARATION OF TEM THIN FOIL CONTAINING POWDER PARTICLE BY ELECTRODEPOSITION METHOD

S.J. Yan, W.H. Tian, L. Qi

Acta Metallurgica Sinica > 2006 > 19 > 2 > 98-104

A practical technique to prepare transmission electron microscopy (TEM) thin foil containing powder particle was described and the data for the codeposition of two type particles with copper in the electroplating were presented. By depositing the particles which were distributed in CuSO ₄ electrolyte on cathode together with Cu ²⁺ in electrodeposition bath, composite coating with suitable...

article

A NEW PROCESS FOR PRODUCING HIGH GRADE GRAPHITE FOR USE IN MANUFACTURING Mg-C BRICKS IN STEEL MAKING

Y.Z. Lan, S. Zhang, G.Y. Wu, Q.R. Tang

Acta Metallurgica Sinica > 2006 > 19 > 2 > 139-143

Based on the characteristics of graphite ore from Panzhihua district, the present research tried to find a new technology to increase the purity of the graphite carbon from 93% to 97%. Study was conducted on leaching agents, time, temperature, stirring speed and concentration of leaching solution affecting the process. The technological parameters chosen were: L/S=3:1, reaction time 30min, 5% concentration...

article

INFLUENCE OF TEMPERATURE AND PRESSURE ON THE KINETICS OF Mg-6mol%LaNi PREPARED BY HYDRIDING COMBUSTION SYNTHESIS

Q. Li, K.C. Chou, K.D. Xu, L.J. Jiang, more

Acta Metallurgica Sinica > 2006 > 19 > 2 > 124-132

A new model to study the hydriding/dehydriding (H/D) kinetic mechanism has been applied in the two-phase (α-β) region of the Mg-6mol%LaNi composite at temperature and pressure ranging from 523 to 623K and 0.256 to 0.992MPa H ₂ , respectively. The coincidence of the theoretical calculation with the experimental data indicates that the rate-limiting step is hydrogen diffusion in the β phase...

article

DECREASING PITTING SUSCEPTIBILITY OF PASSIVE FILMS ON X70 PIPELINE STEEL IN NaCl SOLUTIONS BY ILLUMINATION

W.C. Zhu, W.H. Leng, J.Q. Zhang, C.N. Cao

Acta Metallurgica Sinica > 2006 > 19 > 2 > 91-97

The influence of UV illumination on passivity and pitting susceptibility on ×70 pipeline steel in a borate buffer (pH = 8.4) solution containing NaCl is described. It is observed that illumination of the sample leads to a decrease in its pitting susceptibility as indicated by pitting potential and incubation time measurements in chloride containing electrolytes. This effect is strongly dependent on...

article

COUPLED SIMULATION OF 3D ELECTRO-MAGNETO-FLOW FIELD IN HALL-HEROULT CELLS USING FINITE ELEMENT METHOD

J. Li, W. Liu, Y.Q. Lai, Q.Y. Li, more

Acta Metallurgica Sinica > 2006 > 19 > 2 > 105-116

Two full 3D steady mathematical models are developed by finite element method (FEM) to calculate coupled physics fields: the electro-magnetic model is built and solved first and so is the fluid motion model with the acquired electromagnetic force as source body forces in Navier-Stokes equations. Effects caused by the ferromagnetic shell, busbar system around, and open boundary problem as well as inside...

article

PREPARATION AND CORROSION RESISTANCE OF NiP/TiO2 COMPOSITE FILM ON CARBON STEEL IN SULFURIC ACID SOLUTION

L.Z. Song, S.Z. Song, J. Zhao

Acta Metallurgica Sinica > 2006 > 19 > 2 > 117-123

A NiP/TiO ₂ composite film on carbon steel was prepared by electroless plating and sol-gel composite process. An artificial neural network was applied to optimize the prepared condition of the composite film. Corrosion behavior of the NiP/TiO ₂ composite film was investigated by polarization resistance measurement, anode polarization, ESEM (environmental scanning electron microscopy)...

article

IMPROVING THE SURFACE PROPERTY OF TC4 ALLOY BY LASER NITRIDING AND ITS MECHANISM

Y.L. Yang, G.J. Zhao, D. Zhang, C.S. Liu

Acta Metallurgica Sinica > 2006 > 19 > 2 > 151-156

The mixing technology of laser and heated nitrogen was applied to improve the surface hardness of titanium alloy (TC4). The samples were nitrided with laser power density of 6.5×10 ⁵ W·cm ⁻² , the scanning speed various from 100 to 500mm·min ⁻¹ . The nitrogen gas was pre-heated to 300°C to accelerate the nitriding process. Some interested samples were tested with XRD method...

article

HOT DEFORMATION AND MARTENSITIC TRANSFORMATION BEHAVIORS OF Fe-32%Ni ALLOY

J. Huang, Z. Xu

Acta Metallurgica Sinica > 2006 > 19 > 2 > 133-138

The Hot deformation and martensitic transformation behaviors of Fe-32%Ni alloy was investigated by measurements of electrical resistance and X-ray diffraction. With the increase in strain, the austenite goes through from the work-hardened to the partial dynamically re-crystallized and then to the completed dynamically re-crystallized. The martensitic transformation characteristics depend on the austenite...

article

NUMERICAL INVESTIGATION OF STRAIGHT-LINE LASER FORMING UNDER THE TEMPERATURE GRADIENT MECHANISM

Y.J. Shi, H. Shen, Z.Q. Yao, J. Hu

Acta Metallurgica Sinica > 2006 > 19 > 2 > 144-150

Laser forming is a new flexible and dieless forming technique. To achieve the high accuracy forming, the temperature gradient mechanism (TGM) is studied. In the analysis of TGM, the plate bends about x-axis and about y-axis as well. To understand the deformation trend, the numerical simulation of deformation of plate is conducted by choosing different laser powers, laser spot diameters, scanning speeds,...

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Keywords

NUMERICAL SIMULATION (16)
MICROSTRUCTURE (13)
MECHANICAL PROPERTY (8)
CORROSION RESISTANCE (7)
ELECTRODEPOSITION (6)
MAGNESIUM ALLOY (6)
TEMPERATURE FIELD (6)
CORROSION (5)
KINETICS (5)
MECHANICAL PROPERTIES (5)
DEFORMATION (4)
DIRECTIONAL SOLIDIFICATION (4)
PRECIPITATION (4)
RECRYSTALLIZATION (4)
SIMULATION (4)
AL-SI ALLOY (3)
ALUMINUM ALLOY (3)
FINITE ELEMENT ANALYSIS (3)
FINITE ELEMENT METHOD (3)
FINITE ELEMENT METHOD (FEM) (3)
FRASTA (FRACTURE-SURFACE TOPOGRAPHY ANALYSIS) (3)
INTERMETALLIC COMPOUND (3)
INTERMETALLICS (3)
MAGNESIUM ALLOYS (3)
MICROSTRUCTURE EVOLUTION (3)
MODELING (3)
RECIPROCATING EXTRUSION (3)
SEMI-SOLID (3)
STEEL (3)
TEXTURE (3)
X70 STEEL (3)
A356 ALLOY (2)
AB INITIO CALCULATION (2)
ACTIVATION ENERGY (2)
AGING (2)
ALUMINIUM ALLOY (2)
ALUMINUM ELECTROLYSIS (2)
BAINITE TRANSFORMATION (2)
COLD ROLLING (2)
CONTINUOUS CASTING (2)
CREEP (2)
DAMPING CAPACITY (2)
DENSITY (2)
DYNAMIC RECRYSTALLIZATION (2)
ELECTROMAGNETIC VIBRATION (2)
ELECTRONIC STRUCTURE (2)
FERRITE TRANSFORMATION (2)
FINITE ELEMENT (2)
FLOW STRESS (2)
GROWTH (2)
HEAT TREATMENT (2)
HOT DEFORMATION (2)
ICOSAHEDRAL QUASICRYSTAL (2)
IN718 ALLOY (2)
INCLUSION (2)
INERT ANODE (2)
INTERNAL FRICTION (2)
ISOTHERMAL SECTION (2)
J-INTEGRAL (2)
LASER CLADDING (2)
LASER POWER (2)
MACROSEGREGATION (2)
MAGNESIUM (2)
MAGNETIC PROPERTIES (2)
MAGNETIC PROPERTY (2)
MAGNETISM (2)
MAGNETOCALORIC EFFECT (2)
MAGNETORESISTANCE (2)
MARTENSITIC TRANSFORMATION (2)
MATHEMATICAL MODEL (2)
MICROALLOYED STEEL (2)
NANOSTRUCTURE (2)
PERMEABILITY (2)
POWDER METALLURGY (2)
PRECIPITATE (2)
RAPID SOLIDIFICATION (2)
RESIDUAL STRESS (2)
SECOND-PHASE PARTICLE (2)
SI (2)
SILICON (2)
SOLIDIFICATION (2)
SPECIFIC SATURATION MAGNETIZATION (2)
SUPERALLOY (2)
SURFACE QUALITY (2)
TEMPERATURE (2)
TENSILE PROPERTY (2)
THERMAL STRESS (2)
THERMODYNAMICS (2)
TI-6AL-4V ALLOY (2)
TITANIUM (2)
TRANSFORMATION (2)
TUBE (2)
TWIN-ROLL STRIP CASTING (2)
VALENCE BOND STRUCTURE (2)
WETTABILITY (2)
ZIRCONIUM (2)
ZN COATING (2)
(001) ORIENTATION (1)
0CR18NI10TI (1)
16MNR STEEL (1)
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Acta Metallurgica Sinica

MECHANISM AND KINETICS OF TRANSFORMATION OF ALUMINA INCLUSIONS BY CALCIUM TREATMENT

INVESTIGATION ON HOT DUCTILITY AND STRENGTH OF CONTINUOUS CASTING SLAB FOR AH32 STEEL

MICROSTRUCTURAL EVOLUTION OF HIGHLY UNDERCOOLED EUTECTIC Ni78.6Si21.4 ALLOY

DEGRADATION BEHAVIORS OF NEW TYPE TiV-BASED HYDROGEN STORAGE ELECTRODE ALLOYS

EFFECT OF CHLORIDE ON THE ATMOSPHERIC CORROSION OF SIMULATED ARTIFACT IRON IN NO3− BEARING POLLUTANT ENVIRONMENT

MICROSTRUCTURE AND MECHANICAL PROPERTY DEVELOPMENT IN THE SIMULATED HEAT AFFECTED ZONE OF V TREATED HSLA STEELS

A NEURAL NETWORK FOR WELD PENETRATION CONTROL IN GAS TUNGSTEN ARC WELDING

INFLUENCES OF EDGING ROLL SHAPE ON THE PLASTIC STRAIN DISTRIBUTION OF SLAB DURING MULTI-PASS V-H ROLLING PROCESS

EMBRITTLEMENT OF A Cr-Mo LOW-ALLOY STEEL DUE TO LOW-TEMPERATURE NEUTRON IRRADIATION

EFFECT OF TOOL WEAR ON MICROSTRUCTURE, MECHANICAL PROPERTIES AND ACOUSTIC EMISSION OF FRICTION STIR WELDED 6061 Al ALLOY

MESHFREE METHOD BASED ON POINT COLLOCATION FOR METAL FORMING SIMULATION

PREPARATION OF TEM THIN FOIL CONTAINING POWDER PARTICLE BY ELECTRODEPOSITION METHOD

A NEW PROCESS FOR PRODUCING HIGH GRADE GRAPHITE FOR USE IN MANUFACTURING Mg-C BRICKS IN STEEL MAKING

INFLUENCE OF TEMPERATURE AND PRESSURE ON THE KINETICS OF Mg-6mol%LaNi PREPARED BY HYDRIDING COMBUSTION SYNTHESIS

DECREASING PITTING SUSCEPTIBILITY OF PASSIVE FILMS ON X70 PIPELINE STEEL IN NaCl SOLUTIONS BY ILLUMINATION

COUPLED SIMULATION OF 3D ELECTRO-MAGNETO-FLOW FIELD IN HALL-HEROULT CELLS USING FINITE ELEMENT METHOD

PREPARATION AND CORROSION RESISTANCE OF NiP/TiO2 COMPOSITE FILM ON CARBON STEEL IN SULFURIC ACID SOLUTION

IMPROVING THE SURFACE PROPERTY OF TC4 ALLOY BY LASER NITRIDING AND ITS MECHANISM

HOT DEFORMATION AND MARTENSITIC TRANSFORMATION BEHAVIORS OF Fe-32%Ni ALLOY

NUMERICAL INVESTIGATION OF STRAIGHT-LINE LASER FORMING UNDER THE TEMPERATURE GRADIENT MECHANISM

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