Abstract: The finite element model of coupling the thermal field with structural analysis is proposed
in order to analyze the thermo-stress of casting ladle structure. The thermal fields of casting ladle with
refractory lining structure are computed according to the thermal properties of materials and
boundary conditions. Numerical simulation shows that that computed outer temperatures of casting
ladle agree with measured ones. The thermo-stress of casting ladle structure is simulated by taking
thermal loadings as the loading conditions of the steel shell structure. Material behaviors were
described by the Drucker–Prager plasticity model and Von Mises yield criterion. Calculation results
of thermo-stress fields shows the outer shell structure is safety under the action of thermal loadings.
Abstract: In the process of the continuous straightening during continuous casting, elevated
temperature creep and stress relaxation are remarkable. During continuous straightening, temperature
of steel billet is very high, where the characteristic of deformation is low strain and low strain rate.
Experiments of elevated temperature creep, stress relaxation and elevated tension under the
conditions of continuous straightening were carried on Gleeble3500 thermal-mechanical simulation
machine and the results indicate that both the creep speed and the stress relaxation speed are very fast
in the conditions of continuous straightening. Then metallurgical structures were observed. A lead
plate was used to simulate the billet during continuous straightening and then straightening forces
were measured. An elasto-viscoplastic model and an elasto-plastic model were built according to the
experiment to calculate the straightening forces. The contrast between the calculation results and the
measured data shows that ignoring the creep and stress relaxation will result in great errors when
calculating the straightening forces in continuous straightening. Carrying researches on elevated
temperature creep and stress relaxation and using their characteristics in design has great importance
to improve the quality and quantity of billets in the process of continuous casting.
Abstract: The heat transfer during the casting solidification process includes: the heat radiation of the
high temperature casting and the mold, the heat convection between the casting and the mold, and the
heat conduction in the casting and the casting to the mold. In this paper, a formula of time step in
simulation of solidification is derived, considering the heat radiation, convection and conduction based
on the conservation of energy. The different heat transfer condition between the ordinary sand casting
and the permanent mold casting is taken into account in this formula. The characteristic of heat
transfer in the interior and surface of the casting is also considered.
The numerical experiments show that this formula can avoid radiation of the computation, and
can improve the computational efficiency about 20% in the simulation of solidification process.
Abstract: The numerical solidification simulation for oceangoing freighter rudder horn steel casting
has been made and the location and reasons forming casting defects have been predicted by
HUAZHU CAE software. Simulating result shows that the casting perfects can be realized by means
of the technological optimization and rationally assembling gating system, risers and iron chill. After
magnetic particle detection and ultrasonic inspection, the properties and microstructure of the
oceangoing freighter rudder horn steel casting are in accord with the standard of USA, Germany and
Abstract: In the present work, rapidly solidified alloys strips with Al-0.24Ti and Al-21Si-0.24Ti(in
wt.%) were prepared by single roller melt-spinning method. The microstructures, phase and
morphology characteristics of the resultant strips were characterized by means of scanning electron
microscopy (SEM),transmission electric microscopy (TEM) and XRD technique. The results show
that the grains have been refined after rapid solidification processing, and the micro-nanocrystalline
grain are formed. The morphology characteristics can be changed. The microstructures of Al-0.24Ti
alloys strip are micro-nanostructure α-Al solid solutions which are similar with granular or nodular,
the corresponding SAD pattern is rings, it presents characteristic of polycrystal; Compared with
equilibrium solidification, the microstructures of hypereutectic Al-Si alloy are changed obviously.
They are composed of primary micro-nanostructure α-Al supersaturated solid solution and
nanocrystal granular (α+Si) eutectic which set in the supersaturated solid solution. The nucleation and
growth of primary silicon are suppressed and primary silicon can not precipitate, meanwhile, α-Al
phase is nucleated which prior to eutectic, therefore the microstructures become into the metastable
state. The mechanism of the formation for microstructures of melt-spinning alloys has also been
Abstract: Base on the coupled three-dimensional model of flow temperature and apparent viscosity
on semisolid materials, the mould filling processes of liquid and semisolid magnesium alloys have
been analyzed. The simulation results showed that the semisolid mould filling with the characteristic
of pseudo-plasticity and Bingham type is steady and the air entrapment is much smaller than that of
liquid die casting. Therefore, the semisolid die casting can prevent from those defects produced by
the traditional die casting, which offer a new technology for lower interior defects and better quality.
Abstract: Compared with traditional blazing furnace, the Continuous Casting-Direct Rolling is an
advanced manufacturing steel technology, which can reduce energy waste, decrease pollution and
enhance efficiency. The characteristics of steels during induction heating are complex, the change
of material properties with temperature makes exact analysis methods very difficult to implement.
Therefore, a powerful computer aided numerical tool (i.e., finite difference analysis) is selected to
numerically model the induction heating process in this paper.
The mathematic model coupling with electromagnetic field and thermal field was established,
and it was solved by finite difference method (FDM), thus the slab temperature distribution and its
variation with time were obtained, and the characteristics in whole induction heating process were
studied. To validate the program feasible, the results were evaluated and compared with experiment
results, which showed that the simulation results are reliable and effective.
The skin effect in heating process from the two results was studied and demonstrated, the
temperature change caused by different parameters such as the induced power intensity and the
corner radian were also presented, which indicate that the slab temperature can be heated uniformly
through adjusting these parameters, thus the continuous casting slab can meet the rolling
Abstract: Level Set Method is an appropriate mathematical tool for solving two-phase flow
problems. The main advantage of Level Set Method is its efficiency to deal with complex
interfaces, even if topology changes. In this paper, the liquid-gas two-phase flow is simulated using
a combination of Level Set Method and SOLA method. SOLA is used to compute the
Navier-Stokes equation, and Level Set Method is used to track the interfaces between the liquid and
the gas during mold filling process.
The difficulty in the simulation of two-phase flow comes from great change of physical
parameters (e.g., density and viscosity) across the interfaces. Level Set Method allows for large
density ratio and jump in viscosity without reconstructing the numerical grid. In this work, the
forming and moving of the gas bubbles in liquid were numerically simulated by Level Set approach.
The numerical simulation results and experiments suggest that Level Set Method is quite
reliable and effective for the simulation of liquid-gas two-phase flow during mold filling.