CN112986527B - Method for representing transmission behavior in molten pool in double-roller casting and rolling process - Google Patents
Method for representing transmission behavior in molten pool in double-roller casting and rolling process Download PDFInfo
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- CN112986527B CN112986527B CN202110122637.8A CN202110122637A CN112986527B CN 112986527 B CN112986527 B CN 112986527B CN 202110122637 A CN202110122637 A CN 202110122637A CN 112986527 B CN112986527 B CN 112986527B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/20—Metals
- G01N33/205—Metals in liquid state, e.g. molten metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
- G01N23/225—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material using electron or ion
- G01N23/2251—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material using electron or ion using incident electron beams, e.g. scanning electron microscopy [SEM]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
- G01N23/227—Measuring photoelectric effect, e.g. photoelectron emission microscopy [PEEM]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N2013/003—Diffusion; diffusivity between liquids
Abstract
The invention provides a method for representing transmission behavior in a molten pool in a double-roll casting and rolling process, which comprises the following steps: continuously injecting liquid metal into the molten pool, and throwing a tracer substrate along the working surface of the crystallization roller, wherein the tracer substrate is used for releasing tracer particles forming a phase interface with the liquid metal in the molten pool; the crystallization roller is utilized to drive the tracer substrate to migrate to the solidification interface of the liquid metal; before the tracer substrate completely passes through the solidification interface, suddenly reducing the rotation speed of the crystallization roller to zero, stopping injecting liquid metal into a molten pool, quenching the liquid metal in the molten pool until solidification is carried out to form an ingot, and taking the ingot out of the molten pool; sectioning the ingot to form a cut surface exposing the tracer particles diffused into the interior of the ingot; and acquiring information about the transmission behavior of the cast-rolled metal in the molten pool by utilizing the diffusion condition of the trace particles in the cast ingot. Based on the transmission behavior information, the process parameters of the double-roller casting and rolling process can be conveniently adjusted by using a defect forming mechanism, so that the product quality can be improved, and the effect of efficiently optimizing the double-roller casting and rolling process can be achieved.
Description
Technical Field
The invention belongs to the field of twin-roll casting and rolling, and particularly relates to a method for representing transmission behavior in a molten pool in a twin-roll casting and rolling process.
Background
Twin roll casting is an important current method for producing thin metal strips, which has achieved great commercial success in both nonferrous metals and steel materials. The principle of the preparation process for the final purpose of solidification is that molten metal is injected into a molten pool surrounded by a counter-rotating crystallization roller and a side sealing plate through a flow distribution system, the side sealing plate is generally made of refractory materials, and water is introduced into the crystallization roller for cooling. The molten metal in the molten pool is cooled on the surface of the counter-rotating crystallization roller, the average cooling rate of the twin-roller casting is approximately 1000 ℃/s, so that the solidification speed is about 1000 times faster than that of the conventional process, the molten metal finally leaves the molten pool at the outlet of the molten pool after the rolling process at the bottom of the molten pool, a millimeter-level metal casting belt is formed, and the position of the molten metal converted into the solid metal casting belt is called the solidification interface of the molten metal in the twin-roller casting system. Compared with the conventional continuous casting and rolling technology, the double-roller casting and rolling technology has the advantages of remarkably low energy consumption and low emission, and is a green technology.
According to the prior art, most of the instability of the twin roll casting process is caused by the transfer behavior of uneven heat flow in the bath that performs the casting function. However, due to the unique construction of the twin roll casting and rolling equipment and the lack of experimental means, the molten pool realizing the casting and rolling function is like a 'black box', and although the twin roll casting and rolling has been proposed for 160 years so far, an accurate and visual method for characterizing the transmission behavior in the molten pool is not available internationally. The vast commercialization achieved at present is based on experience rather than on a strong theoretical knowledge. The method characterizes the transfer behavior in a molten pool in the double-roll casting and rolling process, and has very important significance for expanding the application field of the double-roll casting and rolling process, improving the process parameter control strategy and improving the cast strip quality.
Disclosure of Invention
The invention aims to provide a method for representing the transmission behavior in a molten pool in the double-roller casting and rolling process, so as to realize accurate and visual understanding of the transmission condition of liquid metal in the molten pool of a double-roller casting and rolling system, facilitate timely adjustment of the technological parameters of double-roller casting and rolling, optimize the casting and rolling effect of double-roller casting and rolling and improve the quality of cast strip.
According to one aspect of the present invention there is provided a method of characterising in-bath transfer behaviour in a twin roll casting process comprising the steps of: firstly, casting and rolling metal into a molten pool formed by two crystallization rollers and a side sealing plate in a surrounding mode, and adding a tracer agent along the working surface of at least one crystallization roller; step two, under the working state of the crystallization roller, the crystallization roller drives the tracer to migrate to the solidification interface of the cast-rolled metal, and during the period, the tracer diffuses to the cast-rolled metal; step three, when the preset time is reached, the rotating speed of the crystallization roller suddenly drops to zero, and meanwhile, the casting metal is stopped to be put into a molten pool, the casting metal in the molten pool is quickly cooled until solidification is carried out to form an ingot, and the ingot is taken out from the molten pool; step four, in the cast ingot, taking the direction of gradually narrowing the width of the cast ingot as the y axis of the cast ingot, and cutting the cast ingot along the y axis or the direction parallel to the y axis to form a section exposing the tracer diffused into the cast ingot; and fifthly, utilizing the distribution condition of the tracer in the cast ingot to represent the transmission behavior of the cast-rolled metal in the molten pool. By utilizing the method, the transmission behavior in the melting furnace in the double-roller casting and rolling process can be represented, the complex transmission mechanism in the cast strip defect forming process can be conveniently researched, the association relation between the double-roller casting and rolling process and the cast strip quality can be constructed, and the effect of the double-roller casting and rolling process can be optimized efficiently. During actual operation, the method of studying the distribution of the tracer in the ingot may be selected from, but not limited to, visual inspection, instrumental analysis. The proper tracer base material can be selected according to the actual application scene, the tracer base material needs to meet the requirement of releasing diffusible tracer particles into liquid metal to be cast and rolled, and the form of the tracer particles can be, but is not limited to, solid powder, powder wrapped by a shell, liquid drops and sol.
Preferably, during diffusion of the tracer into the metal being cast, a phase interface exists between the tracer and the metal being cast. Thereby, the diffusion behavior of the trace particles is facilitated to be observed.
Optionally, the tracer substrate is added before or after the crystallization roll is started.
Preferably, the tracer is a metallic material. The metal material has higher thermal stability, and the metal material is used as the tracer, so that the interference of the introduction of the tracer on the transmission behavior of the casting and rolling process, which is difficult to eliminate, is avoided.
Preferably, the melting point of the tracer is lower than the temperature in the melt pool; in the second step, the tracer diffuses in the form of droplets toward the metal being cast. Preferably, a material having a boiling point higher than the temperature of the liquid metal is selected as the tracer. Therefore, the tracer is not gasified in the molten pool all the time, so that too violent disturbance of gaseous substances to the slurry transmission in the molten pool is avoided, and the tracer diffusion condition is favorable for accurately reflecting the transmission behavior in the molten pool.
Preferably, in step one, the dosing operation is performed with the tracer in solid form. The solid material is convenient for feeding and positioning.
Preferably, in the first step, the tracer is dispensed on the working surface of the bonded crystallization roll.
Preferably, the tracer is fixed to the working surface of the crystallisation roller before the tracer enters the bath.
The tracer and the crystallization roller keep synchronous movement as far as possible, which is favorable for reducing the mass-energy exchange condition of the tracer on the working surface of the crystallization roller and accurately reflecting the transmission behavior in the molten pool.
Preferably, the solid tracer is in the form of a strip or tape.
Preferably, in step three, the two crystallization rolls are counter-rotated to remove the ingot.
Preferably, in the fourth step, the method further comprises a post-treatment operation on the cut surface, wherein the post-treatment operation comprises at least one of grinding, polishing and etching.
Drawings
FIG. 1 is a schematic diagram of a twin roll casting system;
FIG. 2 is a cross-sectional view of a wedge-shaped ingot produced in example 1;
FIG. 3 is a scanning electron microscope image of the bright silver region of the wedge-shaped ingot produced in example 1;
fig. 4 is a graph of the results of the spectral analysis of the region shown in fig. 3.
The correspondence of the reference numbers referred to in the following figures is as follows: 1. the metal to be cast and rolled, 2, tracer, 3, crystallization roller and 4, water gap.
Description of the preferred embodiments
In order that those skilled in the art will better understand the present invention, a technical solution of the embodiments of the present invention will be clearly and completely described below, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments.
Example 1
In the embodiment, pure aluminum is used as a cast-rolled metal 1 to carry out a double-roll casting and rolling test, the adopted casting and rolling equipment is a conventional double-roll casting and rolling machine, the double-roll casting and rolling machine comprises a control system, a flow distribution system, a crystallization roller 3 and side sealing plates, the crystallization roller 3 of the embodiment is made of steel, the diameter of the crystallization roller 3 is 160mm, the length of the roller is 200mm, the two crystallization rollers 3 and the side sealing plates are made of refractory materials, a molten pool is formed by encircling the two crystallization rollers 3 and the side sealing plates, and a water gap 4 of the flow distribution system is positioned above the molten pool, as shown in fig. 1. In addition, this embodiment uses solid metal pure copper in the form of a long strip as the tracer 2, the cross section of which is rectangular, and the thickness of which is 0.5mm. In other embodiments, the material used as the tracer 2 is not limited to solid elemental copper, and the cross section of the tracer 2 is not limited to square, e.g., circular, toothed, triangular, etc. cross section may be selected.
The aluminum substrate as the metal 1 to be cast and rolled is melted to be liquid, the superheat degree is controlled to be 15 ℃, the molten metal is injected into a molten pool through a water gap 4 of a flow distribution system, referring to fig. 1, solid metal copper as a tracing substrate is positioned on the central axis of the working surface of one of the crystallization rollers 3, the crystallization rollers 3 of a casting and rolling machine are started, the two crystallization rollers 3 rotate oppositely at the rotating speed of 5m/min, water is introduced into the interior for cooling, and then the liquid metal 1 to be cast and rolled is injected into the molten pool through a distribution system to start casting and rolling. At 20 seconds after the start of casting, the control system of the casting machine applies emergency braking to the crystallization roll 3, and at the same time, the injection of the cast-rolled metal 1 into the molten pool is stopped, and the molten metal in the molten pool is quenched by spraying water to cool the free liquid surface in the molten pool until a wedge-shaped ingot is formed. The two crystallising rolls 3 enclosing the bath are counter-rotated and gradually separated, so that the wedge-shaped ingot is removed from the bath. The width of the wedge-shaped ingot is gradually narrowed as the y-axis direction of the wedge-shaped ingot, the wedge-shaped ingot is cut along the y-axis direction, and the section of the wedge-shaped ingot is sequentially subjected to polishing, polishing and sodium hydroxide cleaning smoothing treatment, wherein the wedge-shaped ingot after the treatment is shown in fig. 2. As shown in fig. 2, it can be clearly seen that a bright silver area (indicated by the arrow in fig. 2) is formed on the right side of the wedge-shaped ingot.
It is assumed that the bright silver region at the section of the wedge-shaped ingot is formed by diffusion of the tracer 2 into the liquid aluminum located in the middle of the bath after entering the bath. The bright silver region was analyzed by a scanning electron microscope and a spectrometer, and as a result, as shown in fig. 3 and 4, based on the result of the spectroscopic analysis (fig. 4), it was possible to detect not only aluminum but also copper. This demonstrates that the tracer 2 moving in synchronization with the crystallization roller 3 diffuses in the cast metal 1 being cast during the above-described twin-roll casting, and that a clear bright silver area is formed inside the cast metal 1 in the molten pool due to the diffusion of the tracer 2. By observing the bright silver area, the two-phase area formed by the cast-rolled metal 1 at the bottom of the molten pool, the change trend of the rapid shearing layer on the surface of the crystallization roller 3 and the initial position of the rolling area in the casting and rolling process can be clearly seen. By analyzing the morphology of the liquid metal in the two-phase zone at the bottom of the bath, it can be found that under the current rolling process conditions, a large area of stagnant zone (corresponding to the bright silver zone) exists in the middle of the bath, the interface between the liquid metal and the fast moving layer on the surface of the crystallization roller 3 in this area undergoes momentum, mass and energy exchange, and the behavior of the interface determines the core quality of the cast strip.
The bottom end of the bright silver area is taken as a specific position (namely a rolling starting position) of a solidification interface, and the distance from the solidification interface to the top end of the wedge-shaped cast ingot is taken as the length of a rolling area in the casting and rolling process by determining the specific position of the solidification interface.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention.
Claims (6)
1. A method of characterizing transfer behavior in a molten bath during twin roll casting, comprising the steps of:
firstly, casting and rolling metal into a molten pool surrounded by two crystallization rollers and side sealing plates, and attaching at least one working surface of the crystallization rollers to a solid tracer, wherein the tracer is fixed on the working surface of the crystallization rollers before entering the molten pool, and the boiling point of the tracer is higher than the temperature of the molten pool;
step two, under the working state of the crystallization roller, the crystallization roller drives the tracer to migrate to the solidification interface of the cast-rolled metal, and during the period, the tracer diffuses to the cast-rolled metal;
step three, when the preset time is reached, the rotation speed of the crystallization roller suddenly drops to zero, and meanwhile, the casting metal is stopped to be put into the molten pool, the casting metal in the molten pool is quenched until solidification is carried out to form an ingot, and the ingot is taken out from the molten pool;
step four, in the cast ingot, taking the width gradually narrowing direction of the cast ingot as the y axis of the cast ingot, and cutting the cast ingot along the y axis or the direction parallel to the y axis so as to form a section exposing the tracer diffused into the cast ingot;
and fifthly, utilizing the distribution condition of the tracer in the cast ingot to represent the transmission behavior of the cast-rolled metal in the molten pool.
2. The method of characterizing in-bath transport behavior in a twin roll casting process of claim 1 wherein: during diffusion of the tracer into the cast metal, a phase interface exists between the tracer and the cast metal.
3. A method of characterizing in-bath transfer behavior in a twin roll casting process as defined in claim 2 wherein: the tracer is a metal material.
4. The method of characterizing in-bath transport behavior in a twin roll casting process of claim 1 wherein: the solid tracer is strip-shaped or strip-shaped.
5. The method of characterizing in-bath transport behavior in a twin roll casting process of claim 1 wherein: in the third step, the two crystallization rolls are reversely rotated to take out the ingot.
6. The method for characterizing in-bath transport behavior in a twin roll casting process as defined in any one of claims 1 to 5 wherein: in the fourth step, the method further comprises a post-treatment operation on the tangential plane, wherein the post-treatment operation comprises at least one of grinding, polishing and etching.
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| CN114034836A (en) * | 2021-11-03 | 2022-02-11 | 山东理工大学 | Method for measuring double-roller casting and rolling Kiss angle |
| CN114734008A (en) * | 2022-05-05 | 2022-07-12 | 山东理工大学 | Side sealing plate for enlarging effective volume of molten pool for double-roller casting and rolling |
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